PeptideCalculations
0.6 mg/mL · 600 mcg/mL · 6 mcg per U-100 unit

3 mg vial + 5 mL bacteriostatic water

A 3 mg vial reconstituted with 5 mL comes to 0.6 mg/mL. Every unit on a U-100 insulin syringe then carries 6 mcg, so 250 mcg is 41.7 units (0.42 mL) and the vial holds 12 draws of that size.

Units for each amount

3 mg vial + 5 mL = 0.6 mg/mL (600 mcg/mL, 6 mcg per unit on U-100)
DosemLU-100 unitsU-40 unitsDoses per vial
50 mcg0.0838.33.360
100 mcg0.1716.76.730
150 mcg0.25251020
200 mcg0.3333.313.315
250 mcg0.4241.716.712
300 mcg0.5502010
400 mcg0.6766.726.77
500 mcg0.8383.333.36
750 mcg1.25125504
1 mg1.67166.766.73
1.5 mg2.52501002
2 mg3.33333.3133.31
2.5 mg4.17416.7166.71

Same vial, other volumes

The mass does not move. Only the concentration and the unit count do.

Watermg/mLmcg per unit250 mcg =
0.5 mL6604.2 unitstable →
1 mL3308.3 unitstable →
1.5 mL22012.5 unitstable →
2 mL1.51516.7 unitstable →
2.5 mL1.21220.8 unitstable →
3 mL11025 unitstable →
5 mL0.6641.7 units

Try other numbers

mL
Draw to
—units
— mL on a U-100, 1 mL barrel
Concentration
—mg/mL
— mcg per unit
Doses in the vial
—
of

3 mg + 5 mL questions

What concentration is 3 mg in 5 mL?

3 mg divided by 5 mL is 0.6 mg/mL, which is 600 mcg/mL. On a U-100 syringe each unit holds 0.01 mL, so one unit carries 6 mcg.

How many units is 250 mcg from a 3 mg vial with 5 mL?

250 mcg divided by 600 mcg/mL is 0.42 mL, which is 41.7 units on a U-100 syringe and 16.7 units on a U-40 syringe. The vial holds 12 draws of that size.

What if I add 0.5 mL instead of 5 mL to the 3 mg vial?

The mass stays 3 mg. With 0.5 mL the concentration is 6 mg/mL instead of 0.6 mg/mL, so the same amount per draw needs fewer units: 250 mcg becomes 4.2 units instead of 41.7.

Does a 3 mg vial hold 5 mL?

Not always. Many lyophilized peptide vials are 2 mL or 3 mL glass; 5 mL will not fit in those. Check the vial before choosing this volume, or split the mass across two vials.

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