Laboratory calculator
Oxytocin Units Chart (2 mg vial)
Worked example
For 2 mg of Oxytocin, the chart row for 2 mL shows 1 mg/mL: 250 mcg is 25 units and 500 mcg is 50 units. The 5 mL row drops the concentration to 0.4 mg/mL and moves 250 mcg to 62.5 units.
Units chart
| Water added (mL) | Concentration (mg/mL) | Units on a U-100 syringe, by target amount (mcg) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 50 | 100 | 250 | 500 | 750 | 1000 | 1500 | 2000 | 2500 | 5000 | ||
| 1 | 2 | 2.5 | 5 | 12.5 | 25 | 37.5 | 50 | 75 | 100 | 125 | 250 |
| 2 | 1 | 5 | 10 | 25 | 50 | 75 | 100 | 150 | 200 | 250 | 500 |
| 3 | 0.6667 | 7.5 | 15 | 37.5 | 75 | 112.5 | 150 | 225 | 300 | 375 | 750 |
| 5 | 0.4 | 12.5 | 25 | 62.5 | 125 | 187.5 | 250 | 375 | 500 | 625 | 1250 |
How it works
Each cell is units = target amount in mg / concentration x 100, where concentration = vial mass / water volume. For 2 mg in 2 mL the concentration is 1 mg/mL, so a 250 mcg example amount is 0.25 / 1 x 100 = 25 units.
Frequently asked questions
How many units is 250 mcg of Oxytocin from a 2 mg vial?
It depends on the water volume: 12.5 units with 1 mL, 25 with 2 mL, 37.5 with 3 mL and 62.5 with 5 mL in a 2 mg vial.
Why does adding more water change the unit reading?
More water lowers the concentration, from 2 mg/mL at 1 mL to 0.4 mg/mL at 5 mL, so the same target amount occupies more volume and reads more units.
How much Oxytocin is in one unit on a U-100 syringe?
One unit is 0.01 mL. At 1 mg/mL (the 2 mL row) one unit holds 10 mcg of Oxytocin.
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