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Epic Code LAB9980 Sweat Chloride Analysis

Important Note

Testing must be scheduled in advance.

As soon as the PCP receives a positive screen from the State of Michigan, please call HDVCH Direct (616-391-2345) and fax sweat chloride prescription to (616 267-2661). Pulmonary and genetic counselor appointments will be coordinated during that call. 

More information on scheduling may be found here: HDVCH Referrals

Test Name Alias

Sweat Chloride | 8980

Interface Order Alias

10255

Clinical Information

Sweat chloride concentrations in normal and cystic fibrosis patients vary somewhat with age and between different reported series. The ranges listed are consensus of values most often reported in published studies.

Specimen Requirements

Specimen Type: Sweat collection performed at time of testing.

Special Instructions

Testing must be scheduled in advance (SHRL lab only). To schedule, please call (616) 267-2660, Monday through Friday between 8 am and 4:30 pm. *For INPATIENT, if transcription is unavailable contact Chemistry department (first shift only). 

 

The following information is needed when scheduling:

Patient’s Name and Age, Ordering physician, Diagnosis, written orders are required to proceed with collection.

 

Children need to be well hydrated and should drink extra fluid the day of the test; infants should feed within one hour of the appointment.

 

Bring warm clothes, blankets, or jackets along even in the warm weather to facilitate sweating.

 

Avoid any skin lotions or creams for 24 hours before the test.

 

If your child has new vomiting or diarrhea within 24 hours of the test, please call and reschedule.

Specimen Stability

Ambient: 72 hours

Refrigerated: 72 hours

Frozen: Not acceptable

Laboratory Retention: N/A

Test Frequency

Test is scheduled Monday, Tuesday and Wednesday between 09:00-11:00. Performed at Spectrum Health Regional Laboratory only. 1 newborn screen appointment available on Friday's at 10:00.

 

Certain time slots are available for newborn screens.

 

Usual TAT 1 day.

Reference Range

CF Unlikely Indeterminate Indicative of CF
<30 mmol/L 30 - 59 mmol/L >59 mmol/L

 

Cystic fibrosis has been diagnosed in individuals with sweat chlorides less than 30 mmol/L.  Clinical correlation is necessary.

Performing Department

Chemistry

Performing Department Laboratory Location

Corewell Health Reference Laboratory, Grand Rapids, MI

Methodology

Pilocarpine Iontophoresis - collection method

Coulometry - analysis method

CPT

89230, 82438

CDM Code

3008923001, 3018243802

Epic Test ID

1230101195

LOINC

Sweat Chloride Left: 56448-4

Sweat Volume Left: 33514-1

Sweat Interp Left: 56850-1

Sweat Chloride Right: 56448-4

Sweat Volume Right: 33514-1

Sweat Interp Right: 56850-1

Sweat Comment: 8251-1

Reviewed Date

3/7/2024

Updated Date

3/17/2024 – Reference Range