Reconstitution math and readable syringe marks
Pick the water volume before you pick the syringeReconstitution is one division, and the whole thing goes wrong at the syringe rather than in the arithmetic.…
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Pick the water volume before you pick the syringeReconstitution is one division, and the whole thing goes wrong at the syringe rather than in the arithmetic.…
syringe size default.
0.3.
0.3 mL.
marked to 30 units.
A 0.3 mL syringe.
because the marks are crowded there and small errors get easier to make.
Step up to the full 1 mL size only if you genuinely need the volume.
A 0.5 mL syringe is fine up to 50 units.
the right default when your draws stay under 30 units.
Pick the water volume before you pick the syringeReconstitution is one division, and the whole thing goes wrong at the syringe rather than in the arithmetic.…
Pick the water volume before you pick the syringeReconstitution is one division, and the whole thing goes wrong at the syringe rather than in the arithmetic.…
Pick the water volume before you pick the syringeReconstitution is one division, and the whole thing goes wrong at the syringe rather than in the arithmetic.…
None of this is medical advice. It is arithmetic and record keeping.
A log row that says "12 units" is worthless six weeks later if you have re-mixed at a different concentration since. Record the date and time,…
Log the concentration, not just the units
Add the water slowly down the inner wall of the vial. Do not jet it onto the powder and do not shake it. Swirl gently until…
Handling
Syringe size
Notice that a 5 mg vial in 2 mL and a 10 mg vial in 4 mL both give 2.5 mg/mL and behave identically at the…
Choose the reconstitution volume so that your ordinary dose lands on a mark you can actually read. A dose that works out to 2.3 units is…
The part people skip
U-100 syringes are marked in insulin units, not millilitres. The conversion never changes: 100 units = 1 mL, so 1 unit = 0.01 mL. That means…
Reading a U-100 syringe
A 5 mg vial with 2 mL of bacteriostatic water is 2.5 mg/mL. A 0.25 mg dose is 0.25 / 2.5 = 0.1 mL. On a…
Worked example
volume to draw (mL) = dose (mg) / concentration (mg/mL)
Then the draw:
concentration (mg/mL) = vial strength (mg) / water added (mL)
Reconstitution is one division, and the whole thing goes wrong at the syringe rather than in the arithmetic. A lyophilised vial holds a stated mass. You…