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In cystic fibrosis, the CFTR chloride channel is defective, and does not allow chloride to be reabsorbed into sweat duct cells. Consequently, more sodium stays in the duct, and more chloride remains in the sweat. The concentration of chloride in sweat is therefore elevated in individuals with cystic fibrosis.
The first commercially adopted use for sweat diagnostics included testing of sodium and chloride levels in children for the diagnosis of cystic fibrosis. Today, one of the most popular devices for this testing is the Macroduct Sweat Collection System from ELITechGroup. [11]
Hyperchloremia is an electrolyte disturbance in which there is an elevated level of chloride ions in the blood. [1] The normal serum range for chloride is 96 to 106 mEq/L, [2] therefore chloride levels at or above 110 mEq/L usually indicate kidney dysfunction as it is a regulator of chloride concentration. [3]
Once carbon dioxide levels return to base line, the higher bicarbonate levels reveal themselves putting the patient into metabolic alkalosis. [citation needed] Cystic fibrosis – excessive loss of sodium chloride in the sweat leads to contraction of the extracellular volume in the same way as contraction alkalosis, as well chloride depletion. [6]
In sweat glands, defective CFTR results in reduced transport of sodium chloride and sodium thiocyanate [21] in the resorptive duct and therefore saltier sweat. This is the basis of a clinically important sweat test for cystic fibrosis often used diagnostically with genetic screening. [22]
The normal blood reference range of chloride for adults in most labs is 96 to 106 milliequivalents (mEq) per liter. The normal range may vary slightly from lab to lab. Normal ranges are usually shown next to results in the lab report. A diagnostic test may use a chloridometer to determine the serum chloride level.
A record-setting heat blast that swept across the Midwest this week has been made worse by the region's vast fields of cornstalks. Through a natural process commonly called "corn sweat," water ...
However, sweat as a diagnostic fluid presents numerous challenges as well, such as very small sample volumes and filtration (dilution) of larger-sized hydrophilic analytes. Currently the only major commercial application for sweat diagnostics is for infant cystic fibrosis testing based on sweat chloride concentrations. [citation needed]
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