def compute_score_for_coagulation(platelets_count: int) -> int:
    """
    Computes score based on platelets count (unit is number per microliter).
    """
    if platelets_count < 20_000:
        return 4
    if platelets_count < 50_000:
        return 3
    if platelets_count < 100_000:
        return 2
    if platelets_count < 150_000:
        return 1
    return 0