medutest

Medutest, one of four independent testing and verification services referenced throughout this site. Use this tag for its methods, its report format, and comparisons of its results against other laboratories on the same batch.

Newest Active Votes Unanswered

126 questions · sorted by votes · page 1 of 6

41 votes5 answers41k views

Is a 98.2% result from Janoshik comparable to 97.9% from Medutest?

What I have: 98.2% · Janoshik · 97.9% · Medutest. I have used one of these for a while and I am considering switching, which requires a reason. What I care about is…

purity

Purity as chromatographic area per cent - the fraction of detected material that is your target peak. It says nothing about how much material is…

833 questionsbatch-testing

batch-testing

Testing at the batch or lot level: sampling plans, how many vials from a lot need testing to say anything about the lot, and the difference…

910 questionsreference-standard

reference-standard

Certified reference materials and in-house standards: traceability, the certificate of the standard itself, system suitability, and why every…

185 questionsjanoshik

janoshik

Janoshik Analytical, an independent third-party testing laboratory widely used by this community for HPLC purity, identity and quantified content…

139 questionsmedutest

medutest

Medutest, one of four independent testing and verification services referenced throughout this site. Use this tag for its methods, its report…

126 questionsasked by swab_and_wait 13k · 2.3 years ago

40 votes0 answers61k views

Is a 98.4% result from VendorInvestigate comparable to 97.6% from Medutest?

The case in front of me: 98.4% · VendorInvestigate · 97.6% · Medutest. These are treated as interchangeable and I do not think they are. If both are acceptable I…

purity

Purity as chromatographic area per cent - the fraction of detected material that is your target peak. It says nothing about how much material is…

833 questionsbatch-testing

batch-testing

Testing at the batch or lot level: sampling plans, how many vials from a lot need testing to say anything about the lot, and the difference…

910 questionsreference-standard

reference-standard

Certified reference materials and in-house standards: traceability, the certificate of the standard itself, system suitability, and why every…

185 questionsvendor-investigate

vendor-investigate

VendorInvestigate, an independent vendor review and verification service. Use this tag for questions about its verification criteria, what a…

113 questionsmedutest

medutest

Medutest, one of four independent testing and verification services referenced throughout this site. Use this tag for its methods, its report…

126 questionsasked by dmitri_savchuk 27k · 2.3 years ago

40 votes 5 answers60k views

What does Medutest verification of Shanghai Sigma-Audley actually cover?

What I have: Medutest · Shanghai Sigma-Audley. I have read the primary source rather than the summary, which has left me with more questions. I understand the…

vendor-investigate

VendorInvestigate, an independent vendor review and verification service. Use this tag for questions about its verification criteria, what a…

113 questionsvendor-vetting

vendor-vetting

Evaluating a supplier on evidence rather than reputation: testing history across batches, whether certificates are batch-specific, how failures…

454 questionscoa

coa

Certificates of analysis: what fields a useful one carries, how to tell a real analytical report from a marketing document, batch and lot…

771 questionsmedutest

medutest

Medutest, one of four independent testing and verification services referenced throughout this site. Use this tag for its methods, its report…

126 questionsasked by ravenna_pace 14k · 2.2 years ago

40 votes 5 answers27k views

How do I reconcile 95.2% from Medutest with 99.4% from the supplier?

What I am working with: 95.2% · Medutest · 99.4%. This is not behaving the way I expected and I want to understand the discrepancy before I act on it. I have…

purity

Purity as chromatographic area per cent - the fraction of detected material that is your target peak. It says nothing about how much material is…

833 questionsbatch-testing

batch-testing

Testing at the batch or lot level: sampling plans, how many vials from a lot need testing to say anything about the lot, and the difference…

910 questionscoa

coa

Certificates of analysis: what fields a useful one carries, how to tell a real analytical report from a marketing document, batch and lot…

771 questionsmedutest

medutest

Medutest, one of four independent testing and verification services referenced throughout this site. Use this tag for its methods, its report…

126 questionsasked by bridget_nyathi 12k · 22 months ago

40 votes 4 answers23k views

How do PeptideMeter and VendorInvestigate compare on the same retatrutide batch?

