The role of light green, purple, light blue, black, gray cap blood collection tubes

1. Light green cap blood collection tube
Plasma separation tube, adding heparin lithium anticoagulant to the inert separation rubber tube, can achieve the purpose of rapid separation of plasma, is the best choice for electrolyte testing, and can also be used for routine plasma biochemical testing and emergency plasma biochemical testing such as ICU.
2. Purple cap blood collection tube
EDTA anticoagulation tube, the anticoagulant is ethylenediaminetetraacetic acid (EDTA), which can combine with calcium ions in the blood to form a chelate complex, so that Ca2+ loses its coagulation effect, thereby preventing blood coagulation. Suitable for multiple hematology tests. However, EDTA affects platelet aggregation and is not suitable for coagulation tests and platelet function tests, nor for calcium ion, potassium ion, sodium ion, iron ion, alkaline phosphatase, creatine kinase and PCR tests.
3. Light blue cap blood collection tube
Sodium citrate anticoagulation tube, sodium citrate plays an anticoagulant effect mainly by chelating calcium ions in blood samples. Suitable for coagulation tests.
4. Black cap blood collection tube
Sodium citrate ESR test tube, the sodium citrate concentration required for ESR test is 3.2% (equivalent to 0.109mol/L), and the ratio of anticoagulant to blood is 1:4.
5. Grey cap blood collection tube
Potassium oxalate/sodium fluoride, sodium fluoride is a weak anticoagulant, usually used in combination with potassium oxalate or sodium ethiodate, the ratio is 1 part of sodium fluoride and 3 parts of potassium oxalate. It is an excellent preservative for blood glucose measurement. It cannot be used for the determination of urea by urease method, nor for the determination of alkaline phosphatase and amylase. It is recommended for blood glucose detection.