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c/reconstitution·posted 3 months ago by u/liv_nkemelu

[Question] units — what am I missing here

Question Receipts ×6

Trying to settle this properly because the thread from last year went in circles.

The claim: units matters. The counter-claim: it is measurement error. Both sides have been asserting it confidently for about 4 months without either producing anything.

What would actually settle it is 31 people measuring the same thing the same way. I have started; my numbers are below. They lean one way but not strongly enough for me to declare victory.

If you have data, post the data. If you have an opinion, flair it as an opinion.

770 up / 188 down80% upvoted18 commentsid 73qk2s13 Apr 2026

18 comments

14 in this archive, depth 5

best — the order this archive was captured in

u/quiet_reader_99-31 points·3 months ago

Mechanistically the bit that matters is reconstitution. It explains most of the early profile and a decent chunk of the outcome.

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u/batch_number_bertievetting-37 points·3 months ago

Sceptical. If this were true we would see it reflected in the data and we do not.

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u/bac_water_banditMOD42 points·3 months ago

Flair changed to match the content. Read the sidebar before posting next time and we are square.

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u/vito_beaulieu20 points·3 months ago

stopper coring on the 4th draw because you keep using the same entry point. rotate.

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u/katrin_marchetti14 points·3 months ago

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

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u/georgi_adebayo23 points·3 months ago

the concentration on the vial in marker is the most important step

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u/liv_nkemeluOP23 points·3 months ago

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

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u/aleksi_lehtinen6 points·3 months ago

Respectfully this is a sample of one presented as a finding.

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u/liv_nkemelu25 points·3 months ago

stopper coring on the 21th draw because you keep using the same entry point. rotate.

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u/santiago_ndiaye29 points·3 months ago

stopper coring on the 21th draw because you keep using the same entry point.

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

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u/gradient_goblin23 points·3 months ago·edited

This is correct. 3mL versus 3mL is the common mistake.

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u/erez_perrin18 points·3 months ago

swirl, do not shake, or you are courting oxidation

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u/viktor_kirchner9 points·3 months ago

Did you write the concentration on the vial?

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u/lyophile_lou19 points·3 months ago

stopper coring on the 7th draw because you keep using the same entry point. rotate.

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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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