U-100 syringe measurement
Learn what the syringe markings mean and how to find the draw line shown on the calculator result.
0 of 6 steps5 min
Before this lesson, have these ready3 items
- A U-100 syringe with a readable scale and suitable capacity
- A checked calculator result showing the concentration and draw line
- A cleaned vial stopper and a sharps container
Check that the syringe is U-100
Make sure both the package and syringe say U-100.
Then check the syringe size, the numbered lines and how much each smaller line represents.
Before you continue
You know what the smallest line means and can confirm that 100 U-100 units equals 1 mL.
Stop conditions
Do not use U-100 calculations with another syringe type or assume every syringe uses the same spacing between lines.
Safety boundary
On a U-100 syringe, 100 units means 1 mL of liquid. The markings show liquid volume, not the amount of compound, unless the prepared concentration is also known.
Technique basis and sources
- CDC: Safe Injection Practices checklist
- FDA: Safe sharps disposal
- The syringe manufacturer’s scale and plunger-reading instructions