CHLORIDE, sweat (087-6923)
Synonyms: Sweat Test
CPT 4 Code: 89360
Medicare
NCD
Test Order Mnemonic: SWEAT CL
Lab: Clinical Chemistry
Request Form: C2
Collection: Iontophoresis
Causes for Rejection: QNS, bandage covering
collection site becomes non-occlusive during collection period.
Availability: Collection by Chemistry Laboratory
Technologist extension 23197, on a scheduled basis: Tuesday, Wednesday, Thursday at 9am or
1pm
Turnaround Time: Collection TAT within 48
hours (inpatients); analysis TAT is same day of collection
Special Instructions: Test must be scheduled with
the Clinical Chemistry Laboratory for proper collection.
Specimen: Sweat specimen after pilocarpine
iontophoresis (chemical stimulation)
Volume: Entire collection
Minimum Volume: 15 µL
Reference Ranges: Normal range is less than 40 mEq
Cl/L sweat. Patients with results above 40 should have repeat collections. Value greater
than 80 mEq Cl/L sweat is an abnormal value and is compatible with Cystic Fibrosis and
other diseases known to be associated with high Sweat Chloride result.
Reviewed/revised April 2007 by P. Harris
