Vascular Assessment
Every vascular assessment calculator on CalcEngines — unit converters, derived indices and interpretive tools, each with its formula, a worked example and the reference intervals it is judged against.
8 calculators in this section
- Abdominal Aortic Aneurysm Surveillance Interval InterpreterThe published surveillance interval by maximum aortic diameter, with the bodies that publish different ones side by side — and the millimetres of measurement error that decide which band a diameter falls in.
- Aneurysm Growth Rate CalculatorMillimetres per year from two diameters and an interval — with the measurement error printed next to it, because inter-observer spread over a short interval produces a growth rate that is pure noise.
- Ankle-Brachial Pressure Index (ABPI) CalculatorOne leg at a time, with the convention stated: the higher of the two arms underneath, either ankle convention on top, and the trap that a normal or high index in a calcified limb is the dangerous answer.
- Carotid Stenosis NASCET to ECST ConverterThe same lesion, two percentages. NASCET divides by the distal internal carotid and ECST by the estimated original diameter at the stenosis, so ECST always reads higher and the two trials' thresholds are not comparable numbers.
- CEAP Venous Classification InterpreterThe clinical class of chronic venous disease in the 2020 revision — with the C4 subclasses, the recurrence modifier the revision added, and the reason CEAP does not add up to anything.
- Fontaine Stage InterpreterThe four clinical stages of lower limb arterial disease, with the 200-metre sub-division that separates IIa from IIb and the published correspondence to the Rutherford categories — which is not a one-to-one map.
- Rutherford Category InterpreterSeven categories of chronic limb ischaemia with the objective pressure criteria the 1997 reporting standard attaches to each — and the separate acute classification whose categories are also numbered IIa and IIb.
- Toe-Brachial Index (TBI) CalculatorThe index for a limb whose ankle pressure cannot be trusted: hallux systolic pressure over the higher brachial pressure, with the 0.70 threshold and the absolute toe pressures the published criteria use.