1,329 calculators and references across 60 specialties, with formula confidence shown up front.
18F-FDG Metabolic Score for Infective Endocarditis (IE): Explanation and Clinical Context The 18F-FDG metabolic score is a semiquantitative PET/CT-based tool used to support the diagnosis of infective endocarditis, particularly in prosthetic or complex valve situations. The score combines valvular uptake intensity, perivalvular uptake, prosthetic valve presence, and timing after surgery to estimate the probability of
2012 EULAR ACR Polymyalgia Rheumatica Classification Criteria Explanation and Clinical Context The 2012 EULAR ACR classification criteria for polymyalgia rheumatica are designed to help classify patients presenting with new onset bilateral shoulder pain and elevated inflammatory markers. This scoring system applies to patients aged 50 years or older and integrates clinical features such as prolonged morning stiffness
2018 Leibovich Model for Renal Cell Carcinoma: Comprehensive Explanation and Clinical Context The 2018 Leibovich Model is a postoperative prognostic scoring system designed for patients with clear cell renal cell carcinoma after nephrectomy. It estimates the risk of disease recurrence and long term oncologic outcomes using routinely available histopathologic variables. Definition and Components The model integrates p
2023 Duke ISCVID Diagnostic Criteria for Infective Endocarditis This calculator helps clinicians classify the probability of infective endocarditis based on the updated 2023 Duke ISCVID diagnostic criteria. 2023 Duke ISCVID Diagnostic Criteria for Infective Endocarditis Explanation and Clinical Context The 2023 Duke ISCVID criteria represent an updated and refined diagnostic framework for infective endocarditis incor
This tool assists clinicians in estimating the appropriate Emergency Department Evaluation and Management coding level based on 2023 CMS guidelines using clinical decision making criteria. 2023 Emergency Medicine Coding Guide Explanation and Clinical Context The Emergency Department Evaluation and Management coding system in 2023 is primarily determined by the level of Medical Decision Making rather than history or p
25(OH)D Level–CV Mortality Index: Explanation and Clinical Context The 25(OH)D Level–CV Mortality Index estimates the 10-year risk of cardiovascular mortality based on circulating 25-hydroxyvitamin D concentrations. Lower serum 25(OH)D levels have been associated with higher cardiovascular mortality, with risk stratification as follows: <10 ng/mL = very high risk, 10–19 ng/mL = high risk, 20–29 ng/mL = moderate risk,
This tool estimates the risk of electrographic seizures in critically ill patients undergoing continuous EEG monitoring. 2HELPS2B Seizure Risk Score Explanation and Clinical Context The 2HELPS2B score is a validated EEG based risk stratification tool designed to estimate the probability of electrographic seizures in hospitalized and critically ill patients undergoing continuous EEG monitoring. The score incorporates
30‑Day Readmission Risk Score after TAVR: Explanation and Clinical Context The 30‑Day Readmission Risk Score after transcatheter aortic valve replacement (TAVR) is a validated tool designed to estimate the probability of an unplanned all‑cause hospital readmission within 30 days of discharge. The original score was derived from data of over 10 000 patients in the STS/ACC TVT Registry (2015‑2017) and externally valida
4AT Delirium Screening Tool: Explanation and Clinical Context The 4AT Delirium Screening Tool is a rapid bedside assessment designed to identify delirium and cognitive impairment in hospitalized patients, particularly older adults and those with acute illness. It consists of four domains including alertness, brief cognitive testing using AMT4, assessment of attention, and evaluation of acute onset or fluctuating cour
4C Mortality Score for COVID 19 This calculator estimates in hospital mortality risk in patients admitted with COVID 19 using readily available clinical parameters at presentation. 4C Mortality Score for COVID 19 Explanation and Clinical Context The 4C Mortality Score is a validated prognostic tool developed to estimate in hospital mortality risk among patients admitted with COVID 19. It integrates eight routinely av
4D Flow MRI Helicity Index (HI): Explanation and Clinical Context Helicity quantifies the local alignment between velocity and vorticity in a flow field. In cardiovascular 4D Flow MRI, the helicity density is the dot product of the velocity vector and vorticity (the curl of velocity), and its normalized form—Local Normalized Helicity (LNH)—is defined as LNH = (v · ω) / (|v||ω|), ranging from −1 (left-handed) to +1 (r
