1,329 calculators and references across 60 specialties, with formula confidence shown up front.
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
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
Explanation and Clinical Context The Academic Research Consortium high bleeding risk construct was developed to provide a standardized binary definition of bleeding risk in patients undergoing percutaneous coronary intervention and receiving dual antiplatelet therapy. It organizes clinical characteristics into major and minor criteria that are based on expected one year incidence of serious bleeding events. Major cri
ATRIA Stroke Risk Score: Explanation and Clinical Context The ATRIA Stroke Risk Score is a validated clinical tool to predict the risk of ischemic stroke in patients with atrial fibrillation. It uses common patient characteristics including age, sex, history of diabetes mellitus, heart failure, hypertension, and prior stroke/TIA. Scores are calculated by assigning points to each risk factor, resulting in a total scor
Bova Score: Explanation and Clinical Context Bova Score is a validated clinical tool to stratify early risk in patients with acute pulmonary embolism (PE) and identify those at higher risk of adverse outcomes, including hemodynamic decompensation. The score uses four variables: heart rate >110 bpm (1 point), systolic blood pressure 90–100 mmHg (1 point), elevated cardiac troponin (1 point), and right ventricular dysf
Caprini Score: Explanation and Clinical Context The Caprini Risk Assessment Model (2010 update) provides a detailed and validated scoring system to estimate venous thromboembolism (VTE) risk in surgical patients. Each risk factor is assigned a weight of 1, 2, 3, or 5 points based on its relative contribution to VTE development. Total scores classify patients into risk categories: Very Low, Low, Moderate, High, Very H
DAPT bleeding reduction strategy selector based on high bleeding risk explanation and clinical context This tool is intended for patients with acute coronary syndrome who undergo percutaneous coronary intervention and require dual antiplatelet therapy. It uses the Academic Research Consortium definition of high bleeding risk and the antiplatelet recommendations in the twenty twenty five guideline to suggest practical
DASH Score: Explanation and Clinical Context The DASH Score is a clinical prediction rule designed to estimate the risk of venous thromboembolism (VTE) in patients presenting with suspected VTE. It incorporates four variables: D-dimer levels, age, sex, and hormonal therapy use. Each variable is assigned points based on thresholds derived from cohort studies. Higher total scores correlate with increased probability of
EPIPHANY Index (Pulmonary Embolism in Cancer): Explanation and Clinical Context The EPIPHANY Index is a prognostic tool developed for patients with active cancer who present with pulmonary embolism. It estimates the risk of 30-day serious complications, including mortality, hemodynamic instability, or need for intensive care interventions. The score integrates clinical parameters available at presentation: oxygen sat
ESC Pulmonary Embolism (PE) Risk Table 2020: Explanation and Clinical Context The ESC PE Risk Table 2020 is a validated tool used to stratify patients with acute pulmonary embolism according to 30-day mortality risk. The score is calculated using simple clinical parameters available at presentation: age >80 years, heart rate >110 bpm, systolic blood pressure <100 mmHg, oxygen saturation <90%, and a history of cancer
FAST Score: Explanation and Clinical Context The FAST Score (Focused Assessment of Right Heart Strain in Pulmonary Embolism) is a simple risk stratification tool to assess the probability of adverse outcomes in patients with acute pulmonary embolism (PE) exhibiting right ventricular (RV) strain. It assigns 1 point for each of the following: heart rate > 100 bpm, hypotension (systolic blood pressure < 100 mmHg), and e
GARFIELD-AF Mortality Risk Model: Explanation and Clinical Context The GARFIELD-AF Mortality Risk Model is a validated predictive tool derived from the Global Anticoagulant Registry in the FIELD-Atrial Fibrillation (GARFIELD-AF) registry. It estimates the 1-year all-cause mortality risk in patients with newly diagnosed atrial fibrillation based on age, sex, comorbidities (heart failure, vascular disease, diabetes, pr
HERDOO2 Score: Explanation and Clinical Context The HERDOO2 score is a clinical decision tool designed to identify women with unprovoked venous thromboembolism (VTE) who may safely discontinue anticoagulation after 5–12 months of therapy. It includes four variables: Hyperpigmentation, Edema, or Redness in either leg; D-dimer >250 μg/L; Obesity (BMI >30 kg/m²); and Older age >65 years. Each variable scores 1 point if
Hestia Criteria (Outpatient Pulmonary Embolism Treatment Eligibility): Explanation and Clinical Context The Hestia criteria provide a validated, simple tool to identify patients with acute pulmonary embolism who may be safely treated as outpatients. The criteria include hemodynamic stability, absence of active or high-risk bleeding, no need for supplemental oxygen to maintain saturation above 90%, no severe comorbidi
High Bleeding Risk Diagnosis Score Tool Explanation and Clinical Context This calculator summarizes major bleeding related factors highlighted in the twenty twenty five American Heart Association acute coronary syndrome guideline to assist clinicians in identifying patients who have elevated bleeding potential during antithrombotic therapy. The variables reflect clinical domains frequently associated with hemorrhagic
IMPROVE VTE Risk Score: Explanation and Clinical Context The IMPROVE VTE Score is a validated clinical tool designed to predict the risk of venous thromboembolism (VTE) in hospitalized medical patients. It is based on simple clinical variables including previous VTE, known thrombophilia, current cancer, lower limb paralysis, immobilization >7 days, ICU or CCU stay, and age >60 years. Points are assigned according to
