ABI Calculator

Formula

The formula to calculate the Ankle-Brachial Index (ABI) is:

\[ \text{ABI} = \frac{\text{BPankle}}{\text{BParm}} \]

Where:

\( \text{ABI} \) is the Ankle-Brachial Index
\( \text{BPankle} \) is the blood pressure in the ankle (mmHg)
\( \text{BParm} \) is the blood pressure in the arm (mmHg)

What is the Ankle-Brachial Index (ABI)?

The Ankle-Brachial Index (ABI) is a simple, non-invasive test that compares the blood pressure measured at your ankle with the blood pressure measured at your arm. The ABI score can help indicate the risk of peripheral artery disease (PAD). A lower ABI value can suggest narrowing or blockage of the arteries in the legs, which is a common condition in PAD.

Example Calculation

Let's assume the following values:

Blood Pressure in the Ankle (BPankle) = 120 mmHg
Blood Pressure in the Arm (BParm) = 140 mmHg

Using the formula to calculate the Ankle-Brachial Index (ABI):

\[ \text{ABI} = \frac{120}{140} \approx 0.86 \]

The Ankle-Brachial Index (ABI) is approximately 0.86.