green top tube

A heparinized blood collection tube with a green stopper used to obtain blood for ammonia—collected on ice—carboxyhemoglobin and O2 saturation, cholinesterase, haemoglobin, methemoglobin, pH, histocompatibility testing—e.g., HLA-A, B, HLA-D—mixed lymphocyte culture, nitrotetrazolium blue (NBT) assay, phagocytosis, T- and B-cell studies and surface markers

green top tube

Lab medicine A heparinized blood collection tube with a green stopper used to obtain blood for ammonia, carboxyHb, O2 saturation, cholinesterase, Hb, methemoglobin, pH, histocompatibility testing–eg, HLA-A, B, HLA-D–mixed lymphocyte culture, NBT–nitrotetrazolium blue–assay, phagocytosis, T- and B-cell studies and surface markers