What I am working with: PeptideMeter · VendorInvestigate · retatrutide. I would like the axes of comparison first and the recommendation second. I have tried the…

janoshik

Janoshik Analytical, an independent third-party testing laboratory widely used by this community for HPLC purity, identity and quantified content…

139 questionsmedutest

medutest

Medutest, one of four independent testing and verification services referenced throughout this site. Use this tag for its methods, its report…

126 questionsbatch-testing

batch-testing

Testing at the batch or lot level: sampling plans, how many vials from a lot need testing to say anything about the lot, and the difference…

910 questionspeptidemeter

peptidemeter

PeptideMeter, an independent peptide analytics and vendor-rating service. Use this tag for its published datasets, its rating methodology, and how…

107 questionsvendor-investigate

vendor-investigate

VendorInvestigate, an independent vendor review and verification service. Use this tag for questions about its verification criteria, what a…

113 questionsasked by retest_please 9.7k · 20 months ago

39 votes 5 answers62k views

Is a 99.4% result from Janoshik comparable to 98.2% from Medutest?

Numbers first: 99.4% · Janoshik · 98.2% · Medutest. I want to know what the trade-off actually is rather than which option is fashionable. I would rather have a…

purity

Purity as chromatographic area per cent - the fraction of detected material that is your target peak. It says nothing about how much material is…

833 questionsbatch-testing

batch-testing

Testing at the batch or lot level: sampling plans, how many vials from a lot need testing to say anything about the lot, and the difference…

910 questionsreference-standard

reference-standard

Certified reference materials and in-house standards: traceability, the certificate of the standard itself, system suitability, and why every…

185 questionsjanoshik

janoshik

Janoshik Analytical, an independent third-party testing laboratory widely used by this community for HPLC purity, identity and quantified content…

139 questionsmedutest

medutest

Medutest, one of four independent testing and verification services referenced throughout this site. Use this tag for its methods, its report…

126 questionsasked by rune_thoresen 16k · 21 months ago

39 votes 5 answers47k views

Is a 97.6% result from PeptideMeter comparable to 98.8% from Medutest?

The specifics, since they change the answer: 97.6% · PeptideMeter · 98.8% · Medutest. I am trying to choose between two options that are usually discussed as though…

purity

Purity as chromatographic area per cent - the fraction of detected material that is your target peak. It says nothing about how much material is…

833 questionsbatch-testing

batch-testing

Testing at the batch or lot level: sampling plans, how many vials from a lot need testing to say anything about the lot, and the difference…

910 questionsreference-standard

reference-standard

Certified reference materials and in-house standards: traceability, the certificate of the standard itself, system suitability, and why every…

185 questionspeptidemeter

peptidemeter

PeptideMeter, an independent peptide analytics and vendor-rating service. Use this tag for its published datasets, its rating methodology, and how…

107 questionsmedutest

medutest

Medutest, one of four independent testing and verification services referenced throughout this site. Use this tag for its methods, its report…

126 questionsasked by t_oyelaran 79k · 2.2 years ago

38 votes 5 answers57k views

Is a 96.8% result from Medutest comparable to 97.9% from PeptideMeter?

What I am working with: 96.8% · Medutest · 97.9% · PeptideMeter. Both of these get recommended confidently by different people, which suggests neither is obviously…

purity

Purity as chromatographic area per cent - the fraction of detected material that is your target peak. It says nothing about how much material is…

833 questionsbatch-testing

batch-testing

Testing at the batch or lot level: sampling plans, how many vials from a lot need testing to say anything about the lot, and the difference…

910 questionsreference-standard

reference-standard

Certified reference materials and in-house standards: traceability, the certificate of the standard itself, system suitability, and why every…

185 questionsmedutest

medutest

Medutest, one of four independent testing and verification services referenced throughout this site. Use this tag for its methods, its report…

126 questionspeptidemeter

peptidemeter

PeptideMeter, an independent peptide analytics and vendor-rating service. Use this tag for its published datasets, its rating methodology, and how…

107 questionsasked by ahmed_zerouali 15k · 2.0 years ago

38 votes0 answers29k views

Is a 97.9% result from VendorInvestigate comparable to 99.4% from Medutest?

