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c/labresults·posted 2 months ago by u/rina_bergstrom

[Lab] split one vial across Medutest and Janoshik — 97.6% and 95.1%

Lab Slow Clap ×2 Sourced ×1

split one vial across Medutest and Janoshik — 97.6% and 95.1%. That is the headline. The document, the batch and the service are below so you can argue with the method rather than with me.

Pulling the figures out of the title: 97.6% and 95.1%. All of it is written down as it happened rather than reconstructed.

BCH BPC, batch matched the paperwork, PeptideMeter came back 99.6% against a claimed 99.0%. Paid for it myself, posting it because the log is only worth anything if people do.

A series across separate lots estimates a process. Repeat tests on one lot estimate the measurement. Both are useful and they answer different questions.

Ask me anything specific. Anything general I will probably get wrong.

1,153 up / 207 down85% upvoted33 commentsid pkyagh28 May 2026

33 comments

17 in this archive, depth 6

best — the order this archive was captured in

u/slow_logbook_ftw181 points·2 months ago·edited

Date of analysis anchors the result to a manufacturing period. A two-year-old result is evidence about two years ago and should be read that way.

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u/mod_ambulatoryadmin143 points·2 months ago

How many separate lots does your series cover?

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u/teodor_jansen50 points·2 months ago

Fourth lot from the same supplier in the log now and the band has been tight the whole way. That consistency is the actual finding.

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u/usp_appendixcompendial111 points·2 months ago

Is that the same lot as the one in the thread from last month?

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u/gustav_cardoso50 points·2 months ago

date of analysis matters as much as the number

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u/milos_trevino12 points·2 months ago

I would not post that as a finding. It is a single result and the template asks you to say so.

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u/throwaway_44b1-24 points·2 months ago

Do you have the trace, or only the summary?

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u/marisol_moreau1 point·2 months ago

Cosigning on saying who paid. It is the whole basis on which this log is worth anything.

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u/enzo_fonseca1 point·2 months ago

Cosigning on saying who paid.

This is why the template has a batch field. Without it the result is about a vial nobody can identify.

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u/britta_boateng1 point·2 months ago

one result is a data point, agreement between two services is evidence

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u/rina_bergstrom1 point·2 months ago

Correcting myself: I quoted net peptide content against somebody else’s area percent. Not a comparison.

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u/milan_villalobos1 point·2 months ago

area percent unless the report says otherwise

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u/meera_sandvik1 point·2 months ago

three lots beats three tests on one lot

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u/thandi_solberg1 point·2 months ago

Which service, and did you pay for it yourself?

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u/rina_bergstromOP1 point·2 months ago

Did the vial lot match the paperwork lot?

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u/elise_ramos1 point·2 months ago

the trend across lots is worth more than any single figure

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About c/labresults

A running record of independent test results people paid for themselves. Every post follows the same shape: vendor, product, batch, testing service, method, and the number. Good results and bad results are equally welcome and get equal scrutiny.

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Oct 2023created
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Sponsored

Janoshik Analytical

Independent HPLC and mass spec. The number you get is the number they found.

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GL Biochem (Shanghai)

Custom peptides and amino acids direct from the manufacturer since 1998. ISO 9001 / cGMP. Batch COA every order.

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