Milliliter (mL)
Also known as: mL
A milliliter is a unit of liquid volume equal to one-thousandth of a liter. Syringes measure volume in milliliters, and on a U-100 insulin syringe, 1 mL equals 100 units.
Overview
In peptide research, the milliliter is used in two key contexts: the volume of diluent added during reconstitution and the volume drawn into a syringe for each dose. Because insulin syringes are calibrated in units rather than milliliters, researchers must understand the conversion between the two (dependent on syringe type — U-100 or U-40). The concentration of a reconstituted peptide is always expressed as mcg per mL, making the milliliter the denominator in every dosing calculation. Precise measurement of diluent volume during reconstitution is critical because it directly determines the concentration of the resulting solution.
Related Terms
Frequently asked questions
How many units is 1 mL on a U-100 syringe?+
On a U-100 syringe, 1 mL equals 100 units. So 0.1 mL = 10 units and 0.01 mL = 1 unit.
How many units is 1 mL on a U-40 syringe?+
On a U-40 syringe, 1 mL equals 40 units. So 0.1 mL = 4 units.
How do I measure 0.5 mL on an insulin syringe?+
On a U-100 syringe, 0.5 mL equals 50 units. Draw to the 50-unit line. On a U-40 syringe, 0.5 mL equals 20 units.