FA-63899 / Medication dosing calculations / Member archive

mcg/kg/min infusion converted to pump mL/h: milligram to microgram concentration · case 04

Pump rates come out a thousand times too high and most orders are rejected as exceeding the pump.

Member previewVariant 4 · 3 implementations · 7 checks per implementation

Case contract

Input {dose (mcg/kg/min), weight_kg, drug_mg, bag_ml}. Concentration = drug_mg*1000/bag_ml mcg/mL. Rate mL/h = dose*weight*60/concentration, rounded half-up to 0.1 mL/h. Pump accepts 0.1-999.9 mL/h: a rounded rate above 999.9 returns status EXCEEDS_PUMP, a rounded rate of 0.0 returns BELOW_RESOLUTION; otherwise status OK with rate_ml_h. conc_mcg_ml is always reported.

Why this case matters

Weight-based infusion programming is a classic unit-conversion fault surface: mg vs mcg, per-minute vs per-hour, and pump resolution limits.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
standard adult infusion	`{"conc_mcg_ml": 1.6, "status": "EXCEEDS_PUMP"}`	`{"conc_mcg_ml": 1600.0, "rate_ml_h": 13.9, "status": "OK"}`	Failed

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