1,329 calculators and references across 60 specialties, with formula confidence shown up front.
Wall Shear Stress Gradient Index (WSSG): Explanation and Clinical Context Wall Shear Stress Gradient (WSSG) represents the spatial rate of change in wall shear stress (WSS) along the vessel surface and is a critical biomechanical determinant of endothelial behavior. It quantifies how rapidly the tangential force exerted by flowing blood varies over a given vascular segment. In normal arterial physiology, WSS remains
Wasserman Algorithm Index: Explanation and Clinical Context The Wasserman Algorithm Index is a clinical tool used to evaluate cardiopulmonary exercise capacity relative to predicted values based on age and sex. It incorporates measured VO2 peak during exercise testing, resting heart rate, and demographic variables to provide a percentage of predicted maximal oxygen uptake. A value >80% of predicted is generally consi
Weber Classification (CPET Functional Class): Explanation and Clinical Context The Weber classification categorizes patients with chronic heart failure based on peak oxygen consumption (peak VO₂) measured during cardiopulmonary exercise testing (CPET). Class A corresponds to peak VO₂ > 20 mL/kg/min, indicating near-normal exercise capacity and favorable prognosis. Class B (16–20 mL/kg/min) indicates mild limitation o
Wells DVT Score: Explanation and Clinical Context The Wells DVT Score is a validated clinical tool used to estimate the probability of deep vein thrombosis in patients presenting with suspected DVT. It uses nine clinical variables including active cancer, immobilization or paralysis, recent surgery or bedridden status, localized tenderness along the deep venous system, swelling of the leg, calf swelling >3 cm, pittin
Wells Pulmonary Embolism (PE) Score: Explanation and Clinical Context The Wells PE Score is a validated clinical tool used to estimate the pretest probability of pulmonary embolism in patients presenting with suspected PE. It uses simple clinical criteria including signs of DVT, heart rate, recent immobilization or surgery, previous history of DVT/PE, hemoptysis, and active malignancy. The total score stratifies pati
White Coat Hypertension Risk Index: Explanation and Clinical Context The White Coat Hypertension (WCH) Risk Index estimates the likelihood that a patient’s elevated office blood pressure readings are due to the white coat effect rather than sustained hypertension. It integrates office systolic and diastolic BP, age, sex, family history, and patient anxiety during measurement to calculate a probabilistic risk using a
The WHO/ISH Cardiovascular Risk Charts Calculator provides a comprehensive estimation of 10-year risk for major cardiovascular events such as myocardial infarction or stroke. Risk is categorized visually with colors: <10% (green, low risk), 10-19% (yellow, moderate risk), 20-29% (orange, high risk), and >30% (red, very high risk). The calculator uses age, gender, systolic blood pressure, smoking status, and diabetes
WHOQOL-BREF Cardiac-Adapted: Explanation and Clinical Context The WHOQOL-BREF is a validated instrument to assess health-related quality of life across four key domains: physical health, psychological health, social relationships, and environment. In cardiac-adapted versions, specific questions are tailored to cardiovascular patients, capturing limitations, symptoms, social support, and environmental factors that imp
WIfI Classification (Wound, Ischemia, Foot Infection): Explanation and Clinical Context WIfI Classification is a standardized tool to stratify the risk of major amputation in patients with critical limb ischemia or diabetic foot ulcers. It evaluates three components: wound extent, limb ischemia, and foot infection, each scored 0–3. The combination of these scores determines the WIfI Stage (1–4) and predicts the 1-yea
Wilkins Score (Mitral Balloon Valvuloplasty): Explanation and Clinical Context The Wilkins Score is an echocardiographic scoring system designed to assess the suitability of patients with mitral stenosis for percutaneous balloon mitral valvuloplasty (PBMV). It evaluates four parameters: leaflet mobility, leaflet thickening, leaflet calcification, and subvalvular thickening, each graded from 1 (mild/normal) to 4 (seve
Heads-up: You asked for the “CARDEL Index (CABG perioperative bleeding)”. The CARDEL Index predicts postoperative delirium after CABG, not bleeding. For perioperative bleeding after isolated CABG, the validated model is the WILL-BLEED Risk Score (Biancari et al., Thromb Haemost 2017). The tool below implements that score using the original logistic model coefficients for a more precise probability estimate, alongside
Worsening Renal Function (WRF) Index in Heart Failure: Explanation and Clinical Context The WRF Index predicts the risk of acute kidney injury or worsening renal function in patients hospitalized with acute decompensated heart failure. It uses clinical variables such as age, baseline serum creatinine, systolic blood pressure, and heart rate at admission. Higher predicted probabilities indicate a higher likelihood of
Wright equation for estimated glomerular filtration rate explanation and clinical context The Wright equation estimates glomerular filtration rate in milliliters per minute using patient age weight height sex serum creatinine and body surface area computed by the DuBois formula. The equation was derived to improve accuracy of estimation in older adults and in oncology patients and incorporates an age dependent consta