After getting systolic blood pressures, you divide the highest of the arm pressures by the ankle pressure for each side to get the ABI for each side of the body. In addition, you should have a vascular specialist interpret your ABI study for validation. Also, if a patient’s ABI is over 1.4, or you are having trouble getting a blood pressure, especially with diabetic patients, you may need to consider other diagnostic data to evaluate.
Sounds complicated? See below for a solution that greatly simplifies the process.