The blood sample should be centrifuged immediately and the plasma removed from the blood cells. It is common to use microtainer collection tubes of lithium heparin, which contain plasma separators.

Centrifuges may be used in laboratories ... in medical laboratories for separating plasma or serum from blood samples.

EKF Diagnostics’ HemataStat II™ is a microhematocrit centrifuge that provides a quantitative hematocrit reading for up to six blood samples from one 60 second spin. Hematocrit is the volume ...