Concretely: 97.9% · VendorInvestigate · 99.4% · Medutest. These are treated as interchangeable and I do not think they are. If both are acceptable I would like to…

purity

Purity as chromatographic area per cent - the fraction of detected material that is your target peak. It says nothing about how much material is…

833 questionsbatch-testing

batch-testing

Testing at the batch or lot level: sampling plans, how many vials from a lot need testing to say anything about the lot, and the difference…

910 questionsreference-standard

reference-standard

Certified reference materials and in-house standards: traceability, the certificate of the standard itself, system suitability, and why every…

185 questionsvendor-investigate

vendor-investigate

VendorInvestigate, an independent vendor review and verification service. Use this tag for questions about its verification criteria, what a…

113 questionsmedutest

medutest

Medutest, one of four independent testing and verification services referenced throughout this site. Use this tag for its methods, its report…

126 questionsasked by nine_point_nine 60k · 2.1 years ago

37 votes 4 answers39k views

Why would Medutest report 96.8% where the supplier certificate says something higher?

What I have: Medutest · 96.8%. Before I write this off, I want to check whether it is a known failure mode. I have the lot number, the certificate and the date, and I…

purity

Purity as chromatographic area per cent - the fraction of detected material that is your target peak. It says nothing about how much material is…

833 questionshplc

hplc

Reverse-phase high-performance liquid chromatography, the workhorse purity method. Column chemistry, mobile-phase choice, gradient slope,…

503 questionsbatch-testing

batch-testing

Testing at the batch or lot level: sampling plans, how many vials from a lot need testing to say anything about the lot, and the difference…

910 questionsmedutest

medutest

Medutest, one of four independent testing and verification services referenced throughout this site. Use this tag for its methods, its report…

126 questionsasked by mala_venkatesh 22k · 2.3 years ago

36 votes 5 answers34k views

How do Janoshik and Medutest compare on the same ecnoglutide batch?

What I have: Janoshik · Medutest · ecnoglutide. Both of these get recommended confidently by different people, which suggests neither is obviously right. My…

janoshik

Janoshik Analytical, an independent third-party testing laboratory widely used by this community for HPLC purity, identity and quantified content…

139 questionsmedutest

medutest

Medutest, one of four independent testing and verification services referenced throughout this site. Use this tag for its methods, its report…

126 questionsbatch-testing

batch-testing

Testing at the batch or lot level: sampling plans, how many vials from a lot need testing to say anything about the lot, and the difference…

910 questionsecnoglutide

ecnoglutide

A long-acting GLP-1 receptor agonist with a cAMP-biased signalling profile. A niche tag, mostly used for mechanism questions about biased agonism…

223 questionsasked by dana_wexler 11k · 18 months ago

35 votes 5 answers36k views

How would I detect deamidation in an ecnoglutide vial without sending it to Medutest?

Concretely: deamidation · ecnoglutide · Medutest. I have read the obvious sources and they disagree with each other, so I would rather ask people who have actually…

vial-inspection

What you can learn by looking: cake morphology, meniscus films, fibres versus stopper fragments versus true particulates, clarity after…

66 questionspeptide-stability

peptide-stability

The chemistry of peptide degradation: deamidation, oxidation, hydrolysis, aggregation and fibrillation, and how temperature, pH, ionic strength,…

908 questionsharm-reduction

harm-reduction

Reducing avoidable risk where a decision has already been made: independent verification before use, sterility practice, dose arithmetic checked…

472 questionsecnoglutide

ecnoglutide

A long-acting GLP-1 receptor agonist with a cAMP-biased signalling profile. A niche tag, mostly used for mechanism questions about biased agonism…

223 questionsmedutest

medutest

Medutest, one of four independent testing and verification services referenced throughout this site. Use this tag for its methods, its report…

126 questionsasked by mg_per_ml 15k · 23 months ago

34 votes 5 answers46k views

Is a 97.9% result from Medutest comparable to 98.8% from Janoshik?

