Laboratory calculator
KPV Units Chart (5 mg vial)
Worked example
For 5 mg of KPV, the chart row for 2 mL shows 2.5 mg/mL: 250 mcg is 10 units and 500 mcg is 20 units. The 5 mL row drops the concentration to 1 mg/mL and moves 250 mcg to 25 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 | 5 | 1 | 2 | 5 | 10 | 15 | 20 | 30 | 40 | 50 | 100 |
| 2 | 2.5 | 2 | 4 | 10 | 20 | 30 | 40 | 60 | 80 | 100 | 200 |
| 3 | 1.6667 | 3 | 6 | 15 | 30 | 45 | 60 | 90 | 120 | 150 | 300 |
| 5 | 1 | 5 | 10 | 25 | 50 | 75 | 100 | 150 | 200 | 250 | 500 |
How it works
Each cell is units = target amount in mg / concentration x 100, where concentration = vial mass / water volume. For 5 mg in 2 mL the concentration is 2.5 mg/mL, so a 250 mcg example amount is 0.25 / 2.5 x 100 = 10 units.
Frequently asked questions
What does a 250 mcg example amount of KPV read on a U-100 syringe for a 5 mg vial?
It depends on the water volume: 5 units with 1 mL, 10 with 2 mL, 15 with 3 mL and 25 with 5 mL in a 5 mg vial.
Why do the chart rows differ for the same 5 mg of KPV?
More water lowers the concentration, from 5 mg/mL at 1 mL to 1 mg/mL at 5 mL, so the same target amount occupies more volume and reads more units.
How many mcg of KPV does one syringe unit hold in this vial?
One unit is 0.01 mL. At 2.5 mg/mL (the 2 mL row) one unit holds 25 mcg of KPV.