Evaluation of a Blood Coagulation Factor XIII Assay Kit

Methods: We evaluated the linearity and precision of the new FXIII test kit and compared the results of the new kit and the Pefakit FXIII assay. The FXIII was tested in idiopathic thrombocytopenic purpura (ITP) (n=40) patients, chronic renal failure (CRF) (n=20) patients, liver cirrhosis (LC) (n=40) patients, EDTA-induced pseudothrombocytopenia (EDTAIP) (n=10) patients, and in normal healthy persons (n=50). In the normal healthy persons, we determined a complete blood count (CBC), Ed-highlight-the second (n=50) is redundant. prothrombin time (PT) measurement and activated partial prothrombin time (aPTT) measurement and evaluated the results using the two assays. Results: Serial dilution experiments with five samples provided good linearity (r2 =0.9717). The intra- and inter assay precisions (CV) were 2.3∼8.6% and 3.9∼14.9%, respectively (n=20). There was a signi- ficant correlation between the use of the new kit and the Pefakit FXIII assay (r=0.8798, n=50). The FXIII activities of the normal healthy persons, ITP, CRF, LC and EDTAIP patients were 103.3±23.3%, 79.7± 41.0%, 117.9±82.3%, 56.9±23.7% and 130.0±29.0%, respectively and they were significantly decreased in the ITP and LC patients (P<0.05). The rates below 80% of the FXIII level were 67.5% in the ITP patients, 90.0% in the LC patients, 35.0% in the CRF patients and 0.0% in the EDTAIP patients. FXIII activities were closely related to platelet count (r=0.832, P<0.05) and negatively correlated with PT (r= 0.389, P<0.05) and aPTT (r= 0.326, P<0.05). Conclusion: The new kit was determined to have good linearity and precision. Moreover, it was simple and rapid to perform. This method may prove useful for the evaluation of FXIII. (Korean J Hematol