Evaluate a prolonged aPTT and detect specific coagulation factor XII activity
To avoid delays in turnaround time when requesting multiple tests on frozen samples, submit a separate frozen aliquot for each test requested.
aPTT-based one-stage clotting time assay. Factor XII-depleted plasma is used as the substrate and the clotting time with the patient plasma is compared to the clotting time of normal pooled plasma.
50 - 150%