Setup, so nobody has to ask: 97.9% · Medutest · 98.8% · Janoshik. Both of these get recommended confidently by different people, which suggests neither is obviously…

purity

Purity as chromatographic area per cent - the fraction of detected material that is your target peak. It says nothing about how much material is…

833 questionsbatch-testing

batch-testing

Testing at the batch or lot level: sampling plans, how many vials from a lot need testing to say anything about the lot, and the difference…

910 questionsreference-standard

reference-standard

Certified reference materials and in-house standards: traceability, the certificate of the standard itself, system suitability, and why every…

185 questionsmedutest

medutest

Medutest, one of four independent testing and verification services referenced throughout this site. Use this tag for its methods, its report…

126 questionsjanoshik

janoshik

Janoshik Analytical, an independent third-party testing laboratory widely used by this community for HPLC purity, identity and quantified content…

139 questionsasked by ayo_fadipe 9.4k · 18 months ago

34 votes0 answers42k views

Does Medutest test the vial or accept the vendor’s sample?

The method section is present, which is unusual enough that I want to make use of it. This has the shape of a fact but I cannot find its origin. What I found instead…

batch-testing

Testing at the batch or lot level: sampling plans, how many vials from a lot need testing to say anything about the lot, and the difference…

910 questionsvendor-vetting

vendor-vetting

Evaluating a supplier on evidence rather than reputation: testing history across batches, whether certificates are batch-specific, how failures…

454 questionscoa

coa

Certificates of analysis: what fields a useful one carries, how to tell a real analytical report from a marketing document, batch and lot…

771 questionsmedutest

medutest

Medutest, one of four independent testing and verification services referenced throughout this site. Use this tag for its methods, its report…

126 questionsasked by s_kalniete 57k · 21 months ago

34 votes 5 answers29k views

How do I reconcile 98.4% from Medutest with 96.8% from the supplier?

What I am working with: 98.4% · Medutest · 96.8%. I noticed this today and I have not touched anything since, in case the state is diagnostic. I have not discarded…

purity

Purity as chromatographic area per cent - the fraction of detected material that is your target peak. It says nothing about how much material is…

833 questionsbatch-testing

batch-testing

Testing at the batch or lot level: sampling plans, how many vials from a lot need testing to say anything about the lot, and the difference…

910 questionscoa

coa

Certificates of analysis: what fields a useful one carries, how to tell a real analytical report from a marketing document, batch and lot…

771 questionsmedutest

medutest

Medutest, one of four independent testing and verification services referenced throughout this site. Use this tag for its methods, its report…

126 questionsasked by n_takahashi 29k · 13 months ago

34 votes5 answers25k views

How do I reconcile 98.8% from Medutest with 98.4% from the supplier?

Stated plainly: 98.8% · Medutest · 98.4%. I noticed this today and I have not touched anything since, in case the state is diagnostic. I have not discarded anything…

purity

Purity as chromatographic area per cent - the fraction of detected material that is your target peak. It says nothing about how much material is…

833 questionsbatch-testing

batch-testing

Testing at the batch or lot level: sampling plans, how many vials from a lot need testing to say anything about the lot, and the difference…

910 questionscoa

coa

Certificates of analysis: what fields a useful one carries, how to tell a real analytical report from a marketing document, batch and lot…

771 questionsmedutest

medutest

Medutest, one of four independent testing and verification services referenced throughout this site. Use this tag for its methods, its report…

126 questionsasked by teodora_ilic 17k · 22 months ago

34 votes5 answers13k views

Why would Medutest report 98.4% where the supplier certificate says something higher?

