A 31-year-old member asked:
How frequent are false positives on cystic fibrosis tests?
1 doctor answer • 4 doctors weighed in
Pediatric Pulmonology 18 years experience
As high as 15%: The sweat chloride test is still the gold standard diagnostic test for cystic fibrosis. The accuracy of this test is highly dependent on the method used and the lab it is performed in. I only trust a result that is performed in a center that is certified by the cystic fibrosis foundation. Some reasons for false positives include: lab error, malnutrition, & eczema.
5.6k viewsReviewed >2 years ago
A 48-year-old member asked:
How typical are false positives on cystic fibrosis tests?
2 doctor answers • 4 doctors weighed in
Dr. David Escobaranswered
Family Medicine 9 years experience
Not Typical: Certain rare conditions can also lead to high sweat chloride levels (the gold standard test for cystic fibrosis). However, these rare conditions (there's a list) will cause the patient to exhibit different symptoms than those consistent with cystic fibrosis, so the sweat chloride test is considered to be reliable in diagnosing CF in conjunction with the patient's history and physical exam.
6.2k viewsReviewed >2 years ago
A 33-year-old member asked:
How common are false positives with cystic fibrosis tests?
3 doctor answers • 12 doctors weighed in
Pediatrics 47 years experience
6.4k viewsAnswered >2 years ago
Last updated Apr 8, 2015
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