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c/reconstitution·posted 5 months ago by u/ledger_mod

my A1c moved and I cannot work out whether dead space is why

Discussion Cold Box ×2 Clean Column ×3

Right, the units question again, but with numbers this time.

I have 12 data points over 18 weeks. The pattern is consistent enough that I do not think it is chance, and boring enough that nobody is going to screenshot it, which is usually a good sign.

The thing I would flag for anyone new: the effect I am describing showed up at week 3, not week 52. People give up long before the interesting part.

Interested in whether this matches other people's logs or whether I am an outlier.

2,180 up / 467 down82% upvoted36 commentsid 4vql1126 Feb 2026

36 comments

12 in this archive, depth 4

best — the order this archive was captured in

u/dexa_twice_yearlybody comp270 points·5 months ago
i do not know. that is the honest answer.
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u/ledger_modOPmod · vetting192 points·5 months ago

bacteriostatic and sterile water are not interchangeable, do not use them that way

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u/vial_math_verasyringe math150 points·5 months ago·edited

The confident tone is doing a lot of work that the evidence is not.

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u/reflux_report-19 points·5 months ago

swirl, do not shake, or you are courting oxidation

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u/aurel_boateng166 points·5 months ago

dosing errors come from people reconstituting two vials differently and forgetting which is which

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[removed]122 points·5 months ago

[removed by moderator]

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u/tl_dr_tina114 points·5 months ago

i am begging people to write down the concentration

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u/santiago_ndiaye38 points·5 months ago·edited

i am begging people to write down the concentration

Counter-anecdote: opposite result, same dose. Which mostly tells us the variance is huge.

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u/marisol_frisk20 points·5 months ago

bacteriostatic and sterile water are not interchangeable, do not use them that way

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u/nabila_espinoza65 points·5 months ago

Cosigning. The concentration on the vial in marker is load-bearing.

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u/bac_water_banditreconstitution39 points·5 months ago

Slight fix: the number was 97.6, not 98.0. Decimal point, but a fairly consequential one.

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u/ledger_modOPmod · vetting29 points·5 months ago

The single most useful thing I did was write the concentration on the vial. Stopped all the confusion after that.

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About c/reconstitution

The arithmetic and the technique. Bacteriostatic versus sterile water, reconstitution volume as a concentration choice, converting mg/mL into insulin-syringe units, dead space, swirl-not-shake, stopper coring, and how long a reconstituted vial is actually good for. Math errors get corrected fast and politely.

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