What instrument is commonly used to test temperature sensation?

• A. Tuning fork under running water
• B. Cotton wisp
• C. Pin
• D. Monofilament

Answer: (A)

Testing temperature sensation relies on delivering a controlled thermal stimulus that the patient can reliably perceive. A tuning fork is metal and conducts heat efficiently, so when you run it under cold or warm water and apply it to the skin, the temperature change is quickly and consistently transmitted to the skin surface. The continuous water stream helps maintain a steady temperature during testing, making it easier to determine whether the patient can discern warm versus cold. In contrast, a cotton wisp tests light touch, a pin tests sharp pain, and a monofilament assesses protective sensation, not temperature.