Forearm or thigh BP measurement is used when upper arm measurement is contraindicated.

• A. For routine checks in healthy adults
• B. When a cuff is unavailable on the upper arm
• C. When the patient is asleep
• D. When the clinic is very busy

Answer: (B)

Measuring blood pressure at a standard site (the upper arm) is chosen because its values are well established and the technique is straightforward. When that site can’t be used, an alternative like the forearm or thigh is used to obtain a reading and continue monitoring. This is necessary in practical terms when the upper arm is inaccessible or a cuff isn’t available for that arm, so you still need a BP reading without delaying care. Remember that readings from the forearm or thigh can differ from arm readings due to different arterial paths and hydrostatic effects, so ensure the limb is positioned correctly at heart level and use an appropriately sized cuff. If the exam focuses on when to use these sites, the practical trigger is the lack of a usable upper-arm cuff, making forearm or thigh measurement the appropriate option.