FA-64063 / Medication dosing calculations / Member archive

Vial reconstitution, draw volume and waste: draw volume rounding · case 03

A 2.25 mL requirement is drawn as 2.2 mL.

Member previewVariant 3 · 3 implementations · 7 checks per implementation

Case contract

Input {dose_mg, vial_mg, diluent_ml, displacement_ml, single_use}. Concentration = vial_mg/(diluent_ml + displacement_ml). Draw volume = dose/concentration, rounded half-up to 0.01 mL when the volume is <= 1 mL, else to 0.1 mL. Vials = ceil(dose/vial_mg). Waste = vials*vial_mg - dose for single-use vials, else 0. Return {conc_mg_ml (4 dp), draw_ml, vials, waste_mg}.

Why this case matters

Reconstitution calculators must account for powder displacement and syringe graduations; vial counts and waste accounting are separate rules.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
draw volume half step rounds up	`{"conc_mg_ml": 20.0, "draw_ml": 2.6, "vials": 1, "waste_mg": 0.0}`	`{"conc_mg_ml": 20.0, "draw_ml": 2.7, "vials": 1, "waste_mg": 0.0}`	Failed

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