Phlebotomy第 55 / 100 题
A lavender-top (purple) tube is required for a complete blood count (CBC). Which additive does it contain?
a.Sodium fluoride
b.Sodium citrate
c.EDTA
d.Sodium heparin
解析
The lavender-top tube contains EDTA, an anticoagulant that binds calcium and preserves the shape of blood cells, making it ideal for hematology tests such as the CBC. It must be gently inverted several times after collection to mix the additive. Clots form if it is not mixed, invalidating the sample.
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