Medical Assistant Certification (MAC) AMCA Practice Exam

What should a medical assistant do if a lavender tube is not available but a CBC is ordered?

1. Use a red top tube

2. Use a light blue top tube

3. Contact the physician for alternative testing

4. Use a green top tube

The correct answer is: Contact the physician for alternative testing

When a lavender tube is required for a complete blood count (CBC) and it is not available, the best course of action is to contact the physician for alternative testing. The lavender tube contains EDTA, an anticoagulant that prevents blood clotting and preserves the integrity of the blood cells for accurate analysis in a CBC. Without this specific tube, the results of the test could be compromised, leading to inaccurate interpretations and possible misdiagnosis. Seeking guidance from the physician allows for clarifying how to proceed with the test while ensuring patient safety and obtaining accurate results. The physician may suggest alternative testing methods, including the use of appropriate tubes or different diagnostic tests that could provide similar information without compromising the quality and accuracy of the results. This ensures that the patient's care is not delayed or jeopardized due to equipment availability issues. Using other types of tubes, such as red, light blue, or green, would not provide the necessary conditions for conducting a CBC, as they are designed for different purposes, which do not align with the requirements of a CBC. Thus, contacting the physician reflects a commitment to high standards in patient care and laboratory accuracy.