Work out carrier risk instantly with clear inputs, formula shown and shareable results.
Combines carrier frequencies for both partners with the one in four recessive transmission risk, and shows the residual risk left by an imperfect carrier test.
Carrier risk
Risk of an affected child = carrier risk of partner 1 x carrier risk of partner 2 x 0.25; residual risk = carrier frequency x (1 - test detection rate)
Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.
No panel detects every variant, so a negative result reduces but never eliminates carrier probability.
Substantially. Carrier frequencies for cystic fibrosis, thalassaemia and Tay-Sachs vary widely between populations.