The 4PEPS Pulmonary Embolism Clinical Probability Score is a validated clinical tool designed to estimate the pretest probability of acute pulmonary embolism using readily available clinical variables. 4PEPS Pulmonary Embolism Clinical Probability Score Explanation and Clinical Context The 4PEPS score is a simplified clinical prediction rule developed to estimate the pretest probability of acute pulmonary embolism us
Thrombocytopenia Select Platelet fall greater than fifty percent and nadir at least twenty thousand Platelet fall thirty to fifty percent or nadir ten to nineteen thousand Platelet fall less than thirty percent or nadir below ten thousand Timing of Platelet Count Fall Select Clear onset between day five and ten or within one day with prior heparin exposure Consistent with day five to ten but not clear or onset after
6 Minute Walk Test (6MWT): Explanation and Clinical Context The 6 Minute Walk Test (6MWT) is a standardized submaximal exercise test used to assess functional capacity, aerobic endurance, and response to therapy across a wide range of cardiopulmonary and systemic diseases. It measures the maximum distance an individual can walk on a flat surface over six minutes, reflecting integrated performance of the cardiovascula
6-Minute Walk Distance (6MWD) Adjustment for Age/Sex in Pulmonary Hypertension Risk: Explanation and Clinical Context The six-minute walk test (6MWT) measures the distance a patient can walk on a flat surface in six minutes (6MWD). In patients with pulmonary hypertension (PH) the 6MWD is a strong prognostic marker: shorter distances are associated with worse outcomes and higher mortality. However, because 6MWD is inf
6-Minute Walk Distance (6MWD): Explanation and Clinical Context The 6-Minute Walk Distance (6MWD) is a simple and validated test used to assess functional capacity and prognostic status in patients with cardiovascular and pulmonary diseases. It measures the distance a patient can walk on a flat surface within six minutes, integrating cardiac output, pulmonary function, peripheral muscle oxygen utilization, and motiva
6-Minute Walk Distance (6MWD) Percent Predicted: Explanation and Clinical Context The 6MWD is a standardized test measuring the distance a patient can walk in six minutes, reflecting functional exercise capacity. Percent predicted 6MWD is calculated using demographic factors (age, sex, height, weight) to estimate expected performance based on population norms. The formula used here is derived from Enright et al., 199
6-Minute Walk Distance (6MWD) Risk Category: Explanation and Clinical Context The 6-Minute Walk Distance (6MWD) is a standardized submaximal exercise test used to evaluate functional capacity in patients with pulmonary arterial hypertension (PAH). It measures the distance a patient can walk on a flat, hard surface in six minutes. Within the ESC/ERS 2022 risk assessment framework, 6MWD is a key parameter for estimatin
6MWD Risk Stratification in Pulmonary Hypertension: Explanation and Clinical Context The 6-minute walk distance (6MWD) is a simple, non-invasive functional test widely used in the assessment of patients with pulmonary arterial hypertension (PAH). It reflects exercise capacity, correlates with hemodynamic severity, and predicts prognosis. Low risk is defined as >440 meters, indicating preserved functional capacity and
A2C (Apical 2 Chamber) A2C (Apical 2 Chamber) A2C : Apical 2 chamber, LA : Left atrium, LV : Left ventricle, MV : Mitral valve. A2C (Zoomed Left Ventricle) A2C : Apical 2 chamber, LV : Left ventricle.
A3C (Apical 3 Chamber) A3C / APLAX (Apical 3 Chamber, Apical Long Axis) A3C : Apical 3 chamber, Ao : Aorta, AV : Aortic valve, LA : Left atrium, LV : Left ventricle, LVOT : Left ventricular outflow tract, MV : Mitral valve. A3C (Zoomed Left Ventricle) A3C : Apical 3 chamber, LV : Left ventricle.
A4C (Apical 4 Chamber) A4C (Apical 4 Chamber) A4C : Apical 4 chamber, IAS : Interatrial septum, IVS : Interventricular septum, LA : Left atrium, LV : Left ventricle, MV : Mitral valve, RA : Right atrium, RV : Right ventricle, TV : Tricuspid valve. A4C (Posterior Angulation) A4C : Apical 4 chamber, CS : Coronary sinus, LA : Left atrium, LV : Left ventricle, RA : Right atrium, RV : Right ventricle. A4C (Zoomed Left Ven
A5C (Apical 5 Chamber) A5C (Apical 5 Chamber) A5C : Apical 5 chamber, Ao : Aorta, IVS : Interventricular septum, LA : Left atrium, LV : Left ventricle, LVOT : Left ventricular outflow tract, RV : Right ventricle. A5C (Focus on RVOT) A5C : Apical 5 chamber, PA : Pulmonary artery, PV : Pulmonic valve, RVOT : Right ventricular outflow tract.
