What is the correct draw order when a complete blood count (CBC) and a PT are ordered?

a. Discard tube, purple top, blue top
b. Blue top, lavender top
c. Lavender top, blue top
d. Green top, lavender top

ANS: B
When drawing blood for both a CBC (purple top) and PT (blue top), the blue top should be drawn before the purple top. Drawing them in the reverse runs the risk of contaminating the blue top tube with ethylenediaminetetraacetic acid (EDTA), which will invalidate the PT result.

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