Which measurements are used to assess subcutaneous fat and muscle mass?

• A. Body mass index and waist circumference
• B. Serum albumin levels
• C. Tricep skinfold, mid-arm circumference, and hand grip strength
• D. Blood pressure

Answer: (C)

Assessing body composition requires combining measurements that reflect fat stores with those that reflect muscle mass and function. The tricep skinfold provides a direct estimate of subcutaneous fat thickness, giving insight into fat stores in the limb. The mid-arm circumference indicates the overall size of the upper arm, and when interpreted with skinfold data can help estimate lean mass or muscle mass in that region. Hand grip strength adds a functional dimension, representing muscle strength and overall muscle quality, which correlates with total lean mass and nutritional status. Together, these measures capture both fat and muscle components, making them the most informative trio for this purpose.

BMI and waist circumference quantify general or central adiposity but not subcutaneous fat thickness or muscle mass specifically. Serum albumin reflects protein status and inflammation rather than body composition per se. Blood pressure is cardiovascular in nature and not a direct measure of fat or muscle.