Abdominal Aortic Aneurysm (AAA) Rupture Risk Index: Explanation and Clinical Context AAA Rupture Risk Index is a tool designed to estimate the probability of rupture in patients with abdominal aortic aneurysm. It combines key risk factors including maximum aneurysm diameter, annual growth rate, and aneurysm morphology (fusiform or saccular). Diameter remains the strongest predictor, with risk increasing significantly
ABC Stroke Risk Score: Explanation and Clinical Context The ABC (Age, Biomarkers, Clinical History) Stroke Risk Score is a validated biomarker-based model designed to estimate the individual 1-year risk of ischemic stroke or systemic embolism in patients with atrial fibrillation. It was developed and validated using data from the ARISTOTLE and RE-LY trials (Hijazi et al., Circulation 2016;133:268–277). Unlike traditi
ABC Stroke Score (with biomarkers): Explanation and Clinical Context The ABC Stroke Score is a validated risk prediction tool for estimating 1-year risk of stroke in patients with atrial fibrillation. It integrates Age, Biomarkers (NT-proBNP), and Clinical history including prior stroke or TIA and renal function (creatinine). Age is a continuous predictor, with higher age associated with increased stroke risk. Prior
ABCD² Score (TIA Risk): Explanation and Clinical Context The ABCD² Score is a validated clinical tool designed to estimate the short-term risk of stroke following a Transient Ischemic Attack (TIA). It was developed by Rothwell et al. and published in Lancet (2005), combining simple clinical features—Age, Blood Pressure, Clinical presentation, Duration, and Diabetes—to predict stroke risk within 2, 7, and 90 days afte
Abdominal Trauma Injury Score Explanation and Clinical Context Abdominal Trauma Injury Score is a structured framework designed to quantify the severity of abdominal organ damage following traumatic injury. Each abdominal organ receives a numerical grade based on anatomical disruption, bleeding severity, and physiological effect. This approach aligns with widely accepted organ injury scales from major trauma associat
ABLATION-Success Score: Explanation and Clinical Context ABLATION-Success Score is a predictive tool developed to estimate the likelihood of maintaining sinus rhythm after catheter ablation in patients with atrial fibrillation. It incorporates key clinical variables including type of atrial fibrillation (paroxysmal, persistent, or long-standing persistent), left atrial diameter, patient age, comorbidities (hypertensi
Absolute and Relative Risk Reduction Explanation and Clinical Context Absolute Risk Reduction ARR represents the difference in event rates between a control group and an experimental group. ARR quantifies how much an intervention reduces risk in absolute terms and is directly interpretable in clinical practice. Relative Risk Reduction RRR represents the proportional decrease in risk relative to the baseline risk of t
ACEF Score: Explanation and Clinical Context The ACEF Score (Age, Creatinine, and Ejection Fraction) is a simple, validated risk prediction tool for short-term mortality in patients undergoing cardiac surgery or coronary interventions. It is calculated using the formula: ACEF = Age / LVEF + 1 (if serum creatinine > 2 mg/dL). Higher scores indicate higher risk of adverse outcomes. It is particularly useful in preopera
ACS And Gastrointestinal Bleeding PPI Indication Tool. Explanation And Clinical Context This tool is designed for patients with acute coronary syndrome who receive dual antiplatelet therapy oral anticoagulant therapy or both. The twenty twenty five ACC AHA ACS guideline states that in patients at high risk of gastrointestinal bleeding a proton pump inhibitor should be used together with dual antiplatelet therapy oral
Explanation and Clinical Context This tool is designed to support early identification of patients with suspected acute coronary syndromes who are likely to have acute myocardial infarction by combining high sensitivity cardiac troponin results with electrocardiographic findings and assay specific thresholds. The 2025 American Heart Association acute coronary syndromes guideline emphasizes that initial assessment sho
ACS Early Rule In Pathway Tool Explanation and Clinical Context This tool is designed to support early identification of patients with suspected acute coronary syndromes who are likely to have acute myocardial infarction by combining high sensitivity cardiac troponin results with electrocardiographic findings and assay specific thresholds. The 2025 American Heart Association acute coronary syndromes guideline emphasi
