Why So Many Tubes at a Blood Draw?

why so many tubes

Q: Why do phlebotomists fill so many tubes of blood? 🩸

A: Because different tests require different collection tubes. Each tube color indicates specific additives. A lavender-top tube holds EDTA, an anticoagulant that keeps blood from clotting CBC test . A gold-top tube holds a clot activator and gel that lets the serum be separated for many chemistry and immunology tests. And a light blue-top tube holds citrate for clotting studies.
Every tube has a specific job, and one tube can often cover several tests.

Curious about your draw? Our phlebotomists are happy to walk you through it at your next visit!

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