Light blue
A lavender/purple top tube is typically used to draw blood for a hematocrit test. This tube contains the anticoagulant EDTA, which helps prevent the blood from clotting during testing.
A lavender tube is typically used for a complete blood count (CBC), which includes hemoglobin and hematocrit measurements. These measurements are part of the "h and h" test.
leukocytes and platelets
serum,tiger tube
Platelets and white blood cells
I would use the semi-colored tube.
green
a lavender top tube
red
red
blue
If the hematocrit is sealed at the end of the tube toward the outside of the centrifuge rack, this ensures that the hematocrit is properly centrifuged with the red blood cells compacted at the bottom. This positioning helps in accurate measurement of the packed cell volume, which is an essential parameter in assessing the patient's blood composition.