Explanation and Clinical Context This tool helps clinicians identify bedside clinical features that signal high risk acute coronary syndromes. It is designed for patients with suspected or confirmed acute coronary syndromes including non ST segment elevation presentations and ST segment elevation presentations. The focus is early recognition of unstable clinical states that may benefit from rapid invasive evaluation
Explanation and Clinical Context This tool provides a structured bedside approach to identify patients with acute coronary syndrome who may be suitable for early hospital discharge once initial management is complete. It is intended for use after the acute phase when the treating team is considering discharge and when electrocardiography biomarkers and imaging data are already available. The tool combines simple clin
Explanation and Clinical Context This calculator implements the TIMI risk score for ST elevation myocardial infarction to estimate thirty day mortality risk in patients with acute coronary syndrome who present with ST elevation. It uses simple clinical variables that are available at the bedside including age systolic blood pressure heart rate Killip class history of diabetes hypertension or angina anterior ST elevat
Explanation and Clinical Context This decision aid is designed to support bedside selection of an antithrombotic regimen for patients with acute coronary syndrome by integrating presentation type initial management strategy coronary stent status need for chronic oral anticoagulation history of ischemic stroke or transient ischemic attack and estimated bleeding risk into a structured medication suggestion. In the Amer
Explanation and Clinical Context This tool provides individualized pharmacotherapy recommendations for acute coronary syndrome based on AHA guideline twenty twenty five. Core therapy for all ACS patients includes rapid initiation of Aspirin P2Y12 inhibitor parenteral anticoagulation and high intensity statin therapy unless contraindicated. Dual antiplatelet therapy with Aspirin plus Ticagrelor or Prasugrel is preferr
Explanation and Clinical Context This calculator helps determine the optimal revascularization approach in acute coronary syndrome based on clinical urgency hemodynamic status ischemic burden and risk features recommended in the 2025 American Heart Association guideline. Revascularization strategies include Immediate reperfusion for ST elevation myocardial infarction or unstable electrical and hemodynamic profiles Ea
Explanation And Clinical Context This tool summarizes short term mortality and ischemic risk estimation for patients with acute coronary syndromes based on guideline supported risk scores. The 2025 American Heart Association acute coronary syndromes guideline highlights that risk for early death and major adverse cardiac events varies widely among patients and that structured risk assessment can support bedside decis
ACS Troponin Interpretation Aid Sex Specific Thresholds Explanation and Clinical Context This tool supports interpretation of high sensitivity cardiac troponin concentrations in patients with suspected acute coronary syndrome by relating the measured value to the appropriate sex specific ninety ninth percentile upper reference limit reported for the local assay. Current guidelines recommend high sensitivity troponin
ACS-NSQIP MICA (Myocardial Infarction or Cardiac Arrest) Risk: Explanation and Clinical Context The ACS-NSQIP MICA model estimates the probability of perioperative myocardial infarction or cardiac arrest within 30 days of surgery using five independent predictors: age, functional status, ASA class, serum creatinine, and procedure category. The logistic equation is x = 0.02×Age + Functional + ASA + Creatinine + Proced
The audited source currently returns an empty page. This catalog entry is retained for coverage and monitoring, but no clinical content or calculation is asserted.
ACUITY HORIZONS Score Explanation and Clinical Context The ACUITY HORIZONS risk score is a validated clinical tool that helps estimate the risk of major adverse cardiovascular events in patients presenting with acute coronary syndromes who undergo an early invasive strategy. This score incorporates age, renal function expressed through serum creatinine, hemodynamic status reflected by systolic blood pressure, and the
ADA 10-Year Cardiovascular Risk Model: Explanation and Clinical Context This model estimates the 10-year risk of atherosclerotic cardiovascular disease (ASCVD) based on factors such as age, gender, race, cholesterol levels, blood pressure, diabetes status, and smoking history. It is derived from the Pooled Cohort Equations, which are widely used for cardiovascular risk assessment.
