Cystic Fibrosis Carrier Screening
Cystic fibrosis is one of the most common inherited conditions in the United States, and more than 10 million Americans carry a mutation in the CFTR gene without knowing it.¹ Cystic fibrosis screening determines whether you carry a mutation that could affect your children, so you and your partner can understand your risk before or during pregnancy, giving you the greatest range of prevention and treatment options.
What Is Cystic Fibrosis?
Cystic fibrosis is a respiratory and digestive condition associated with genetic mutations in the CFTR gene. When both copies of the gene carry a gene change that renders them non-working, mucus throughout the body becomes thick and sticky instead of thin and slippery. This mainly affects the lungs and digestive system, leading to repeated lung infections, lung scarring and digestive difficulties.
To have cystic fibrosis, a child needs to have inherited a non-working copy of CFTR from each parent.¹ A carrier has one working copy and one non-working copy. Carriers are expected to be healthy and don't have cystic fibrosis themselves.¹
Why Cystic Fibrosis Testing Matters Now More Than Ever
Cystic fibrosis treatment has changed dramatically in the last several years. A newer class of medications called CFTR modulators directly target the underlying gene defect rather than just managing symptoms, and the results have been dramatic: median survival age for certain people with cystic fibrosis rose from 29 years in 1990 to 68 years in 2023, largely due to these therapies.²
CFTR modulators work differently depending on which specific gene change a person has, so knowing the exact genetic mutations contributing to disease helps connect a child to the right treatment as early as possible. There's also a practical reason to know early; these medications are expensive, with a list price that has run as high as $311,741 a year for a single patient.³ Families who understand their carrier status ahead of time have more time to research insurance coverage and patient assistance programs.
Couples who understand their risk of having children with cystic fibrosis in advance of pregnancy can also utilize reproductive technologies to virtually eliminate their risk of passing the condition on to their children.
Doesn't Newborn Screening Already Catch This?
Every state screens newborns for cystic fibrosis, but that screening isn't as airtight as you might think. Newborn screening works by measuring a substance called IRT in a blood sample, and it can miss the condition entirely (a false negative) or flag a baby who turns out not to have cystic fibrosis at all (a false positive), which is why any positive screen still requires a follow-up sweat test to confirm a diagnosis.⁴ Cystic fibrosis screening before or during pregnancy doesn't carry that same margin for confusion; it tells you and your partner your risk months earlier, while the widest range of choices are still availble to you.
Your Odds of Being a Cystic Fibrosis Carrier
About 1 in 29 people of Ashkenazi Jewish descent carries a gene change in the CFTR gene, and cystic fibrosis is also common across many other backgrounds, particularly people of Northern European descent, though it affects those in every ethnic group.⁵
Who Should Consider Cystic Fibrosis Testing?
Testing for cystic fibrosis is worth considering for individuals of all backgrounds and ethnicities well before you're expecting rather than after. Testing is especially appropriate if:
You Have Ashkenazi Jewish or Northern European Ancestry
Cystic fibrosis carrier rates are meaningfully elevated in both of these populations, about 1 in 29 for Ashkenazi Jewish descent specifically,⁵ which is often reason enough on its own, regardless of family history.
You're Planning Ahead of Pregnancy
Testing before you conceive gives you the most time to understand your results and the greatest range of options if you and your partner are both found to be carriers.
A Parent or Sibling Has Cystic Fibrosis or Is a Known Carrier
If cystic fibrosis runs in your family, your own chance of carrying the gene change is higher than average, and testing can help clarify your risk.¹
You've Been Evaluated for Unexplained Male Infertility
Some men with unexplained infertility are found to have a condition called congenital absence of the vas deferens (CBAVD), and a large share of those cases trace back to a change in CFTR, even when there are no other signs of cystic fibrosis.⁷ If this applies to you, genetic testing can uncover a connection you might not have expected, and it also means your partner should be tested to understand the chance of passing the condition on to a child.
You're Already Pregnant
Testing during pregnancy still gives you and your doctor time to plan, and can help guide next steps if needed.
Easy Steps from Home to Results
Order Your Kit
Register online and receive a saliva collection kit shipped directly to your home within a few days.
Collect Your Sample
Provide a saliva sample at home, following the instructions included in your kit.
Lab Analysis
Your sample is analyzed at a CLIA-accredited laboratory using DNA sequencing.
