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CHLORIDE, sweat (LAB000395)
Test Mnemonic:

SWEAT CL

Specimen Requirements:
Collection:

Iontophoresis.  Sweat collection performed by clinical chemistry laboratory technologist. (Min: 15 uL of sweat).

Container:

Sweat is collected by the laboratory using a macroduct coil.

Minimum Volume:

15ul

Specimen Preparation:

Sweat specimen collected after pilocarpine iontophoresis (chemical stimulation).

Stability:

Sweat is assayed ASAP after collection and is stable for up to 72 hours.

Causes for Rejection:

QNS specimen and bandage covering collection site becomes non-occlusive during collection period.                           

Reference Range:

<=40 mEq Cl/L Sweat

Turnaround Time:

Collection TAT within 48 hours (inpatients); Analysis TAT is same day of collection  

Methodology:

Macroduct collection/chloridometer titration  

Performed:

Special Chemistry    

Clinical Indication:

Sweat chloride is measured when cystic fibrosis is suspected.

CPT 4 Code:

89230

Note:

Test must be scheduled with the clinical chemistry laboratory. Call  extension 29222.  Test is only performed on Monday through Friday from 9am to 1pm. 

When ordering tests for which Medicare or Medicaid reimbursement will be sought, physicians should only order tests that are medically necessary for the diagnosis or treatment of the patient. Components of the organ or disease panels may be ordered individually. The diagnostic information must substantiate all tests ordered and must be in the form of an ICD-10 code or its verbal equivalent.
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