Khorana Score: Explanation and Clinical Context The Khorana Score is a validated risk assessment model for predicting cancer-associated thrombosis (CAT) in ambulatory patients with cancer. It assigns points based on five clinical variables: site of cancer, platelet count > 350 ×10^9/L, hemoglobin < 10 g/dL or use of erythropoiesis-stimulating agents, leukocyte count > 11 ×10^9/L, and BMI > 35 kg/m². Scores classify p
Outpatient Bleeding Risk Index (OBRI): Explanation and Clinical Context OBRI is a validated scoring system developed to predict the risk of major bleeding in outpatients receiving oral anticoagulant therapy, particularly warfarin. It assigns 1 point each for four clinical risk factors: age >65 years, history of stroke, history of gastrointestinal bleeding, and comorbid conditions including diabetes mellitus, cardiova
: Explanation and Clinical Context The Padua Prediction Score is a validated clinical tool used to estimate the risk of venous thromboembolism (VTE) in hospitalized medical patients. Each risk factor is assigned a specific point value based on its contribution to VTE risk. High-risk patients (score >4) are candidates for thromboprophylaxis, whereas low-risk patients (score <4) usually do not require routine prophylax
PERC Rule (Pulmonary Embolism Rule-out Criteria): Explanation and Clinical Context The PERC Rule is a clinical decision tool used to identify patients with a very low probability of pulmonary embolism (PE), in whom further diagnostic testing can be safely avoided. It includes 8 criteria: age > 50 years, heart rate > 100 bpm, oxygen saturation < 95%, prior history of PE or DVT, recent surgery or trauma, hemoptysis, es
PRECISE DAPT Score Clinical Explanation and Context The PRECISE DAPT Score is a validated clinical tool designed to estimate bleeding risk in patients undergoing dual antiplatelet therapy following percutaneous coronary intervention. The score includes age, hemoglobin, white blood cell count, creatinine clearance, and history of prior bleeding, which together reflect hematologic status, renal function, and vulnerabil
PROTECHT Score: Explanation and Clinical Context The PROTECHT Score is a validated risk assessment model for predicting chemotherapy-associated venous thromboembolism (VTE) in patients with active cancer. It incorporates three key variables: primary tumor site (high-risk: pancreatic or gastric), history of previous VTE, and use of platinum-based or gemcitabine chemotherapy. Points are assigned to each variable (tumor
Pulmonary Embolism Severity Index (PESI): Explanation and Clinical Context PESI is a validated risk stratification tool designed to estimate 30-day mortality in patients with acute pulmonary embolism. It incorporates 11 variables, including age, sex, comorbidities (cancer, heart failure, chronic lung disease), vital signs (heart rate, blood pressure, respiratory rate, temperature), altered mental status, and oxygen s
Revised Geneva Score (RGS): Explanation and Clinical Context The Revised Geneva Score is a validated clinical prediction rule used to estimate the pre-test probability of pulmonary embolism (PE) in patients presenting with suspected PE. It uses objective clinical variables including age >65 years, previous DVT or PE, recent surgery or fracture, active cancer, unilateral lower limb pain, hemoptysis, heart rate, pain o
RIETE Score (for VTE Recurrence): Explanation and Clinical Context The RIETE Score is a clinical tool designed to estimate the risk of recurrent venous thromboembolism (VTE) after an initial episode of deep vein thrombosis or pulmonary embolism. It incorporates patient factors such as age, sex, prior history of VTE, presence of active cancer, whether the initial VTE was unprovoked, and recent surgery or immobilizatio
sPESI (Simplified Pulmonary Embolism Severity Index): Explanation and Clinical Context The sPESI is a validated scoring tool designed to stratify the 30-day mortality risk of patients diagnosed with acute pulmonary embolism (PE). It simplifies the original PESI by including six clinical variables: age >80 years, history of cancer, history of chronic cardiopulmonary disease, heart rate >110 bpm, systolic blood pressur
Vienna Prediction Model for Recurrent Venous Thromboembolism: Explanation and Clinical Context The Vienna Prediction Model is a validated clinical tool designed to predict the 1-year risk of recurrent venous thromboembolism (VTE), particularly deep vein thrombosis (DVT), in patients who have completed initial anticoagulation. The model incorporates three key variables: gender (male vs female), DVT location (proximal
Villalta Score for Post Thrombotic Syndrome: Comprehensive Explanation and Clinical Context The Villalta score is a validated clinical tool used to diagnose and grade the severity of Post Thrombotic Syndrome in patients with a history of deep vein thrombosis. It consists of five patient reported symptoms including pain, cramps, heaviness, paresthesia, and pruritus, and six clinician assessed signs including pretibial
VTE-BLEED Score: Explanation and Clinical Context The VTE-BLEED score is a validated clinical tool developed to predict the risk of major bleeding in patients receiving anticoagulant therapy for venous thromboembolism (VTE). It incorporates seven readily available clinical parameters: active cancer, male sex with uncontrolled hypertension, anemia, history of bleeding, age > 60 years, renal dysfunction, and liver dysf
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
YEARS Algorithm: Explanation and Clinical Context The YEARS algorithm is a clinical decision rule designed to safely exclude pulmonary embolism (PE) without the need for immediate imaging in selected patients. It incorporates three key clinical criteria: clinical signs of deep vein thrombosis (DVT), hemoptysis, and whether PE is considered the most likely diagnosis. The algorithm uses an age-independent D-dimer thres