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ForumsCOA & Analytical TestingInter-lab variability in peptide testing — July 2024 Page 4

Inter-lab variability in peptide testing — July 2024

sean_dublin Fri, Nov 28, 2025 at 12:36 PM 30 replies 1,343 viewsPage 4 of 6
sean_dublin
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Nov 28, 2025 at 6:16 PM#16

OP here — wow, did not expect this much response! Thank you all for the thoughtful replies on Inter-lab variability in.

To answer Dr.KarenChen: I get my labs done through Quest every 3 months.

Quick update: my latest labs came back even better. Thanks again for the evidence-based discussion — this is exactly why I posted in a science-based community. 🙏

Last edited: Nov 28, 2025 at 7:16 PM
32 20hannah_MT, Dr.SportsMedIN, amy_econ_NJ and 29 others
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BiostatsBrad
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Durham, NC
Nov 28, 2025 at 6:33 PM#17

Relevant to Inter-lab variability in — here is my latest bloodwork comparison:

Key improvements: A1C 7.2% → 5.3%, triglycerides 199 → 99 mg/dL, hsCRP 6.0 → 1.1 mg/L. All on tirzepatide for 15 months.

The inflammatory marker drop is what impresses me most. Consistent with the SELECT trial's cardiovascular findings.

8 2Dr.BariatricHTX, LindaRN_retired, tommy_boulder and 5 others
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NauseaFreeNow
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Aug 2024
Indiana
Nov 28, 2025 at 6:50 PM#18

Yep. My endo said the same thing about Inter-lab variabilit.

4 12Dr.PulmRoch, maya_sedona, stefan_berlin and 1 other
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JennaRN
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Nov 28, 2025 at 7:07 PM#19

Slightly tangential to Inter-lab variability in but JakeSmashed95 reminded me — has the insurance landscape changed recently?

I know it is not exactly on-topic but it seems related enough to ask here rather than starting a new thread. Apologies if this has been covered — I did search first.

7 7RegAffairsDC, BiostatsBrad, PeptideSynthNJ and 4 others
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NurseAsh_DET
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Detroit, MI
Nov 28, 2025 at 7:24 PM#20
sean_dublin said:
Thank you all for the thoughtful replies on Inter-lab variability in

This is exactly right. sean_dublin articulated what I have been trying to explain to my friends for months. The Inter-lab variability in aspect is what made the difference for me.

24 15emily_PDX, Dr.SleepRoch, laura_annarbor and 21 others
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