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Doctor insights on: Can You Be A Carrier Of Cystic Fibrosis If You Have Two Healthy Parents

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Can you be a carrier of cystic fibrosis if you have two healthy parents?

Can you be a carrier of cystic fibrosis if you have two healthy parents?

Yes: Cystic fibrosis (CF) is a genetic disease, but it requires two faulty genes to be expressed as a disease. A healthy person can carry one defective CF gene and not be affected by cf. If each member of a couple has a defective CF gene, they have a 25% chance of having a child who inherits both defective copies of the CF gene. Depending on the type of CF gene defect, that child could then develop cf. ...Read more

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Dr. William Walsh
981 doctors shared insights

Cystic Fibrosis (Definition)

Cystic fibrosis is a genetic disorder of the lungs and digestive tract. It causes recurrent lung infections and inhibits growth in patients. Average life expectancy of patients with cystic fibrosis ...Read more


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If only one parent is a carrier of cystic fibrosis, how likely is the child to be a carrier?

If only one parent is a carrier of cystic fibrosis, how likely is the child to be a carrier?

50%: A carrier parent has 2 possible genes to pass along.There is a fifty % chance a child could get either the normal or CF gene. If they did, they would be a carrier, like the parent. ...Read more

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Do both parents have to be cystic fibrosis carriers for a child to get it?

Do both parents have to be cystic fibrosis carriers for a child to get it?

Yes: Cystic fibrosis is an autosomal recessive disease which means that a person needs to inherit 2 abnormal genes in order to have the disease. Those 2 abnormal copies come one each from the 2 parents, so both parents need to be at least carriers. ...Read more

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If both parents are "carriers" of a cystic fibrosis allele, what are the odds of passing it on?

50%/time: Carrier parents pass either the normal or affected gene at equal(50%) frequency any time they conceive.In a million random parings, 25% would result in cf, 25% in non-carrier & 50% carriers. In practice, the parents could produce all cf, all carrier or all non- carrier kids. ...Read more

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Do both parents have to be cystic fibrosis carriers in order for their child to be born with this disease?

Do both parents have to be cystic fibrosis carriers in order for their child to be born with this disease?

Yes: Both parents have to be carriers and then their child has 25% chance of having the disease, 50% chance of being a carrier and 25% of not even being a carrier. The most common mutation causing cystic fibrosis is ?f508. But there are over 1500 mutations identified so far. ...Read more

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What are the chances of passing on the Cystic Fibrosis gene if only one parent is a CARRIER? Other parent not a carrier.

What are the chances of passing on the Cystic Fibrosis gene if only one parent is a CARRIER? Other parent not a carrier.

50-50: One half of offspring will be carriers and one half will not be carriers. No offspring will be afflicted. Thanks for trusting HealthTap! ...Read more

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Do both parents have to be cystic fibrosis gene carriers for their child to get it?

Do both parents have to be cystic fibrosis gene carriers for their child to get it?

Yes: It is a recessive trait, so both have to have the gene to pass it to a child. ...Read more

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Symptoms of mild cystic fibrosis that a parent might not even notice?

Poor growth/GI: In some children, 1st sign of CF is poor growth with child being small for age. This may be subtle enough that child continues to follow a growth curve on the growth chart, but in the lower percentiles until growth flattens out. Others have loose greasy stools as 1st sign. Frequent "bronchitis"/"sinus infections" that are thought to be just that until someone asks if that's just too many. ...Read more

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Can anyone be parents with kids with cystic fibrosis?

Reinterpret question: If your question is can any parent have a child with cf, the answer is potentially yes. Both parents can have the mutation of cf, never know they carry it, & have a kid with the disorder.This is a common presentation. Adult males with CF have a 95% rate of sterility. CF females with good lung function can carry a pregnancy but the process may led to lung failure & death. ...Read more

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What are the chances of inheriting cystic fibrosis if one parent has trait?

What are the chances of inheriting cystic fibrosis if one parent has trait?

Depends: This depends on the profile of the other parent. Their are dozens of mutations that can lead to CF, although most are the delta 509. Both parents must carry a CF related gene for an offspring to get it, and if so the risk is 25%. Carrier testing is available through specialty labs.If only one has trait ,zero. ...Read more

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