FA-64024 / Medication dosing calculations / Member archive

Weight-based anticoagulant infusion nomogram: bolus hundred-unit rounding · case 04

A 3250 unit bolus is drawn up as 3200 units.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Input {weight_kg, aptt (integer seconds), rate (units/kg/h)}. Toy nomogram with dosing weight capped at 120 kg: aptt < 35 bolus 80 u/kg and rate +4; 35-45 bolus 40 u/kg and rate +2; 46-70 no change; 71-90 rate -2; > 90 hold 60 minutes and rate -3. Rate is never below 0. Bolus units = bolus u/kg * weight rounded half-up to the nearest 100 units. Return {bolus_units, hold_min, rate_u_kg_h, rate_u_h (half-up integer of rate*weight)}.

Why this case matters

Nomogram-driven infusion adjustments combine band lookup, weight caps and pump rounding; each is a separate failure point.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
aptt exactly 35	`{"bolus_units": 2500, "hold_min": 0, "rate_u_h": 1280, "rate_u_kg_h": 20.0}`	`{"bolus_units": 2600, "hold_min": 0, "rate_u_h": 1280, "rate_u_kg_h": 20.0}`	Failed

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