Lavender Top Tube
(1) Chemistry for carcinoembryonic antigen (CEA), lead, rennin
(2) Haematology to measure parameters requiring separated cells—e.g., white cells, red cells—haematocrit, haemoglobin, MCV, MCH, MCHC, differential counts, sedimentation rate, glucose-6-phosphate dehydrogenase, sickle cell preparation, haemoglobin electrophoresis, platelet counts, reticulocyte counts