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c/reconstitution·posted 3 days ago by u/adaeze_cabrera

[Math] 10mg vial + 2mL bac water, i want 2.5mg, how many units

Math Clean Column ×1

I have had 24 orders now and I keep a table, so here is the honest summary rather than a vibe.

Material has been consistent. Communication has not. Shipping has varied by about 18 days on nominally the same lane, which matters more in summer than in February.

The independent number came back 99.0% against a claimed 99.1%, which I read as agreement rather than a discrepancy — inter-lab variance on this assay is a point or two either way and treating one lab as ground truth is how people end up in pointless arguments with vendors.

Batch number is in the comments. Ask if you want the method.

986 up / 157 down86% upvoted40 commentsid kvljq227 Jul 2026

40 comments

23 in this archive, depth 5

best — the order this archive was captured in

u/yusuf_achebe133 points·3 days ago

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

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u/ahmed_rasmussen76 points·2 days ago

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

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u/sock_puppet_spotter63 points·2 days ago

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

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u/swirl_dont_shakereconstitution119 points·2 days ago

Cored the stopper on my 13th draw because I kept using the same entry point. Rotate the puncture site.

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u/bruno_dumitru90 points·1 days ago

stopper coring on the 15th draw because you keep using the same entry point. rotate.

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[removed]85 points·2 days ago

[removed by moderator]

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u/britta_nakamura49 points·1 days ago

Show the arithmetic. Where did the units come from?

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u/janek_ferrari72 points·1 days ago

u-100 syringe, not u-40, or your math is off by factor of 18

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u/elodie_grimaldi67 points·2 days ago

Edit to your parent would help — the concentration you quoted assumes one scenario and you have written another above it.

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u/bruno_dumitru79 points·1 days ago

show your working or it is unhelpful

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u/swirl_dont_shakeMOD54 points·2 days ago

This is an urgent-care question wearing a forum question's clothes. Please contact a clinician rather than waiting for replies.

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u/sigrid_kaufmann26 points·2 days ago

i am begging people to write down the concentration

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u/emil_okwuosa16 points·2 days ago

This is an urgent-care question wearing a forum question's clothes.

Disagree on that part. 96.8% and 96.2% on the same vial is normal.

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u/adaeze_cabreraOP20 points·1 days ago

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

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u/janek_ferrari68 points·1 days ago

The practical rule people converge on is 28 days at fridge temperature after first puncture, and that comes from the preservative, not the peptide.

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u/priya_guerrero50 points·2 days ago

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

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u/viktor_kirchner29 points·2 days ago·edited

Disagree. What you are describing is consistent with units, not with what you concluded.

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u/escrow_evangelist8 points·2 days ago

i am begging people to write down the concentration

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u/batch_number_bertievetting5 points·1 days ago·edited

stopper coring on the 12th draw because you keep using the same entry point. rotate.

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u/yusuf_nakamura2 points·1 days ago

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

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u/cardio_endpoint_c37 points·2 days ago

Dead space ate 3 units on a low-volume draw. Tiny impact at 5mg, massive impact at 2.4mg.

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u/kavya_radich18 points·2 days ago·edited

What was the vial size and how much bac water?

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u/escrow_evangelist23 points·2 days ago

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

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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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