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c/reconstitution·posted 2 months ago by u/dilara_szabo

unpopular opinion: mg/mL is massively overrated

Correction Receipts ×3 Long Haul ×1 Cold Box ×2

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

The claim: reconstitution matters. The counter-claim: it is measurement error. Both sides have been asserting it confidently for about 23 months without either producing anything.

What would actually settle it is 25 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.

2,667 up / 60 down98% upvoted19 commentsid 4vtqj021 May 2026

19 comments

12 in this archive, depth 5

best — the order this archive was captured in

u/marisol_frisk352 points·2 months ago·edited

swirl, do not shake, or you are courting oxidation

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[deleted]142 points·2 months ago

[deleted]

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u/aleksi_lehtinen306 points·2 months ago

Three years on this site and the questions have not changed at all. Which is depressing or reassuring depending on the day.

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u/bac_water_banditMOD201 points·2 months ago

Tracking number removed. It identifies both ends of a shipment.

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u/ines_ekstrom119 points·2 months ago

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

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u/dilara_szaboOP95 points·2 months ago

never post a calculation as advice without stating the concentration

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u/britta_nakamura-1 point·2 months ago

more water means more units for the same dose, which means finer resolution

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u/hub_opssite staff161 points·2 months ago

never post a calculation as advice without stating the concentration

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u/dilara_szaboOP70 points·2 months ago

Is that 15mg vial or 29mg?

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u/bac_water_banditreconstitution61 points·2 months ago

more water means more units for the same dose, which means finer resolution

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u/soren_zamora86 points·2 months ago

Inter-lab variance on this kind of assay is routinely 1–2 points. Different column, different gradient, different integration.

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u/elodie_grimaldi27 points·2 months ago

30mg vial, 2mL water, concentration is 30/2 — write it on the vial afterwards

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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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