Brenda, in coag, I'm using Statspin, which is a small centrifuge, that spins for 3mins at ?g. Running the plasma under our FBC analyser, I can get between 2-7x10^9/L which I think is very efficient considering the time we spin, and the result we get. For a high workload blood bank, this could be a godsend. It's just that the centrifuge seems filmsy and is very sensitive to balance... And I would avoid using rpm as much as possible unless I'm talking about cars. Personally I dismiss this unit as it do not mean anything considering the various length of rotors in the market. Scott, I understand what you mean. Thanks. I believe I made the right choice by moving on.