Source:http://linkedlifedata.com/resource/umls/id/C3274476
NCI: The determination of the ratio of a subject's partial thromboplastin time to a standard or control partial thromboplastin time. The measurement may be expressed as a ratio or percentage.,NCI: A relative measurement (ratio or percentage) of the subject's partial thromboplastin time to a standard or control partial thromboplastin time.