Tags · Sourcing

third-party testing

Testing commissioned by someone other than the seller.

62 topics 19 solved Group: Sourcing

62 topics · page 1 of 3

Topic	Participants	Replies	Views	Activity
What consumer-accessible tests can and cannot determine Analytics › Home & field testing documentation quality ELISA third-party testing What consumer-accessible tests can and cannot determine — that is the question, and I have not found it answered plainly anywhere I have looked. Something about consumer-accessible tests does not reconcile…		2	17k	1h
How the vendor documentation pages are maintained, and by whom Sourcing › Vendor reports certificate of analysis Janoshik Analytical batch & lot numbers documentation quality Solved How the vendor documentation pages are maintained, and by whom I have a specific reason for asking rather than idle curiosity, and the context is below. Vendor documentation pages keeps being re-asked here…		2	6k	4h
Chain of custody for a sample you posted yourself Sourcing › Independent verification PeptideMeter third-party testing Janoshik Analytical blind sampling Chain of custody for a sample you posted yourself Writing it up because I had to work it out twice and would rather nobody else did. I was wrong about chain of custody in a thread last spring and I would like…		2	7.3k	5h
Reading a home test result without over-claiming Analytics › Home & field testing ELISA documentation quality LOD & LOQ third-party testing Reading a home test result without over-claiming — setting out what I have, and where I think it stops being reliable. Collecting what is known about reading a home test result in one place, because it is…	+124	137	19k	7h
Documenting a supplier's response to a discrepancy Sourcing › Vendor reports third-party testing documentation quality batch & lot numbers Solved On the subject in the title: Documenting a supplier's response to a discrepancy Working notes rather than a conclusion. A question about how a record should be read rather than about a supplier. We have…	+44	49	589	8h
Coming back to: Why our vendor pages link the storefront and mark it sponsored Sourcing › Vendor reports third-party testing batch & lot numbers certificate of analysis documentation quality Why our vendor pages link the storefront and mark it sponsored I have a specific reason for asking rather than idle curiosity, and the context is below. Reading back through what has been written here about…		2	22k	8h
Coming back to: Lateral-flow and colorimetric approaches: the specificity problem Analytics › Home & field testing third-party testing LOD & LOQ documentation quality ELISA Solved On the subject in the title: Lateral-flow and colorimetric approaches: the specificity problem Working notes rather than a conclusion. Lateral-flow and colorimetric approaches — I have the observation and I…	+77	89	16k	9h
What consumer-accessible tests can and cannot determine — a second dataset Analytics › Home & field testing ELISA LOD & LOQ third-party testing documentation quality Solved What consumer-accessible tests can and cannot determine — a second dataset I have a specific reason for asking rather than idle curiosity, and the context is below. Posting a small dataset on…	+117	131	45k	10h
Cost versus information: making the trade-off explicitly Analytics › Home & field testing LOD & LOQ third-party testing ELISA documentation quality Cost versus information: making the trade-off explicitly Writing it up because I had to work it out twice and would rather nobody else did. Asking about cost versus information directly, because I have read…	+2	6	12k	11h
A comparison of home results against a laboratory result on the same vial — does this still hold? Analytics › Home & field testing ELISA third-party testing LOD & LOQ documentation quality Solved A comparison of home results against a laboratory result on the same vial — does this still hold? I have a specific reason for asking rather than idle curiosity, and the context is below. Comparison of home…	+2	6	15k	11h
Chain of custody for a sample you posted yourself — one year on Sourcing › Independent verification VendorInvestigate Janoshik Analytical blind sampling third-party testing Posting this under the heading it deserves: Chain of custody for a sample you posted yourself — one year on Everything below is what sits behind that. Posting a small dataset on Chain of custody. It is mine,…	+28	32	50k	15h
Reporting a good result: why nobody bothers and why they should Sourcing › Vendor reports third-party testing Janoshik Analytical certificate of analysis batch & lot numbers Reporting a good result: why nobody bothers and why they should — setting out what I have, and where I think it stops being reliable. Reporting a good result: setting out the arithmetic in full, because I…		2	3.5k	17h
[2026 update] Interpreting a result that disagrees with the supplier's certificate Sourcing › Independent verification Medutest VendorInvestigate blind sampling third-party testing Solved On the subject in the title: Interpreting a result that disagrees with the supplier's certificate Working notes rather than a conclusion. Structured report rather than an opinion, following the format the…	+121	128	51k	17h
Comparing documentation quality across the directory, tabulated Sourcing › Vendor reports third-party testing disputed Janoshik Analytical batch & lot numbers Comparing documentation quality across the directory, tabulated — setting out what I have, and where I think it stops being reliable. I have spent a fortnight trying to pin comparing documentation quality…	+7	11	29k	19h
What I would want from a home test that does not exist yet — what changed since Analytics › Home & field testing third-party testing LOD & LOQ documentation quality ELISA Solved Asking directly, because I could not find a straight answer: What I would want from a home test that does not exist yet — what changed since Two reports on the same lot, and I would like help deciding whether…	+101	111	1.9k	21h
