Analytics · Home & field testing · continued

Coming back to: Why quantitation is the hard part, not detection posts 91–93

Analytics › Home & field testing third-party testing documentation quality ELISA LOD & LOQ

This is a continuation of a long topic, addressed by post number rather than by page. Start at post 1.

t.wojcikTL29 Nov 2025#91

Post #89 and I disagree about the size of the effect, not about the direction.

A home refractometer is not measuring what people hope it is measuring in these preparations, and the readings are dominated by everything other than the peptide.

0 likes 9mo

j.dahlbergTL211 Nov 2025#92

Thank you for taking the time. That was more work than a reply usually is.

27 likes 9mo

v.bhattacharyaTL213 Nov 2025#93

bac_water, post #72: Quantitation is worth one more sentence than it usually gets, and the sentence is the one about how the number was arrived at. Go to post

Molecular tests: DNA or RNA tests are not applicable to peptides, which do not contain nucleic acids. Peptide-specific tests rely on protein recognition, not nucleic-acid detection.

If the premise is wrong, everything after it is decoration.

13 likes in reply to #72 8mo

This topic was referenced in

What consumer-accessible tests can and cannot determineAnalytics › Home & field testing · 2 replies

Suggested topics

Topic	Participants	Replies	Views	Activity
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
Why quantitation is the hard part, not detection Analytics › Home & field testing LOD & LOQ third-party testing ELISA Why quantitation is the hard part, not detection I have a specific reason for asking rather than idle curiosity, and the context is below. Collecting what is known about quantitation in one place, because it…	+11	15	27k	12mo
What a simple presence test is genuinely useful for — does this still hold? Analytics › Home & field testing ELISA LOD & LOQ third-party testing documentation quality Solved Pinned What a simple presence test is genuinely useful for — does this still hold? I have a specific reason for asking rather than idle curiosity, and the context is below. Trying to work out what would count as…		2	22k	16mo
Reflectance and photometric devices: precision in practice Analytics › Home & field testing third-party testing documentation quality LOD & LOQ Solved On the subject in the title: Reflectance and photometric devices: precision in practice Working notes rather than a conclusion. I was wrong about reflectance and photometric devices in a thread last spring…		2	2.2k	10mo
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

Related topics — sharing the tags third-party testing, documentation quality, ELISA

Topic	Participants	Replies	Views	Activity
Batch numbers that do not match the vial label — what changed since Sourcing › Red flags underdosing documentation quality disputed moderation Solved On the subject in the title: Batch numbers that do not match the vial label — what changed since Working notes rather than a conclusion. What changes if the standard account of Batch numbers is wrong? I ask…	+39	43	14k	1mo
About the Vendor reports category Sourcing › Vendor reports certificate of analysis batch & lot numbers third-party testing Pinned Wiki Structured reports on named suppliers. Batch, date, method and document, or it stays in the unverified column. This post is a community wiki: any member at trust level 3 or above can edit it, and every edit…		4	65k	18mo
Pricing far outside the range, in either direction Sourcing › Red flags disputed mislabelling underdosing moderation Solved Posting this under the heading it deserves: Pricing far outside the range, in either direction Everything below is what sits behind that. A question about pricing far outside the range that I think has a…	+3	7	27k	7mo
About the Red flags category Sourcing › Red flags mislabelling underdosing documentation quality Pinned Wiki Closed Patterns that reliably precede a problem. Documented, dated, and free of accusation without evidence. This post is a community wiki: any member at trust level 3 or above can edit it, and every edit is…		4	57k	17mo
Coming back to: Payment mechanics and the recovery options that do not exist Sourcing › Payments research use only payments documentation quality Under review On the subject in the title: Payment mechanics and the recovery options that do not exist Working notes rather than a conclusion. A payments question, with the mechanics separated from the money. What I would…	+7	11	2.6k	7mo