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Single comment threadYou are looking at one branch of genuine question about concentration that I am slightly embarrassed to ask — 38 comments in the full submission. View in context.
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c/reconstitution·submitted 3 months ago by u/julia_erdogan

genuine question about concentration that I am slightly embarrassed to ask

PSAbranch of 6 comments

genuine question about concentration that I am slightly embarrassed to ask. If this has been answered properly somewhere, link me and I will delete. The failure modes I have actually seen posted here, in order of frequency. One: reconstituting at a different volume than intended and not writing it down, so the next…

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6 comments, started 3 months ago
u/bac_water_banditMOD156 points·3 months ago

Corrected the concentration in the title, which contradicted the body. Nothing else touched.

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u/vito_beaulieu73 points·3 months ago

Agreed — units are volume. Once that lands, the rest of the arithmetic is one division.

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u/katrin_marchetti52 points·3 months ago

What concentration did you actually reconstitute at, rather than what did you intend to?

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u/georgi_adebayo84 points·3 months ago

Careful — that arithmetic is wrong. 5mg in 1mL is 5mg/mL, so 5mg draws to 100 units, not what you wrote.

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u/julia_erdoganOP45 points·3 months ago

Correction: that gives 50 units, not what you have written. 10mg into 1mL is 10mg/mL and the division follows from there.

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u/julia_erdoganOP84 points·3 months ago

That is sterile water, not bacteriostatic. Same appearance, different product, and it matters for a multi-draw vial.

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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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