Submitting a sample: the process end to end Sourcing › Independent verification blind sampling PeptideMeter VendorInvestigate third-party testing On the subject in the title: Submitting a sample: the process end to end Working notes rather than a conclusion. Submitting a sample keeps being re-asked here and I think that is because the answer is…	+99	114	29k	21h
Second pass at: Cost versus information: making the trade-off explicitly Analytics › Home & field testing third-party testing documentation quality ELISA Posting this under the heading it deserves: Second pass at: Cost versus information: making the trade-off explicitly Everything below is what sits behind that. Posting a small dataset on Cost versus…	+23	27	6.1k	22h
Revisiting: The report format the maintainers ask for, and why each field is there Sourcing › Vendor reports batch & lot numbers Janoshik Analytical documentation quality third-party testing Posting this under the heading it deserves: Revisiting: The report format the maintainers ask for, and why each field is there Everything below is what sits behind that. Structured report rather than an…	+100	108	57k	1d
What a simple presence test is genuinely useful for Analytics › Home & field testing documentation quality ELISA third-party testing LOD & LOQ Solved What a simple presence test is genuinely useful for — that is the question, and I have not found it answered plainly anywhere I have looked. Trying to work out what would count as evidence on simple presence…		2	58	1d
Revisiting: Can a home kit substitute for a laboratory report? A careful no Analytics › Home & field testing ELISA LOD & LOQ documentation quality third-party testing Revisiting: Can a home kit substitute for a laboratory report? A careful no — setting out what I have, and where I think it stops being reliable. I would like to disagree carefully with the settled view on…	+50	56	9.8k	1d
The report format the maintainers ask for, and why each field is there Sourcing › Vendor reports disputed documentation quality batch & lot numbers certificate of analysis Solved On the subject in the title: The report format the maintainers ask for, and why each field is there Working notes rather than a conclusion. Structured report rather than an opinion, following the format the…		4	6.3k	1d
[2026 update] A report I filed that turned out to be wrong, and the correction Sourcing › Vendor reports batch & lot numbers third-party testing documentation quality certificate of analysis On the subject in the title: A report I filed that turned out to be wrong, and the correction Working notes rather than a conclusion. Structured report rather than an opinion, following the format the…	+15	19	18k	2d
How Janoshik, Medutest, PeptideMeter and VendorInvestigate differ — does this still hold? Sourcing › Independent verification PeptideMeter VendorInvestigate third-party testing Janoshik Analytical Asking directly, because I could not find a straight answer: How Janoshik, Medutest, PeptideMeter and VendorInvestigate differ — does this still hold? A question about how a record should be read rather than…	+24	28	8k	1mo
Blind submission and why it changes minds — the long version Sourcing › Independent verification Medutest third-party testing Janoshik Analytical Posting this under the heading it deserves: Blind submission and why it changes minds — the long version Everything below is what sits behind that. A narrow question about Blind submission, deliberately…	+98	113	18k	2mo
How Janoshik, Medutest, PeptideMeter and VendorInvestigate differ — a second dataset Sourcing › Independent verification Janoshik Analytical blind sampling PeptideMeter VendorInvestigate Solved How Janoshik, Medutest, PeptideMeter and VendorInvestigate differ — a second dataset I have a specific reason for asking rather than idle curiosity, and the context is below. Posting a small dataset on…	+42	46	46k	2mo
Second pass at: What "verified" means on our vendor pages, stated narrowly Sourcing › Vendor reports Janoshik Analytical documentation quality third-party testing batch & lot numbers Solved Second pass at: What "verified" means on our vendor pages, stated narrowly — setting out what I have, and where I think it stops being reliable. A question about how a record should be read rather than about…	+94	102	20k	3mo
[2026 update] What a purity-only report leaves out Sourcing › Independent verification PeptideMeter third-party testing Janoshik Analytical The question in the title: What a purity-only report leaves out I will give what I have already checked below so nobody repeats it. Structured report rather than an opinion, following the format the…	+97	103	5.2k	3mo
Choosing which test to pay for, given a fixed budget Sourcing › Independent verification third-party testing VendorInvestigate Medutest Janoshik Analytical On the subject in the title: Choosing which test to pay for, given a fixed budget Working notes rather than a conclusion. A question about how a record should be read rather than about a supplier. We have…	+60	70	49k	3mo
What a documentation review can and cannot tell you — a second dataset Sourcing › Independent verification Janoshik Analytical VendorInvestigate blind sampling third-party testing The question in the title: What a documentation review can and cannot tell you — a second dataset I will give what I have already checked below so nobody repeats it. Posting a small dataset on documentation…		4	170	4mo
Interpreting a result that disagrees with the supplier's certificate Sourcing › Independent verification Janoshik Analytical Medutest PeptideMeter third-party testing Interpreting a result that disagrees with the supplier's certificate Writing it up because I had to work it out twice and would rather nobody else did. Structured report rather than an opinion, following the…	+129	153	7.3k	5mo

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