Calculate your risk of stroke using the CHA2DS2-VASc score.
No (≤ 64)
Yes (65-74)
Yes (≥ 75)
No
Yes
No
Yes
Male
Female
No
Yes
No
Yes
No
Yes
Your CHA2DS2-VASc Score:
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Understanding the CHA2DS2-VASc Score
The CHA2DS2-VASc score is a clinical prediction tool used to assess the risk of stroke in patients with non-valvular atrial fibrillation (AFib). Atrial fibrillation is a common heart rhythm disorder where the upper chambers of the heart beat irregularly, which can lead to blood clots forming in the heart. These clots can travel to the brain and cause a stroke.
The CHA2DS2-VASc score helps healthcare providers identify patients who would benefit most from anticoagulant therapy (blood thinners) to prevent stroke. A higher score indicates a greater risk of stroke.
How the Score is Calculated:
Each component of the CHA2DS2-VASc score is assigned points based on the presence of specific risk factors. The total score is the sum of the points from each applicable category:
eSc (Sex category): Female: 1 point, Male: 0 points
The calculator above simplifies this by using dropdowns where you select the presence of each factor. Note that the 'Age' factor has been broken down into ranges for accurate scoring:
Age ≤ 64: 0 points
Age 65-74: 1 point
Age ≥ 75: 2 points
Similarly, the 'Sex' factor is scored as 1 point for females and 0 points for males.
Interpreting the Score:
The total CHA2DS2-VASc score is used to guide treatment decisions:
Score of 0 (for males) or 1 (for females): Low stroke risk. Anticoagulation is generally not recommended.
Score of 1 (for males) or 2 (for females): Intermediate stroke risk. Anticoagulation may be considered.
Score of 2 or higher (for males) or 3 or higher (for females): High stroke risk. Anticoagulation is generally recommended.
It's crucial to remember that this calculator is for informational purposes only. Always consult with a qualified healthcare professional for diagnosis, treatment, and management of atrial fibrillation and stroke risk. They will consider your overall health, other medical conditions, and personal circumstances when making treatment recommendations.
function calculateCHA2DS2VASC() {
var ageValue = parseInt(document.getElementById("age").value);
var hypertensionValue = parseInt(document.getElementById("hypertension").value);
var diabetesValue = parseInt(document.getElementById("diabetes").value);
var sexValue = parseInt(document.getElementById("sex").value);
var cvdValue = parseInt(document.getElementById("cvd").value);
var vascDiseaseValue = parseInt(document.getElementById("vasc_disease").value);
var strokeValue = parseInt(document.getElementById("stroke").value);
var cha2ds2vascScore = ageValue + hypertensionValue + diabetesValue + sexValue + cvdValue + vascDiseaseValue + strokeValue;
var scoreElement = document.getElementById("scoreValue");
var riskElement = document.getElementById("riskLevel");
scoreElement.innerText = cha2ds2vascScore;
var riskLevelText = "";
var scoreIsMale = true; // Assume male by default
// Determine if the score is for a male or female based on the dropdown selection.
// If sex is '0' (Male), scoreIsMale remains true. If sex is '1' (Female), scoreIsMale becomes false.
if (sexValue === 1) { // Female selected
scoreIsMale = false;
}
if (scoreIsMale) {
// Male scoring
if (cha2ds2vascScore === 0) {
riskLevelText = "Low Stroke Risk. Anticoagulation generally not recommended.";
} else if (cha2ds2vascScore === 1) {
riskLevelText = "Intermediate Stroke Risk. Anticoagulation may be considered.";
} else { // Score >= 2
riskLevelText = "High Stroke Risk. Anticoagulation generally recommended.";
}
} else {
// Female scoring
if (cha2ds2vascScore === 1) { // Corresponds to Female (1 pt) + Male score of 0
riskLevelText = "Low Stroke Risk. Anticoagulation generally not recommended.";
} else if (cha2ds2vascScore === 2) { // Corresponds to Female (1 pt) + Male score of 1
riskLevelText = "Intermediate Stroke Risk. Anticoagulation may be considered.";
} else { // Score >= 3
riskLevelText = "High Stroke Risk. Anticoagulation generally recommended.";
}
}
riskElement.innerText = riskLevelText;
}