83 Clinical Calculators Every Physician Should Know

Clinical calculators transform subjective clinical assessments into standardized, evidence-based scores. They reduce cognitive load, improve consistency, and help quantify risk in ways that inform treatment decisions.

From the CHA₂DS₂-VASc score guiding anticoagulation in atrial fibrillation to the APACHE II score predicting ICU mortality, these tools are foundational to modern evidence-based practice.

Cardiovascular medicine has the largest collection of validated scoring tools:

- CHA₂DS₂-VASc Score: Stroke risk stratification in atrial fibrillation. Guides anticoagulation decisions. - HAS-BLED Score: Bleeding risk assessment for patients on anticoagulation. - HEART Score: Risk stratification for acute chest pain in the emergency department. - TIMI Score (UA/NSTEMI): 14-day mortality risk in unstable angina and NSTEMI. - TIMI Score (STEMI): 30-day mortality risk in ST-elevation MI. - GRACE Score: 6-month mortality prediction in acute coronary syndromes. - ASCVD 10-Year Risk: Atherosclerotic cardiovascular disease risk estimation. - QTc Correction: Corrected QT interval using Bazett, Fridericia, or Framingham formulas. - Framingham Risk Score: 10-year coronary heart disease risk. - Mean Arterial Pressure (MAP): Hemodynamic assessment. - Revised Cardiac Risk Index (RCRI): Perioperative cardiac risk for non-cardiac surgery. - Sgarbossa Criteria: STEMI diagnosis in left bundle branch block.

- Wells Criteria for PE: Pre-test probability of pulmonary embolism. - PERC Rule: Safely excludes PE without further testing in low-risk patients. - PESI / Simplified PESI: Pulmonary embolism severity and prognosis. - CURB-65 Score: Community-acquired pneumonia severity assessment. - A-a Gradient: Alveolar-arterial oxygen difference for hypoxemia workup. - Light's Criteria: Differentiates transudative from exudative pleural effusions. - PSI/PORT Score: Pneumonia severity index for disposition decisions.

- Ottawa Ankle Rule: Determines need for ankle X-ray after injury. - Ottawa Knee Rule: Determines need for knee X-ray after injury. - Canadian C-Spine Rule: Safely clears cervical spine without imaging. - NEXUS Criteria: Alternative cervical spine clearance criteria. - SIRS Criteria: Identifies systemic inflammatory response. - Canadian Syncope Risk Score: Risk stratification for syncope in the ED. - Injury Severity Score (ISS): Trauma severity classification.

- APACHE II Score: ICU mortality prediction based on 12 physiologic variables. - Glasgow Coma Scale (GCS): Standardized assessment of consciousness. - NEWS2 Score: National Early Warning Score for deterioration detection. - qSOFA Score: Quick sepsis screening at the bedside. - SOFA Score: Sequential Organ Failure Assessment for sepsis severity. - Predicted Body Weight: ARDSNet lung-protective ventilation tidal volume calculation.

- PHQ-9: Depression severity screening and monitoring. - GAD-7: Generalized anxiety disorder severity. - AUDIT-C: Alcohol use disorder screening. - MDQ: Mood Disorder Questionnaire for bipolar screening. - C-SSRS: Columbia Suicide Severity Rating Scale. - MMSE: Mini-Mental State Examination for cognitive screening.

Renal (4): eGFR (CKD-EPI 2021), Cockcroft-Gault creatinine clearance, FENa, Free Water Deficit.

Hepatology (3): MELD-Na score for liver transplant prioritization, Child-Pugh score for cirrhosis severity, FIB-4 index for liver fibrosis.

Neurology (4): ABCD² score for TIA stroke risk, NIHSS for stroke severity, Hunt & Hess classification for subarachnoid hemorrhage, ICH Score for intracerebral hemorrhage prognosis.

Pediatrics (3): PECARN head CT decision rule, Apgar score, Pediatric GCS.

Obstetrics (3): Bishop score for cervical readiness, Gestational age calculator, VBAC success predictor.

Hematology (3): Wells Criteria for DVT, 4Ts score for heparin-induced thrombocytopenia, Absolute Neutrophil Count.

Plus additional calculators for GI (Ranson, Glasgow-Blatchford), oncology (MASCC, performance status), endocrinology (insulin dosing), rheumatology (DAS28), anesthesiology (Mallampati, STOP-BANG), urology (IPSS), surgery (Caprini VTE), infectious disease (Centor), and general use (BMI, BSA, ideal body weight, LDL, eAG, ASA class).

In AttendMe.ai, you do not need to search for or navigate to a calculator. When your clinical question involves a scenario where a validated calculator applies, the system detects this automatically and presents the calculator alongside your evidence-based answer.

For example, asking "What is the stroke risk for a 72-year-old with AF, hypertension, and diabetes?" automatically triggers the CHA₂DS₂-VASc calculator with the relevant parameters pre-filled.

All 83 calculators include PubMed provenance links to their original validation studies, so you can verify the evidence behind any score.