Accurate filling of specimen tube is essential.
Due to a small specimen viability window, patients for this test should be booked close to the courier runs.
Specimens must be stored at room temperature and transported to Laboratory ASAP. (Maximum delay to testing laboratory must not exceed 1hr)

Both PT and aPTT will be NORMAL in patients with F XIII deficiency. Acquired F XIII deficiency is usually because of inhibitory antibodies that develop against F XIII - such antibodies have been reported in association with INH, penicillin, and phenitoin; they may also be idiopathic. Decreased F XIII levels have been described in patients with Henoch-Schonlein purpera, Crohn's disease, and ulcerative colitis. Diagnosis of F XIII deficiency can be made with a simple clot solubility test.