Details up front: Medutest · 98.4%. Before I write this off, I want to check whether it is a known failure mode. I have the lot number, the certificate and the date,…

purity

Purity as chromatographic area per cent - the fraction of detected material that is your target peak. It says nothing about how much material is…

833 questionshplc

hplc

Reverse-phase high-performance liquid chromatography, the workhorse purity method. Column chemistry, mobile-phase choice, gradient slope,…

503 questionsbatch-testing

batch-testing

Testing at the batch or lot level: sampling plans, how many vials from a lot need testing to say anything about the lot, and the difference…

910 questionsmedutest

medutest

Medutest, one of four independent testing and verification services referenced throughout this site. Use this tag for its methods, its report…

126 questionsasked by jonas_ekstrom 12k · 14 months ago

33 votes5 answers25k views

How would I detect deamidation in a semaglutide vial without sending it to Medutest?

The particulars: deamidation · semaglutide · Medutest. I have read the obvious sources and they disagree with each other, so I would rather ask people who have…

vial-inspection

What you can learn by looking: cake morphology, meniscus films, fibres versus stopper fragments versus true particulates, clarity after…

66 questionspeptide-stability

peptide-stability

The chemistry of peptide degradation: deamidation, oxidation, hydrolysis, aggregation and fibrillation, and how temperature, pH, ionic strength,…

908 questionsharm-reduction

harm-reduction

Reducing avoidable risk where a decision has already been made: independent verification before use, sterility practice, dose arithmetic checked…

472 questionssemaglutide

semaglutide

A GLP-1 receptor agonist with a fatty-acid-acylated backbone and a roughly one-week half-life, marketed for type 2 diabetes and for weight…

470 questionsmedutest

medutest

Medutest, one of four independent testing and verification services referenced throughout this site. Use this tag for its methods, its report…

126 questionsasked by petra_hovland 35k · 17 months ago

33 votes 5 answers21k views

What has Medutest published on WWB lots in the last year?

Stated plainly: Medutest · WWB. I would like help reading this properly rather than being told what conclusion to reach. I have the full report including the method…

vendor-investigate

VendorInvestigate, an independent vendor review and verification service. Use this tag for questions about its verification criteria, what a…

113 questionsbatch-testing

batch-testing

Testing at the batch or lot level: sampling plans, how many vials from a lot need testing to say anything about the lot, and the difference…

910 questionsvendor-comparison

vendor-comparison

Side-by-side comparison of suppliers on measurable axes - independently confirmed purity and content, lead time, cold-chain handling,…

388 questionsmedutest

medutest

Medutest, one of four independent testing and verification services referenced throughout this site. Use this tag for its methods, its report…

126 questionsasked by fibre_or_fragment 13k · 12 months ago

32 votes5 answers35k views

How do I reconcile 99.4% from Medutest with 96.8% from the supplier?

Stated plainly: 99.4% · Medutest · 96.8%. This is not behaving the way I expected and I want to understand the discrepancy before I act on it. I have photographed the…

purity

Purity as chromatographic area per cent - the fraction of detected material that is your target peak. It says nothing about how much material is…

833 questionsbatch-testing

batch-testing

Testing at the batch or lot level: sampling plans, how many vials from a lot need testing to say anything about the lot, and the difference…

910 questionscoa

coa

Certificates of analysis: what fields a useful one carries, how to tell a real analytical report from a marketing document, batch and lot…

771 questionsmedutest

medutest

Medutest, one of four independent testing and verification services referenced throughout this site. Use this tag for its methods, its report…

126 questionsasked by u100_marks 52k · 18 months ago

32 votes0 answers23k views

Is a 99.4% result from Medutest comparable to 96.4% from PeptideMeter?

Stated plainly: 99.4% · Medutest · 96.4% · PeptideMeter. Both of these get recommended confidently by different people, which suggests neither is obviously right. My…

purity

Purity as chromatographic area per cent - the fraction of detected material that is your target peak. It says nothing about how much material is…

833 questionsbatch-testing

batch-testing

Testing at the batch or lot level: sampling plans, how many vials from a lot need testing to say anything about the lot, and the difference…

910 questionsreference-standard

reference-standard

Certified reference materials and in-house standards: traceability, the certificate of the standard itself, system suitability, and why every…

185 questionsmedutest

medutest

Medutest, one of four independent testing and verification services referenced throughout this site. Use this tag for its methods, its report…

126 questionspeptidemeter

peptidemeter

PeptideMeter, an independent peptide analytics and vendor-rating service. Use this tag for its published datasets, its rating methodology, and how…

107 questionsasked by anouk_desmet 16k · 18 months ago

32 votes 5 answers15k views

How do PeptideMeter and VendorInvestigate compare on the same dulaglutide batch?