Receive Results
Receive your results within 3 to 4 weeks of your sample arriving at the lab. You can choose to schedule a complimentary consultation with a certified genetic counselor to review your findings, and we recommend doing so for any result other than a straightforward negative.
Affordable Access for Everyone
Insurance Billing
Self-Pay Option
Understanding Your Results
Positive (Carrier)
Negative
Get Cystic Fibrosis Carrier Screening
Frequently Asked Questions
Can you test for cystic fibrosis before pregnancy?
Yes. Cystic fibrosis screening can be done any time before or during pregnancy. Genetic carrier screening checks whether you and/or your partner carry a change in CFTR, the gene associated with cystic fibrosis.
What do cystic fibrosis genetic testing results mean?
Results generally fall into two categories. A negative result means you are very unlikely to be a carrier, though it can't rule out every possible change. A positive result means you carry one working and one nonworking copy of CFTR, with symptoms not expected to affect you personally.
If newborn screening already checks for cystic fibrosis, why get tested beforehand?
Newborn screening can miss cases of, or flag babies who don't actually have cystic fibrosis, which is why any positive result needs a follow-up sweat test to confirm a diagnosis.⁴ Cystic fibrosis screening, ideally before or during pregnancy, gives you and your partner a clearer picture months earlier, while you still have the full range of choices in front of you.
Can male infertility be related to cystic fibrosis?
Yes. A condition called congenital absence of the vas deferens is a common cause of unexplained male infertility, and a large share of those cases involve a change in CFTR, even without any other signs of cystic fibrosis being present.6 Genetic testing can identify this connection and clarify whether a partner should be tested as well.
How do you test for being a carrier of cystic fibrosis from home?
With genetic carrier screening via jscreen, the whole process happens from home. You order a kit online, provide a saliva sample using the instructions included, and mail it back using the prepaid materials in the kit. Your sample is analyzed at a CLIA-accredited laboratory, and results are typically available between 3 and 4 weeks of your sample arriving at the lab.
What happens if my partner and I are both carriers of cystic fibrosis?
Each pregnancy between the two of you would have a 25% chance of being affected by cystic fibrosis.¹ In that case, it is advisable to work with a genetic counselor to talk through your options, which can include prenatal diagnostic testing during a current pregnancy, in vitro fertilization with preimplantation genetic testing before conceiving, or other family planning approaches.
Still Have Questions?
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References
- Carrier Testing for Cystic Fibrosis. Cystic Fibrosis Foundation. Accessed August 25, 2026.
https://www.cff.org/intro-cf/carrier-testing-cystic-fibrosis - Rubin JL, McKinnon C, Ghizzi Pedra G, Morgan DA, Zweig K, Liou TG. Impact of CFTR Modulators on Longitudinal Cystic Fibrosis Survival and Mortality: Review and Secondary Analysis. Pulmonary Therapy. Published July 2025. Accessed August 25, 2026.
https://doi.org/10.1007/s41030-025-00303-4 - Cystic Fibrosis Medication Adds Significantly to Healthcare Costs. Managed Healthcare Executive. Last updated July 18, 2026. Accessed August 25, 2026.
https://www.managedhealthcareexecutive.com/view/cystic-fibrosis-medication-adds-significantly-to-healthcare-costs - Newborn Screening for CF. Cystic Fibrosis Foundation. Accessed August 25, 2026.
https://www.cff.org/intro-cf/newborn-screening-cf - CFTR-Related Conditions/Cystic Fibrosis. Norton & Elaine Sarnoff Center for Jewish Genetics. Last updated October 3, 2023. Accessed August 25, 2026.
https://www.jewishgenetics.org/genetic-disorders/search-genetic-disorders/cftr-related-conditions-cystic-fibrosis/ - Genetics of Male Infertility. Stony Brook Medicine. Accessed August 25, 2026.
https://www.stonybrookmedicine.edu/patientcare/urology/Genetics_of_male_infertility - Sorrentino U, Menegazzo M, Gabbiato I, Calosci D, Zambon CF, Zuccarello D. Challenges of Preimplantation Genetic Counselling in the Context of Cystic Fibrosis and Other CFTR-Related Disorders: A Monocentric Experience in a Cohort of 92 Couples. Genes. Published July 18, 2024. Accessed August 25, 2026.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11275312/