FA-63853 / Medication dosing calculations / Member archive

Weight-based dose with ideal and adjusted dosing weight: obesity band threshold · case 03

Patients a few kilograms over ideal weight are dosed on an adjusted weight instead of ideal weight.

Member previewVariant 3 · 3 implementations · 9 checks per implementation

Case contract

Input {sex, height_in, weight, unit ("kg" or "lb", 1 kg = 2.2 lb), mg_per_kg, max_mg}. Toy rule: IBW = 50 kg (sex "M") or 45.5 kg (otherwise) + 2.3 kg per inch above 60 in (never below the base). Dosing weight is actual weight when below IBW, IBW when actual is within 100-120% of IBW inclusive, and IBW + 0.4*(actual-IBW) when actual exceeds 120% of IBW. Dose = mg_per_kg * dosing weight rounded half-up to the nearest 5 mg, then capped at max_mg. Return {basis, dosing_weight_kg (1 decimal), dose_mg}.

Why this case matters

Weight-based ordering tools must choose the stipulated dosing weight band, convert units exactly, and apply the ceiling after the final rounding step.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
short stature keeps base ideal weight	`{"basis": "adjusted", "dose_mg": 50, "dosing_weight_kg": 48.5}`	`{"basis": "ideal", "dose_mg": 45, "dosing_weight_kg": 45.5}`	Failed

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