Laboratory calculator
PT-141 Units Chart (10 mg vial)
Worked example
Worked example: a 10 mg vial of PT-141 with 2 mL of water has a concentration of 5 mg/mL, so a 250 mcg example amount reads 5 units and 500 mcg reads 10 units on a U-100 syringe. With 5 mL the same 250 mcg reads 12.5 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 | 10 | 0.5 | 1 | 2.5 | 5 | 7.5 | 10 | 15 | 20 | 25 | 50 |
| 2 | 5 | 1 | 2 | 5 | 10 | 15 | 20 | 30 | 40 | 50 | 100 |
| 3 | 3.3333 | 1.5 | 3 | 7.5 | 15 | 22.5 | 30 | 45 | 60 | 75 | 150 |
| 5 | 2 | 2.5 | 5 | 12.5 | 25 | 37.5 | 50 | 75 | 100 | 125 | 250 |
How it works
Each cell is units = target amount in mg / concentration x 100, where concentration = vial mass / water volume. For 10 mg in 2 mL the concentration is 5 mg/mL, so a 250 mcg example amount is 0.25 / 5 x 100 = 5 units.
Frequently asked questions
How many units is 250 mcg of PT-141 from a 10 mg vial?
It depends on the water volume: 2.5 units with 1 mL, 5 with 2 mL, 7.5 with 3 mL and 12.5 with 5 mL in a 10 mg vial.
Why does adding more water change the unit reading?
More water lowers the concentration, from 10 mg/mL at 1 mL to 2 mg/mL at 5 mL, so the same target amount occupies more volume and reads more units.
How much PT-141 is in one unit on a U-100 syringe?
One unit is 0.01 mL. At 5 mg/mL (the 2 mL row) one unit holds 50 mcg of PT-141.
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