Abi Calculator Machine

ABI Calculation:

\[ ABI = \frac{\text{Highest Ankle Pressure}}{\text{Highest Brachial Pressure}} \]

Right Ankle Pressure:

mmHg

Left Ankle Pressure:

mmHg

Right Brachial Pressure:

mmHg

Left Brachial Pressure:

mmHg

Highest ABI:

Right ABI:

Left ABI:

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1. What is the Ankle-Brachial Index (ABI)?

The Ankle-Brachial Index (ABI) is a simple, non-invasive test used to screen for peripheral artery disease (PAD). It compares the blood pressure in your ankle with the blood pressure in your arm to assess blood flow to your legs.

2. How Does the ABI Calculator Work?

The calculator uses the standard ABI formula:

\[ ABI = \frac{\text{Highest Ankle Pressure}}{\text{Highest Brachial Pressure}} \]

Where:

Highest Ankle Pressure — The higher of the right and left ankle systolic pressures (mmHg)
Highest Brachial Pressure — The higher of the right and left arm systolic pressures (mmHg)

Explanation: The ABI calculation identifies reduced blood flow to the legs by comparing arterial pressures between the upper and lower extremities.

3. Importance of ABI Measurement

Details: ABI is a valuable screening tool for peripheral artery disease. An ABI value less than 0.9 suggests PAD, while values greater than 1.3 may indicate arterial stiffness.

4. Using the Calculator

Tips: Enter systolic blood pressure measurements from both ankles and both arms in mmHg. All values must be valid positive numbers. The calculator will determine the highest ABI as well as individual right and left ABI values.

5. Frequently Asked Questions (FAQ)

Q1: What is a normal ABI value?
A: A normal ABI ranges from 0.9 to 1.3. Values below 0.9 suggest peripheral artery disease, while values above 1.3 may indicate non-compressible vessels.

Q2: How is ABI testing performed?
A: ABI testing is performed by measuring systolic blood pressure in both arms and both ankles using a Doppler device and blood pressure cuffs.

Q3: Who should get an ABI test?
A: ABI testing is recommended for individuals with symptoms of PAD, those with risk factors for cardiovascular disease, and smokers over age 50.

Q4: What do different ABI values indicate?
A: Values 0.91-1.30 are normal; 0.71-0.90 indicate mild PAD; 0.41-0.70 indicate moderate PAD; ≤0.40 indicate severe PAD.

Q5: Are there limitations to ABI testing?
A: ABI may be less accurate in people with diabetes, renal failure, or very calcified arteries which may cause falsely elevated values.