CPT® Code 85244

The CPT® Code 85244 refers to a laboratory test that measures the level of factor VIII related antigen in the blood. Factor VIII is a crucial protein that plays a significant role in the blood clotting process. A deficiency in this protein is often linked to Hemophilia A, a genetic disorder that primarily affects males due to its X-linked inheritance pattern. Hemophilia A can manifest in varying degrees of severity based on the percentage of factor VIII present in the blood. The severe form, characterized by less than 1% of normal factor VIII levels, occurs in approximately 60% of cases, while the moderate form (1-5% factor VIII) is seen in about 15% of cases, and the mild form (6-30% factor VIII) in roughly 25% of patients. Individuals with mild hemophilia typically experience bleeding only in response to significant injuries, whereas those with moderate hemophilia may have spontaneous bleeding episodes, particularly in joints and soft tissues. In contrast, individuals with severe factor VIII deficiency are at risk for spontaneous bleeding under various circumstances. The factor VIII related antigen test is instrumental in evaluating the effectiveness of factor VIII replacement therapy, determining carrier status in potential hemophilia cases, and identifying patients who may exhibit cross-reactive positivity (CRP). The test is performed on a blood sample obtained through venipuncture, which is a separately reportable procedure, and the analysis is conducted using immunoassay techniques.