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Chloride
Test Code330
CPT Codes
82435
Preferred Specimen
1 mL serum collected in a serum separator tube (SST)
Minimum Volume
0.5 mL
Other Acceptable Specimens
Plasma collected in: sodium or lithium heparin (green-top) tube
Transport Temperature
Room temperature
Specimen Stability
Room temperature: 7 days
Refrigerated: 7 days
Frozen: 28 days
Refrigerated: 7 days
Frozen: 28 days
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Anticoagulants other than heparin
Methodology
Ion Selective Electrode (ISE)
Setup Schedule
Set up: Daily; Report available: Next day
Limitations
Patients recently exposed to bromide may have elevated results.
Reference Range
98-110 mmol/L
Clinical Significance
Serum chloride is the major extracellular anion and counter-balances the major cation, sodium, maintaining electrical neutrality of the body fluids. Two thirds of the total anion concentration in extracellular fluids is chloride and it is significantly involved in maintaining proper hydration and osmotic pressure. Movement of chloride ions across the red blood cell membrane is essential for the transport of biocarbonate ions in response to changing concentrations of carbon dioxide. Chloride measurements are used in the diagnosis and treatment of electrolyte and metabolic disorders such as cystic fibrosis and diabetic acidosis.