Phlebotomy Technician Practice Exam (NCPT/CPT)

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What is the order of draw for a PTT and a H&H?

Lavender and Light blue

Light blue and Lavender

PTT (Partial Thromboplastin Time) and H&H (Hemoglobin and Hematocrit) are both commonly collected by using evacuated tubes. The order of draw refers to the sequence in which blood is drawn from the patient into different tubes. It is important to follow the correct order of draw to ensure accurate and reliable test results.

Option B, Light blue and Lavender, is the correct order of draw for collecting PTT and H&H. Light blue is used for coagulation tests such as PTT and Lavender is used for hematology tests like H&H. These tubes contain different additives that can affect the test results if drawn in the wrong order.

Option A is incorrect because Lavender should be drawn before Light blue to prevent any contamination from the anticoagulant in the Light blue tube.

Option C is incorrect because SST (Serum

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SST and Light blue

Light blue and Yellow

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