Additive EuroSCORE: Explanation and Clinical Context The Additive European System for Cardiac Operative Risk Evaluation (EuroSCORE) is a widely used risk stratification tool to estimate operative mortality for patients undergoing cardiac surgery. Each risk factor is assigned a score (1–3 points) based on its impact on operative mortality. The total score is then used to approximate the risk of in-hospital death. This
ADHERE Renal Subscore: Explanation and Clinical Context The ADHERE Renal Subscore is part of the ADHERE risk model, developed to estimate in-hospital mortality risk for patients admitted with acute decompensated heart failure (ADHF). It incorporates renal function parameters, specifically serum creatinine and blood urea nitrogen (BUN) levels, to assess the severity of renal impairment. Higher levels of creatinine and
ADHERE Tree Model: Explanation and Clinical Context The ADHERE Tree Model is a validated bedside tool to estimate in-hospital mortality risk for patients admitted with acute decompensated heart failure (ADHF). It uses three key clinical variables readily available at hospital admission: Blood Urea Nitrogen (BUN), Systolic Blood Pressure (SBP), and Serum Creatinine. Based on these values, patients are stratified into
ADHERE Classification and Regression Tree (CART) — explanation and clinical context The ADHERE CART is a simple bedside decision tree developed from the Acute Decompensated Heart Failure National Registry to estimate the risk of in-hospital mortality for patients hospitalized with acute decompensated heart failure. The CART analysis identified three sequential admission variables that provided the best discrimination
The audited source currently returns an empty page. This catalog entry is retained for coverage and monitoring, but no clinical content or calculation is asserted.
Adult Treatment Panel (ATP) Cardiometabolic Index: Explanation and Clinical Context The ATP Cardiometabolic Index (CMI) is a composite parameter derived from the ratio of triglycerides to HDL cholesterol, multiplied by waist circumference. It reflects the integrated risk of insulin resistance, visceral adiposity, and dyslipidemia—three core components of the metabolic syndrome defined by the National Cholesterol Educ
Advanced CVD Risk Model: Explanation and Clinical Context The Advanced CVD Risk Model, developed by the American Heart Association, estimates the 10-year risk of cardiovascular events in individuals aged 30–79 years without a history of cardiovascular disease. This model incorporates factors such as age, sex, race, smoking status, diabetes, systolic blood pressure, total cholesterol, and HDL cholesterol levels to pro
AEPEI Score: Explanation and Clinical Context The AEPEI Score is a clinical tool designed to assess the risk of adverse outcomes in patients with prosthetic valve endocarditis. It incorporates three key variables: age, prosthetic valve type, and the presence of extra-cardiac events. A higher score indicates an increased risk of mortality and complications, aiding clinicians in making informed decisions regarding pati
AEPEI Surgical Risk Index: Explanation and Clinical Context The AEPEI Surgical Risk Index is a validated tool designed to estimate perioperative mortality risk in patients undergoing major non-cardiac surgery. It incorporates key patient-specific factors including age, ASA classification, urgency of surgery, heart failure, renal insufficiency, and the complexity of the surgical procedure. The score is calculated by a
Aerobic Capacity Prediction by METs: Explanation and Clinical Context Aerobic capacity, measured in metabolic equivalents or METs, reflects the maximum oxygen consumption during physical activity and serves as a direct marker of cardiorespiratory fitness. This calculator predicts expected aerobic capacity based on age and sex using validated population formulas. Aerobic capacity consistently demonstrates a strong ass
Atrial Fibrillation (AF) Burden: Explanation and Clinical Context Atrial Fibrillation (AF) burden refers to the cumulative duration of AF episodes experienced by a patient per day, typically measured via continuous ECG monitoring or implantable devices. It is quantified in minutes/day and provides valuable prognostic information beyond AF presence alone. Studies show that higher AF burden is associated with increased
AF Polygenic Risk Score (AF-PRS): Explanation and Clinical Context The AF Polygenic Risk Score (AF-PRS) quantifies an individual's inherited genetic susceptibility to atrial fibrillation based on the cumulative effect of multiple risk alleles. It is derived from genome-wide association studies (GWAS) that identify common single nucleotide polymorphisms (SNPs) associated with AF risk. The PRS is calculated by summing
AFEQT Score (Atrial Fibrillation Effect on Quality of Life): Explanation and Clinical Context The AFEQT Score is a validated patient-reported outcome measure that assesses health-related quality of life in patients with atrial fibrillation (AF). It evaluates four domains: Symptoms, Daily Activities, Treatment Concern, and Overall Health. Each domain is scored from 0 to 100, where higher scores indicate better quality
AFIRE Study Algorithm — Practical explanation and context This calculator applies the core enrollment and outcome insights from the AFIRE randomized trial (Atrial Fibrillation and Ischemic Events with Rivaroxaban in Patients with Stable Coronary Artery Disease) to provide a pragmatic recommendation: patients with atrial fibrillation and stable CAD who are at least 1 year past revascularization (or have angiographical