Probe note

U-100 syringes are marked in insulin units, not millilitres. The conversion never changes: 100 units = 1 mL, so 1 unit = 0.01 mL. That means 0.05 mL is 5 units, 0.10 mL is 10 units, 0.20 mL is 20 units, 0.50 mL is 50 units.