Sweat Chloride Test aids in diagnosing cystic fibrosis. It maybe ordered in an individual with signs and symptoms of CF, or in someone who has a close relative, diagnosed with CF.
Signs and symptoms of cystic fibrosis include:
An immuno reactive trypsinogen test (IRT) is used to screen newborns for CF, when they have meconium ileus. Trypsinogen is an inactive form of an enzyme, produced by the pancreas. If IRT is positive, a Sweat Chloride Test is ordered.
CF gene mutation panel can be used to screen women or newborns, in order to assess if they carry an abnormal gene for the CFTR protein. If the individual tests negative on this panel, but still presents with symptoms giving rise to a CF suspicion, the physician may order a Sweat Test.
Sample required: Sweat sample
Process: A chemical that causes sweating is applied on a patch of skin on the arm or leg. A weak electrical current is applied over this area by placing electrodes. This is continued for a few minutes after which, the area is cleaned with a piece of gauze, or filter paper to collect the sweat. A plastic coil can also be used for sweat collection.
Preparation required: No topical creams or lotions should be applied to the skin, 24 hours before the test.
Autosomal Recessive: Autosomal recessive conditions are traits or disorders that occur when two copies of an abnormal gene have been inherited on a non-sex chromosome. If both parents have an autosomal recessive condition, there is a 100% likelihood of passing on the mutated genes to their children. If, however, only one mutant copy of the gene is inherited, the individual will be a carrier of the condition, but will not be present with any symptoms. Children born to two carriers, have a 25% chance of being homozygous dominant (unaffected), a 50% chance of being heterozygous (carrier), and a 25% chance of being homozygous recessive (affected).
Certain medications that you may be currently taking may influence the outcome of the test. Hence, it is important to inform your healthcare provider, the complete list of medications (including any herbal supplements) you are currently taking. This will help the healthcare provider interpret your test results more accurately and avoid unnecessary chances of a misdiagnosis.
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