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Sweat Test - Results
About this test
A sweat test measures the amount of salt chemicals (sodium and chloride) in sweat. Generally, chloride (sweat chloride) is measured.
Results are usually available in 1 or 2 days. Normal results vary from lab to lab.
| Normal: | Less than 40 millimoles per liter (mmol/L) |
|---|---|
| Borderline: | 40–59 mmol/L |
| Abnormal: | 60 mmol/L or more |
| Normal: | Less than 30 mmol/L |
|---|---|
| Borderline: | 30-59 mmol/L |
| Abnormal: | 60 mmol/L or more |
Many conditions can change sodium and chloride levels. Your health professional will discuss any significant abnormal results with you in relation to your symptoms and medical history.
The test results do not indicate how severe the cystic fibrosis is. The test only shows if a person could have the disease.
Abnormal (high) values
High values:
- Usually mean a person has cystic fibrosis. Some people with cystic fibrosis have borderline or even normal sweat chloride levels.
- May be caused by other conditions. But the sweat test is
not used to diagnose these conditions, which include:
- Adrenal gland problems, such as adrenal insufficiency or Addison's disease.
- Hypothyroidism.
- Kidney failure.
| By: | Healthwise Staff | Last Revised: June 23, 2009 |
| Medical Review: | Michael J. Sexton, MD - Pediatrics Susanna McColley, MD - Pediatric Pulmonology | |
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