What are the odds?

This is the technical bit. The odds of having cystinuria are dependent on your parents. As cystinuria is a recessive gene it is one of those conditions that should eventually die out in your blood line.

The odds are as follows:

  • For children of parents who both have cystinuria the chances of the children becoming cystinurics are 100%. That’s the bad news.
  • For children of parents of whom one has cystinuria and the other is a carrier the chances of each child having cystinuric is 50% or 1 in 2. The chances are the same of becoming a carrier.
  • For children of parents who are both carriers the chances of each child having cystinuria is 25% or 1 in 4.
  • For children of parents of whom one has cystinuria and the other neither has cystinuria or is a carrier, the chances of each child becoming having cystinuria is nil. However the child will be a carrier. If that child has a baby with someone who is does not have cystinuria and is not a carrier then that child has a 50% chance of becoming a carrier.

This is all good news for people with cystinuria and not good news for cystinuria. The most conservative ratio of a person being a carrier is 1 in 150. So you have a 149 chances out of 150 of having a child with someone who isn’t a carrier.