PhlebotomyQuestion 56 of 100
A green-top tube is used for many chemistry (plasma) tests. Which additive does it contain?
a.EDTA
b.Sodium citrate
c.Silica clot activator
d.Heparin
Explanation
The green-top tube contains heparin (sodium, lithium, or ammonium), an anticoagulant that inhibits thrombin to prevent clotting for plasma chemistry tests. It is inverted several times to mix. Choosing the correct additive tube ensures the specimen is suitable for the ordered test.
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