4 units on an insulin syringe
4 units on a U-100 insulin syringe is 0.04 mL. On a 0.3 mL syringe that is line 4, counting one line per unit.
4 units = 0.04 mL
How much is in 4 units?
That depends on how the vial was mixed. Here is what 4 units carry for some common mixes:
| Vial mix | Strength | In 4 units |
|---|---|---|
| 5 mg vial + 1 mL water | 5 mg/mL | 0.2 mg |
| 5 mg vial + 2 mL water | 2.5 mg/mL | 0.1 mg |
| 10 mg vial + 1 mL water | 10 mg/mL | 0.4 mg |
| 10 mg vial + 2 mL water | 5 mg/mL | 0.2 mg |
| 10 mg vial + 3 mL water | 3.33 mg/mL | 0.133 mg |
| 20 mg vial + 2 mL water | 10 mg/mL | 0.4 mg |
Drawing exactly 4 units
- Use the smallest syringe that fits: 0.3 mL, 0.5 mL, 1 mL all work, and the 0.3 mL is easiest to read.
- Pull a little past 4, tap the barrel so bubbles rise, then push back to the 4 line.
- Read the line at the top edge of the dark stopper, not the bottom.
Is 4 units right for your vial?
Answer 4 quick taps and see exactly how many units to draw for your dose, on your syringe.
Calculate my unitsQuestions
How many mL is 4 units on an insulin syringe?
0.04 mL on a U-100 syringe.
Which syringe is best for 4 units?
The 0.3 mL (30 unit) syringe, because its lines are spaced widest for small volumes.