Sign in →

Test Code CL Sweat Chloride, Sweat

Important Note

Note: This test is for chloride testing on sweat collected offsite only.

Clinical System Name

Chloride, Sweat

Sample Requirements

Specimen: Sweat

Container(s): 0.2 mL microcentrifuge tube

Preferred Vol: 0.25 mL

Minimum Vol:  0.25 mL


Two samples are preferred from 2 different collection sites (ie. left and right arm). Sweat samples from different collection sites cannot be combined. Both samples will be ordered under one accession number; one value reported.


Note: This test is for chloride testing on sweat collected offsite only. Contact Chemistry Lab for more information (206) 987-3860. Please use the procedure start time as the time of collection during test order entry.

Processing Instructions

Reject due to

Spin: N

Aliquot: N

Temp: -20 C

Storage location: CPA Freezer, Fz5 Rack.


Off-site collection: Parafilm sample.  Freeze sample and ship frozen.  


Specimen Type Temperature Time
sweat Room temp

72 h

  Refrigerated 72 h

1 m



STAT Performed TAT

M - F, day shift

1 -3 d


Specimens received by 11 am are assayed the same day.

Performing Laboratory

Seattle Children's Laboratory


Department:  Chemistry

Location: Chem East

Phone Number:  (206)987-3860




Reference Range


Normal (mEq/L) <30
Borderline/Indeterminate (mEq/L) 30 - 59
Consistent with the diagnosis of CF (mEq/L)  ≥60




Method: Iontophoresis/ Digital chloridometer

Analytical Volume: 0.15 mL


CPT Codes