Laboratory calculator

IGF-1 LR3 Reconstitution Calculator (1 mg vial)

Worked example

Worked example: a 1 mg vial of IGF-1 LR3 reconstituted with 2 mL of bacteriostatic water has a concentration of 0.5 mg/mL. A 250 mcg example amount is a 0.5 mL aliquot, which reads 50 units on a U-100 syringe, and the vial holds 4 aliquots of that size.

Reconstitution calculator

Vial size (mg)

Bacteriostatic water added (mL)

Target amount per draw (mcg)

Syringe (U-100)

Sizes in published sources1 mg

Concentration: 0.5 mg/mL
Volume to draw: 0.5 mL
Units on a U-100 syringe: 50 units
Draws per vial: 4

How it works

Concentration = vial mass / water volume: 1 mg / 2 mL = 0.5 mg/mL.
Aliquot volume = target amount / concentration: 0.25 mg / 0.5 mg/mL = 0.5 mL.
Units on a U-100 syringe = mL x 100 = 50.
Aliquots per vial = vial mass in mcg / target amount = 1,000 / 250.

Frequently asked questions

How much water does a 1 mg vial of IGF-1 LR3 need for 0.5 mg/mL?

Concentration is vial mass divided by water volume: 1 mg / 2 mL = 0.5 mg/mL. Change the water volume in the calculator to see how the concentration and the syringe reading move together.

How many units on a U-100 syringe is a 250 mcg example amount of IGF-1 LR3?

At 0.5 mg/mL a 250 mcg example amount is 0.5 mL, which is 50 units because 1 unit on a U-100 syringe equals 0.01 mL.

How many 250 mcg aliquots are in a 1 mg vial of IGF-1 LR3?

1 mg is 1,000 mcg, and 1,000 mcg divided by 250 mcg gives 4 aliquots, before allowing for volume lost to priming and syringe dead space.