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Variable Results Reference Range Activated clotting time, seconds 424 70-150 Partial thromboplastin time, seconds 37.8 21.0-32.0 50.2 35.6 Prekallikrein activity, % <5 63-135 High molecular weight kininogen activity, % 153 65-135 Note: Prolonged activated clotting time was noted immediately prior to the initial planned surgical procedure. Partial thromboplastin time, prekallikrein activity, and high molecular weight kininogen activity were determined at subsequent hematology visits.