Blood pressure is usually measured on the arm during routine health check-ups. However, blood pressure can also be measured around the ankle, and comparing the readings from the arm and leg can provide an indication of possible problems with blood flow in the arteries.
This comparison can be carried out using a blood pressure monitor, including a home device. However, the result should only be considered an indication and not a definitive diagnosis of an arterial blockage.
How to Measure Blood Pressure in the Leg
To compare the readings, first measure your blood pressure on your arm and record the result. Taking two readings is suggested.
Next, place the blood pressure cuff around the leg above the ankle and take another reading using the same machine. Record both measurements so they can be compared.
For this calculation, the systolic blood pressure, which is the upper number in a BP reading, is used. The diastolic or lower number is not included.
What the Arm-to-Leg BP Ratio Can Indicate
The systolic reading from the ankle is divided by the systolic reading from the arm. According to the information provided, a ratio between 1.0 and 1.3 falls within the normal range.
A result above 1.4 may be associated with stiff or calcified arteries, while a reading below 0.9 may indicate a possible narrowing or blockage in the arteries.
This type of comparison can therefore provide an indication of whether further medical evaluation may be needed.
What Does a Lower Leg BP Reading Mean?
When blood pressure measured at the leg is significantly lower than the reading from the arm, it can be a possible sign of reduced blood flow caused by an arterial blockage.
However, the test cannot by itself confirm or completely rule out an artery blockage. Even a reading within the normal range does not necessarily exclude every possible circulation problem.
If the result falls below the suggested range, it is important not to ignore it. A doctor can assess the reading along with other factors and determine whether further evaluation is required.
Disclaimer: The information provided in this article is intended for general awareness only and should not be considered medical advice or a substitute for professional diagnosis. Blood pressure readings can vary, and home measurements should not be used to confirm or rule out an arterial condition on their own. Consult a qualified healthcare professional if you have concerns about your blood pressure, circulation or any other health condition.