How is a cystic fibrosis sweat test performed?

In a cystic fibrosis sweat test (sweat chloride test), a sweat-producing chemical is applied to a small area of skin and the collected sweat is then tested to see if it's saltier than normal. The sweat chloride test is usually done when the infant is a month old to ensure the sample is large enough to be analyzed. The sweat test can determine if the infant carries the cystic fibrosis gene or has the condition. Other tests to diagnose cystic fibrosis include taking DNA samples from blood or saliva, which can be checked for specific defects on the gene responsible for cystic fibrosis.

Continue Learning about Lab Tests

What is a sickle cell solubility test?
Dr. Jack Merendino, MDDr. Jack Merendino, MD
A sickle cell solubility test is a quick test to screen for sickle cell disease or sickle trait. “So...
More Answers
What is a fecal occult blood test?
Dr. Grace H. Elta, MDDr. Grace H. Elta, MD
A fecal occult blood test (FOBT) is used to find small amounts of hidden (occult) blood in the stool...
More Answers
What is the process for getting a blood sample taken?
Jumo HealthJumo Health
Blood samples are taken by a doctor, nurse or another healthcare professional. The process for getti...
More Answers
How often should my homocysteine levels be checked?
Dr. Michael Roizen, MDDr. Michael Roizen, MD
If a person has severe vascular disease or arterial aging disease, such as stroke, heart attack, per...
More Answers

Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.