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c/reconstitution·posted 4 months ago by u/ahmed_rasmussen

someone explain units to me like I have not read a paper in years

Correction The Quiet One ×2 Receipts ×1

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 17 months without either producing anything.

What would actually settle it is 21 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.

2,153 up / 429 down83% upvoted24 commentsid 2xtd6828 Mar 2026

24 comments

17 in this archive, depth 5

best — the order this archive was captured in

u/yusuf_achebe336 points·4 months ago
nope. mine was the opposite.
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u/niels_roos277 points·4 months ago

This is correct. 1mL versus 4mL is the common mistake.

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u/cesar_ivaturi82 points·4 months ago

Is that 15mg vial or 11mg?

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u/swirl_dont_shakeMOD182 points·4 months ago

Retitled to remove editorialising. Put the evidence in the body.

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u/ahmed_rasmussenOP104 points·4 months ago

Yeah, showing the arithmetic is the fastest way for someone to spot the error.

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u/niels_roos116 points·4 months ago

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

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u/andres_sorensen33 points·4 months ago

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

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

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u/wanjiru_varga16 points·4 months ago

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

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[removed]13 points·4 months ago

[removed by moderator]

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u/alcohol_aversion48 points·4 months ago

Slight fix: the number was 96.8, not 99.2. Decimal point, but a fairly consequential one.

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u/ahmed_rasmussenOP0 points·4 months ago

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

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u/india_generic_g1 point·4 months ago

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

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u/adaeze_cabrera13 points·4 months ago

This is correct. 2mL versus 12mL is the common mistake.

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u/santiago_ndiaye76 points·4 months ago

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

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u/hedda_adeyemi56 points·4 months ago·edited

dead space is real and the syringe matters

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u/ahmed_rasmussenOP22 points·4 months ago

Spent 9 weeks confused about concentration math until someone showed me the table. 30mg, 2mL, concentration is 30/2.

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u/india_generic_g-19 points·4 months ago

I love that this community will spend 40 comments on a detail. That pedantry is why the numbers here matter.

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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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