Risk Score Calculator
Calculate clinical risk scores for medical decision-making including stroke risk and DVT probability.
📚 About CHA2DS2-VASc Score
The CHA2DS2-VASc score estimates stroke risk in patients with non-valvular atrial fibrillation (AFib). It helps guide decisions about anticoagulation therapy.
Score components:
- Congestive heart failure (1 point)
- Hypertension (1 point)
- Age ≥75 (2 points)
- Diabetes (1 point)
- Stroke/TIA/TE history (2 points)
- Vascular disease (1 point)
- Age 65-74 (1 point)
- Sex category - female (1 point)
Maximum score: 9 points
📚 About Wells Criteria for DVT
The Wells score estimates the pretest probability of deep vein thrombosis (DVT). It helps determine the need for further diagnostic testing.
A score of 0 or less indicates low probability, 1-2 moderate probability, and 3 or more high probability of DVT.
📊 CHA2DS2-VASc Risk Stratification
| Score | Annual Stroke Risk | Recommendation |
|---|---|---|
| 0 (male) or 1 (female) | ~0-1.3% | No anticoagulation or aspirin |
| 1 (male) | ~1.3% | Consider anticoagulation |
| ≥2 | 2.2-15.2% | Anticoagulation recommended |
📊 Wells Score Interpretation
| Score | Probability | DVT Prevalence |
|---|---|---|
| ≤0 | Low | ~5% |
| 1-2 | Moderate | ~17% |
| ≥3 | High | ~53% |
❓ Frequently Asked Questions
Why is female sex a risk factor in CHA2DS2-VASc?
Studies show women with AFib have a higher stroke risk than men, particularly at older ages. However, female sex alone (score of 1) without other risk factors may not require anticoagulation.
Can I check both age categories in CHA2DS2-VASc?
No. Select either "Age 75+" (2 points) OR "Age 65-74" (1 point), not both. If patient is 75 or older, only check the 75+ option.
What is the "alternative diagnosis" in Wells criteria?
This refers to conditions that could explain the symptoms equally well, such as cellulitis, muscle strain, or superficial thrombophlebitis. If an alternative diagnosis is equally likely, subtract 2 points.