Red cell phenotyping using hexadimethrine bromide (Polybrene) in a microplate system

Polybrene technique for red cell antibody screening using microplates

The manual polybrene technique was adapted as a microplate test for antibody screening to determine its sensitivity and specificity and compared with conventional tube testing using various antibodies and serologically inert sera. Equivalent results were obtained for both techniques and it is concluded that this adaptation of the polybrene technique is useful in pretransfusion testing.

Application of network planning methodology to workflow analysis in a reference laboratory

Efficient organization of the workflow in a reference laboratory is essential to timely resolution of serological problems. This study investigated the usefulness of network planning methods to streamline workflow in a blood center reference laboratory. The investigation of a patient serological problem which included a positive direct antiglobulin test was chosen for analysis. Individual steps in the resolution process were identified. All possible logical sequences of these steps were investigated to determine which steps were along the 'critical path', the sequence of steps which is rate-limiting. By implementing new procedures for these steps, faster resolution of a problem should result. The Program Evaluation Review Technique predicted that altering procedures to shorten 3 steps (autoadsorption, antibody identification panel at 37 degrees C and screening for antigen-negative units) would result in a decrease in the time required to complete a patient problem by 29%. Time-motion studies documented a 35% improvement in problem resolution time with the new procedures (p greater than 0.05). Utilization of the network planning techniques in an immunohematological laboratory may allow for more efficient and expedient operation.