export interface FetalBiometryInput {
    /** Biparietal diameter, mm. */
    bpdMm?: number | null;
    /** Head circumference, mm. */
    hcMm?: number | null;
    /** Abdominal circumference, mm. */
    acMm?: number | null;
    /** Femur length, mm. */
    flMm?: number | null;
}
/** Which Hadlock regression produced the estimate. */
export type EfwMethod = 'hadlock4' | 'hadlock1';
export interface EfwResult {
    /** Estimated fetal weight, grams (rounded to the nearest gram). */
    grams: number;
    /** The Hadlock regression used, given the available measurements. */
    method: EfwMethod;
}
/**
 * Estimate fetal weight from biometry. Uses the Hadlock 4-parameter formula
 * when BPD, HC, AC and FL are all present, else the AC+FL formula. Returns
 * `null` when AC and FL (the minimum) aren't both available.
 */
export declare function estimateFetalWeight(input: FetalBiometryInput): EfwResult | null;
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