Cystic fibrosis sweat test

This test measures the concentration of chloride in sweat from the body. This test is used to diagnose cystic fibrosis.

Laboratory tests may be done for many reasons. Tests are performed for routine health screenings or if a disease or toxicity is suspected. Lab tests may be used to determine if a medical condition is improving or worsening. Lab tests may also be used to measure the success or failure of a medication or treatment plan. Lab tests may be ordered for professional or legal reasons. You may need this test if you have:

• CF - Cystic fibrosis

Do not apply creams or lotions to your child’s skin for 24 hours before the sweat test.

A sweat test generally takes about 45 minutes to complete. Your child’s skin will be cleaned and a special chemical that causes sweating will be applied to a small patch of skin on your child’s arm or leg. Adhesive patches called electrodes will be placed on the arm or leg. For about five minutes, the electrodes transmit a very weak electrical current that causes sweating.

The pads are then removed and the area washed. A dry pad will then be placed on the same area where the electrodes were. It is covered in a special plastic which traps any sweat produced. After 30 to 40 minutes, the pad will be removed and the sweat in it will be collected.

During a sweat test, your child may feel a warm or tickling sensation. This test is usually not painful or uncomfortable.

There are no special instructions to follow after this test.

You have the right to help plan your care. To help with this plan, you must learn about your health condition and how it may be treated. You can then discuss treatment options with your caregivers. Work with them to decide what care may be used to treat you. You always have the right to refuse treatment.