53 lines
2.5 KiB
C#
53 lines
2.5 KiB
C#
public static class PlausibilityValidator
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{
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// Plausible ranges define the outer boundary of physically possible values.
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// These are NOT clinical alert thresholds — they catch device malfunctions,
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// transcription errors, and misread handwriting from paper charts.
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// A heart rate of 300 is clinically extreme but not impossible during VT;
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// 400 is physically impossible and indicates a data entry mistake.
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private static readonly Dictionary<string, (decimal Min, decimal Max)> _ranges = new()
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{
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["HEART_RATE"] = (1, 300), // beats per minute; ceiling allows extreme tachycardia (e.g. VT)
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["TEMP_C"] = (15, 50), // core body temperature in °C
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["POTASSIUM_MEQ_L"] = (0.1m, 12), // serum potassium mEq/L; catches decimal misplacement (5.2 vs 52)
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["SPO2"] = (50, 100), // peripheral oxygen saturation %
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["RESP_RATE"] = (1, 80), // respirations per minute
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["WBC_K_UL"] = (0.1m, 500), // white blood cell count ×10³/µL
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["GLUCOSE_MG_DL"] = (10, 1000), // blood glucose mg/dL
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["LACTATE_MMOL_L"] = (0.1m, 30), // blood lactate mmol/L
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["BP_SYSTOLIC"] = (40, 300), // systolic blood pressure mmHg
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["BP_DIASTOLIC"] = (20, 200), // diastolic blood pressure mmHg
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};
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/// <summary>
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/// Returns true if the value falls within the plausible range for the given code.
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/// Unknown observation codes pass plausibility — the code is validated elsewhere.
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/// </summary>
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public static bool IsPlausible(string observationCode, decimal value, out string? reason)
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{
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if (!_ranges.TryGetValue(observationCode, out var range))
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{
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// Unknown codes pass plausibility — the observation code itself
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// is validated at the business rule layer, not here.
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reason = null;
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return true;
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}
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if (value < range.Min || value > range.Max)
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{
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reason = $"Value {value} is outside the plausible range " +
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$"[{range.Min}–{range.Max}] for {observationCode}.";
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return false;
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}
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reason = null;
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return true;
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}
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/// <summary>
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/// Returns all known observation codes and their plausible ranges.
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/// Used by the frontend to display valid input boundaries.
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/// </summary>
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public static IReadOnlyDictionary<string, (decimal Min, decimal Max)> GetAllRanges() =>
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_ranges;
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} |