X-Linked Carrier Risk Revised by Unaffected Sons (Bayes)
An X-linked carrier probability revised by unaffected sons, and optionally a negative carrier test, by Bayes' theorem.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Prior carrier probability
- 1/2
- Unaffected sons
- 3
Result: Carrier probability 0.1111 (1 in 9) after 3 unaffected sons
The tool opens with these values already filled in. Replace them with your own.
What you enter
- Prior carrier probability
- Unaffected sons
- A negative carrier test's detection rate (optional)
How this is calculated
Citation
Stated arithmetic: Bayes' theorem, with a conditional probability of one half per unaffected son for a carrier and one for a non-carrier.
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.