Huntington Disease CAG Repeat Prognosis Calculator

Estimate age of onset and disease progression in Huntington disease based on CAG repeat length in the HTT gene. Longer repeats correlate with earlier onset.

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Clinical Guidance

BMI is a screening measure of body size, not a direct measure of body fat. The standard WHO categories are underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30).

BMI can overestimate body fat in athletes with high muscle mass and underestimate it in older adults with low muscle mass. Interpret it alongside waist circumference and clinical context rather than as a standalone diagnosis.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.
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How It Works

Estimate age of onset and disease progression in Huntington disease based on CAG repeat length in the HTT gene. Longer repeats correlate with earlier onset

Each component has a specific meaning:

  • CAG repeat length in the HTT gene — The cag repeat length in the htt gene recorded for the scenario being assessed.

Note: Interpret the hd cag prognosis result against the thresholds and context described above.

How to Use

Enter the CAG repeat length in the HTT gene for the scenario you are assessing. Estimate age of onset and disease progression in Huntington disease based on CAG repeat length in the HTT gene. Longer repeats correlate with earlier onset. Use the hd cag prognosis result to inform your calculation.

Frequently Asked Questions