Cell Count, Serous Fluid
Collect lavender EDTA or green top heparin/1-2 mL fluid. Follow standard collection procedures. Heparin should be added to the syringe used for aspiration of pleural or pericardial fluid to prevent clotting.
Microscopic and macroscopic examination
Room temp: Unacceptable, Refrigerated: 48 hours, Frozen: Unacceptable
Evaluate serous fluid for the presence of RBCs (semiquantitative), WBCs, differential, and for physical appearance.
See test code SFCT if testing synovial fluid.