Certified Clinical Medical Assistant Exam Practice Question

Correct Answer: C

Rationale: Oxygen saturation measurement can be influenced by various external factors. Fingernail polish can obstruct the light sensors in pulse oximeters, leading to inaccurate readings.

In contrast, poor exercise habits (A) do not directly affect the measurement itself, though they may impact overall health. Dirty hands (B) may introduce bacteria but typically do not interfere with the oximeter's function. Drinking a hot beverage (D) can temporarily alter blood flow but is unlikely to significantly impact oxygen saturation readings. Thus, fingernail polish is the most relevant factor affecting accuracy.