Hemolysis associated with pneumatic tube system transport for blood samples

Objective: the frequency of hemolysis of blood samples may be increased by transport in a pneumatic tube system. the purpose of this study was to evaluate the effect of pneumatic tube system transport on hemolysis of blood samples. methods: blood samples were transported from the emergency department to the hospital laboratory manually by hospital staff (49 patients) or with a pneumatic tube system (53 patients). the hemolysis index and serum chemistry studies were performed on the blood samples and compared between the different methods of transport. results: the blood samples that were transported by the pneumatic tube system had a greater frequency of hemolysis and greater mean serum potassium and median creatinine, aspartate aminotransferase, and lactate dehydrogenase levels than samples transported manually. conclusion: blood samples transported from the emergency department to the hospital laboratory by a pneumatic tube system may have a greater frequency of hemolysis than samples transported manually. this may necessitate repeat phlebotomy and cause a delay in completing the laboratory analysis.