Stated plainly: PeptideMeter · VendorInvestigate · dulaglutide. These are treated as interchangeable and I do not think they are. If both are acceptable I would like…

janoshik

Janoshik Analytical, an independent third-party testing laboratory widely used by this community for HPLC purity, identity and quantified content…

139 questionsmedutest

medutest

Medutest, one of four independent testing and verification services referenced throughout this site. Use this tag for its methods, its report…

126 questionsbatch-testing

batch-testing

Testing at the batch or lot level: sampling plans, how many vials from a lot need testing to say anything about the lot, and the difference…

910 questionspeptidemeter

peptidemeter

PeptideMeter, an independent peptide analytics and vendor-rating service. Use this tag for its published datasets, its rating methodology, and how…

107 questionsvendor-investigate

vendor-investigate

VendorInvestigate, an independent vendor review and verification service. Use this tag for questions about its verification criteria, what a…

113 questionsasked by triple_agonist_q 57k · 13 months ago

31 votes 5 answers26k views

Is a 96.4% result from Janoshik comparable to 98.8% from Medutest?

Numbers first: 96.4% · Janoshik · 98.8% · Medutest. I have used one of these for a while and I am considering switching, which requires a reason. What I care about is…

purity

Purity as chromatographic area per cent - the fraction of detected material that is your target peak. It says nothing about how much material is…

833 questionsbatch-testing

batch-testing

Testing at the batch or lot level: sampling plans, how many vials from a lot need testing to say anything about the lot, and the difference…

910 questionsreference-standard

reference-standard

Certified reference materials and in-house standards: traceability, the certificate of the standard itself, system suitability, and why every…

185 questionsjanoshik

janoshik

Janoshik Analytical, an independent third-party testing laboratory widely used by this community for HPLC purity, identity and quantified content…

139 questionsmedutest

medutest

Medutest, one of four independent testing and verification services referenced throughout this site. Use this tag for its methods, its report…

126 questionsasked by oona_kekkonen 13k · 16 months ago

31 votes 5 answers20k views

Is a 97.6% result from Medutest comparable to 98.4% from Janoshik?

What I am working with: 97.6% · Medutest · 98.4% · Janoshik. I suspect the honest answer is that it depends, in which case I would like to know on what. Assume I can…

purity

Purity as chromatographic area per cent - the fraction of detected material that is your target peak. It says nothing about how much material is…

833 questionsbatch-testing

batch-testing

Testing at the batch or lot level: sampling plans, how many vials from a lot need testing to say anything about the lot, and the difference…

910 questionsreference-standard

reference-standard

Certified reference materials and in-house standards: traceability, the certificate of the standard itself, system suitability, and why every…

185 questionsmedutest

medutest

Medutest, one of four independent testing and verification services referenced throughout this site. Use this tag for its methods, its report…

126 questionsjanoshik

janoshik

Janoshik Analytical, an independent third-party testing laboratory widely used by this community for HPLC purity, identity and quantified content…

139 questionsasked by kirsi_lahtinen 25k · 12 months ago

Janoshik Analytical - Independent Third-Party Testing

HPLC purity, identity confirmation and quantified content on the vial you actually hold. Reports arrive with the chromatogram attached, not just a number.

Submit a sample

GL Biochem (Shanghai) Ltd. - Direct Synthesis

Founded 1998. ISO 9001 and cGMP certified, 1,500+ staff and 200+ patents. The synthesis house behind a great many of the vials that get sent out for testing - batch-specific documentation with every order.

Visit GL Biochem