INTRODUCTION: Proper utilization of plasma control for comparison with the plasma of patients with coagulation tests is critical to ensure a safe outcome of these laboratory tests. OBJECTIVE: The purpose of this work was to know if in-house preparations of polled plasma can be used as a normal control of partial thromboplastin time (PTT). MATERIAL AND METHOD: We make two polled plasma, one with five (P5) samples and another with 20 (P20) samples, both of them from normal patients. Both pooled plasma were analyzed in comparison with a commercial lyophilized control (AP). The experiment was performed in 10 days, and P5 and P20 were made daily. At each day PTT was performed for P5, P20 and AP. All patients who asked for TTP, in each day of this experience, got a time relation (R) determined by a P5, P20 e AP. Tukey test was used as statistical analysis. RESULTS: Statistically significant differences were detected among the PTT for AP and P5, AP and P20, but no difference between P5 and P20 was observed. When the time relations were tested, there were no significant difference, among AP, P5, and P20. CONCLUSION: We found that in-house preparations of polled plasma (P5 and P20) can be used as a normal control of PTT.
Partial thromboplastin time; In-house preparations of pooled plasma; Quality control
