Capillary refill time is used to assess which physiological aspect?

• A. Capillary refill time is used to assess circulatory health and blood pressure
• B. CRT measures respiratory rate
• C. CRT measures blood sugar
• D. CRT assesses nervous system function

Answer: (C)

Capillary refill time measures peripheral perfusion, reflecting how well blood is reaching the small vessels in the skin and thus indicating circulatory status and cardiac output to the extremities. After pressing on a nail bed or skin to blanch it, the speed at which color returns shows the adequacy of blood flow to that area. A normal, quick refill suggests adequate perfusion, while a delayed refill points to reduced peripheral blood flow, which can occur with dehydration, hypovolemia, or shock. This test does not assess respiratory rate, blood glucose, or nervous system function, so those aspects are not what capillary refill time indicates. Be mindful of factors like ambient temperature, age, and nail polish, which can influence the reading.