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CFTR Mutation Analysis in Whole Blood

Published: August 9, 2026Updated: August 16, 2026

This test checks for genetic mutations linked to cystic fibrosis (CF) by examining DNA from your blood. It helps determine if you carry CFTR gene changes that may cause the condition or increase your risk.

Quick summary

["This test identifies potential genetic causes of cystic fibrosis or related risks through blood-based genetic analysis."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
50998-4
Short code
Num CFTR Mut Tested Bld/T
Synonyms
Num CFTR Mut Tested Bld/T
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
molgen
Specimen volume
3 mL
Stability
Room temperature: 4h, Refrigerated: 24h
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

What This Test Measures

The test looks for specific changes (mutations) in the CFTR gene, which is responsible for regulating salt and water balance in cells. These mutations can lead to cystic fibrosis or other respiratory/pancreatic issues. The blood sample provides DNA for analysis to detect these genetic variations.

Why It’s Done

Doctors may order this test if you have symptoms of cystic fibrosis (chronic lung infections, digestive problems, or unexplained weight loss), a family history of CF, or if you’re considering genetic counseling. It can also be part of newborn screening programs in some regions.

Sample Collection and Process

A small blood sample is drawn from your arm. The blood is sent to a lab where DNA is extracted and screened for known CFTR mutations using advanced genetic testing techniques. Results are typically available within 1–2 weeks.

What to Expect Before the Test

No special preparation is needed, but inform your doctor about any medications you’re taking, especially those that affect blood clotting. Avoid strenuous activity 24 hours before the test if instructed.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CFTR Mutation Test (Blood)

Frequently asked questions

If mutations are found, they may confirm a diagnosis of cystic fibrosis or indicate a higher risk for related health issues. Some mutations are more strongly linked to CF than others, and results can guide treatment plans or family planning decisions. False positives or negatives are rare but possible with genetic testing.
This test provides critical information about your genetic makeup related to cystic fibrosis. If you have a family history of CF or symptoms, it can help your doctor assess your risk and plan appropriate care. Results may also impact decisions about pregnancy or genetic counseling for future generations.
How long does it take to get results?
Results typically take 1–2 weeks, but this can vary depending on lab processing times and whether additional testing is needed. Your healthcare provider will contact you once results are ready.
What if my test shows a mutation linked to cystic fibrosis?
If mutations are found, your doctor will discuss next steps, which may include further testing, a diagnosis, or guidance on managing symptoms or genetic counseling. Some mutations are associated with milder symptoms or may not cause CF, so results are always interpreted with clinical context.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy