Which finger should not be used to measure pulse and why?

The thumb should not be used to measure pulse because it has its own pulse that can be easily felt, which can lead to confusion when trying to assess the pulse of another individual. Using the thumb may result in mistakenly detecting the pulse of the thumb itself instead of the pulse of the patient being assessed, thereby providing inaccurate results. This is critical when performing pulse assessments, as accuracy is essential for proper medical evaluation.

The other fingers may have their own characteristics that affect pulse measurement, but they do not have the same intrinsic pulsing that the thumb has, making them more suitable for this task. Therefore, the thumb's pulsation interferes with reliable pulse measurement, rendering it unsuitable for this purpose.