Which test requires a patient to be in the supine position?

For certain medical tests, the patient's position can significantly affect the accuracy and safety of the procedure. The electrocardiogram (EKG) is one such test where the patient's body position is critical. The EKG requires the patient to be in the supine position so that the electrodes can establish a proper connection to the skin while minimizing movements that could interfere with the recording of the heart's electrical activity.

When the patient is supine, this position allows for a more stable and relaxed state, which is essential for obtaining precise readings of the heart's rhythm and function. Other tests listed, such as a complete blood count, urinalysis, or lipid panel, can be performed with the patient in various positions without significant impact on the results. Therefore, the supine position is specifically needed for the accuracy and reliability of the EKG test.