Glossary

Thrombocyte

A thrombocyte is a platelet. Platelets are the cellular component that PRP concentrates, and they carry the growth factors that make platelet concentrates clinically interesting. They are also the least dense cellular component of blood, which is why excessive centrifugal force damages them rather than concentrating them further.

Figure

The least dense cells

DENSITY · KG PER CUBIC METRE Plasma 1,025 Platelets 1,040 to 1,060 Leukocytes 1,050 to 1,085 Erythrocytes 1,090 to 1,100 Denser fractions sediment faster. That gap is the entire basis of separation.

Figure. Platelets are the lightest cellular fraction, which is why excessive force damages rather than concentrates them. At high g they are driven into the pellet along with everything denser.

In practice

Platelets are the least dense cellular component of blood, which is why excessive force damages them: at high g they are driven into the pellet along with denser cells.

See also