It think it really depends on the reasons why you need to have your femoral pulse checked. We used a combination of the fingers or a Doppler to check the flow of blood. Palpation of the pulses forms an important part of the assessment of the arterial blood supply of the lower limb. In clinical practice, this assessment may give clues about a compromised circulation.
We generally check with a Doppler following AAA ( Abdominal Aortic Aneurysm ) repair as there is a possibility of clot formation and blockage following surgery. Other conditions include intermittent claudication, a condition of the leg caused by atheroma (blockage) of the arteries. In this condition pain in the lower limb(s) develops during walking and is relieved by rest.
But whatever the reason for taking the pulse the rate, rhythm, and strength or amplitude of the pulse are noted and acessed. The average rate in an adult is between 60 and 100 beats per minute. The rhythm is checked for possible irregularities, which may be an indication of the general condition of the heart and the circulatory system.
The amplitude of a pulse can range from totally impalpable to bounding and full; however, such terms are vague and subject to misinterpretation. To provide a more standardized description of pulse amplitude we use a scale that provides a more objective evaluation and reporting of the force of a pulse.
On our scale zero would mean that the pulse cannot be felt; +1 would indicate a thready, weak pulse that is difficult to palpate, fades in and out, and is easily obliterated with slight pressure; +2 would be a pulse that requires light palpation but once located would be stronger than a +1; +3 would be considered normal; and a +4 pulse would be one that is strong, bounding, easily palpated, and perhaps hyperactive, and could indicate a pathological condition such as aortic regurgitation.