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Single comment threadYou are looking at one branch of reading mg/mL threads from 2024 and half of it aged badly — 57 comments in the full submission. View in context.
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c/reconstitution·submitted 2 years ago by u/quarter_dose_queen

reading mg/mL threads from 2024 and half of it aged badly

Correctionbranch of 12 comments

Trying to settle this properly because the thread from last year went in circles. The claim: insulin syringe matters. The counter-claim: it is measurement error. Both sides have been asserting it confidently for about 16 months without either producing anything. What would actually settle it is 39 people measuring…

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This branch

12 comments, started 2 years ago
u/alcohol_aversion151 points·2 years ago

i am begging people to write down the concentration

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[removed]100 points·2 years ago

[removed by moderator]

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u/units_not_mgsyringe math30 points·2 years ago·edited

[removed by moderator]

Adding to this: units is doing more work than the comment implies.

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u/nadia_kjaer127 points·2 years ago

Disagree but this is the good kind of wrong — it is specific enough to be checked.

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u/quarter_dose_queenOPlow and slow49 points·2 years ago

Reconstituted at 2mL when I meant 22mL. Caught it because the units looked wrong. Write the concentration.

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u/quarter_dose_queenOPlow and slow121 points·2 years 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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u/quarter_dose_queenOPlow and slow87 points·2 years ago

5mg vial, 2mL water, concentration is 5/2 — write it on the vial afterwards

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u/cardio_endpoint_c64 points·2 years ago

never post a calculation as advice without stating the concentration

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u/viktor_erdogan42 points·2 years ago

never post a calculation as advice without stating the concentration

Yes, exactly this, and it is the bit that took me 67 weeks to accept.

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u/units_not_mgsyringe math23 points·2 years ago

This is correct. 1mL versus 5mL is the common mistake.

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u/freya_onwuka26 points·2 years ago

never post a calculation as advice without stating the concentration

Yes, exactly this, and it is the bit that took me 66 weeks to accept.

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u/arto_falk70 points·2 years ago·edited

5mg vial, 2mL water, concentration is 5/2 — write it on the vial afterwards

Disagree on that part. 99.0% and 98.9% on the same vial is normal.

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← back to the whole thread

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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