NHA Phlebotomy Certification Practice Exam

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What color of tube is used for activated partial thromboplastin time?

Light blue
Light green
Purple
Yellow

The correct answer is: Light blue

The light blue tube is specifically designed for coagulation tests, including activated partial thromboplastin time (APTT). This tube contains sodium citrate as an anticoagulant, which helps to preserve the blood sample for accurate analysis of coagulation factors. The sodium citrate works by binding calcium ions in the blood, which is essential for blood clotting. By using the light blue tube, healthcare professionals can obtain reliable results when assessing the patient's coagulation pathway, especially the intrinsic pathway. Other colored tubes contain different additives that serve other purposes, such as promoting clotting, preserving serum, or facilitating specific tests. However, for tests related to coagulation, including APTT, the light blue tube is the appropriate choice due to its anticoagulant properties.