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Bench tools · No. 04

Doses per vial, honestly.

What the vial actually yields.

Doses counted from what the barrel can deliver, not from the number you asked for. Then the diluent volumes that would do better.

The vial
mg
mL
The hardware
Barrel scale1u = 0.01 mL
Barrel holdsunits
Vial holdsmL
YIELD
5 mg/mL · 50 mcg per unit
You can draw
25doses
4 units each, delivering 200 mcg
Every draw is off
220 mcg wants 4.40 units, which is not a mark. Every draw is under by 20 mcg, or 9.1%. A different diluent volume fixes this.
The whole vial
Concentration5 mg/mL
Exact draw for the target4.40 u
Draw you can read4 u
Delivered per dose200 mcg
Deviation from target-9.1%
Doses in the vial25
Residual0 mg · 0 mL
Stranded0%
Diluent volumes worth using
DiluentDrawDosesOff targetStranded
2.50 mL11 u22exact3.2%
1.59 mL7 u22exact3.1%
0.91 mL4 u22exact3.3%
2.53 mL11 u23-1.19%0%
1.15 mL5 u23-1.19%0%
1.61 mL7 u23-1.19%0%

Exact volumes first, then the ones giving the most doses. More doses is not always the better plan: a volume that yields one extra dose while every draw runs short is worse than one that hits the target, which is why both columns are here rather than a single score.

Figures describe solution chemistry only. Nothing here is a protocol, a schedule, or a recommendation, get your target from a licensed provider.

For a single draw with the barrel drawn to scale, use the reconstitution calculator. To read a solution you already have in either direction, use the concentration converter.

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