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# A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Sweat Chloride
Test Code: SWET-CL
Synonyms/Keywords
Iontophoresis, CF Sweat Test​
Useful For
Analysis of sweat for chloride is a reliable test to aid in the diagnosis of Cystic Fibrosis in conjunction with the presence of chronic obstructive respiratory disease and/or intestinal malabsorption.  This test generally becomes positive in affected infants between 3-5 weeks of age.   Test is not recommended on infants less than 48 hours old.​
Specimen Requirements
Fasting Required Specimen Type Preferred Container/Tube Acceptable Container/Tube Specimen Volume Specimen Minimum Volume
(allows for 1 repeat)
Pediatric Minimum Volume
(no repeat)
No​ Sweat​ See Clinical Manual Minimum acceptable sweat volume is 30 mg each arm​ Minimum acceptable sweat volume is 30 mg each arm​ Minimum acceptable sweat volume is 15 mg each arm​
Collection Processing Instructions
Call Clinic Central Lab (ext. 16691) to schedule the test with Clinical Manual.  Clinical Manual personnel will collect the sweat specimen.  ​
Specimen Stability Information
Specimen Type Temperature Time
Sweat​ ​ Cannot be stored​
Rejection Criteria
​​If less than 15 mg sweat is obtained, the ordering physician will be notified for rescheduling of the test.
Performing Laboratory Information
Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
Marshfield​ Monday through Friday, started before 1400 hours​ 1-2 hours​ Iontophoresis stimulation, Chloride titration with ChloroCheck Chloridometer​
Reference Range Information
Performing Location Reference Range
Marshfield​
For individuals of all ages:
≤ 29 mmol/L:  CF unlikely
30-59 mmol/L:  intermediate
≥ 60 mmol/L:  indicative of CF.
 
Note: Sweat chloride values less than 30 mmol/L have been documented in genetically proven CF patients. Clinical correlation is necessary.
Interpretation
Note: Sweat chloride values less than 30 mmol/L have been documented in genetically proven CF patients. Clinical correlation is necessary.
Outreach CPTs
CPT Modifier
(if needed)
Quantity Description Comments
82438​ Chloride, other source​
89230​ Collection​
Synonyms/Keywords
Iontophoresis, CF Sweat Test​
Ordering Applications
Ordering Application Description
​Centricity ​Sweat Chloride
​Cerner ​None
If the ordering application you are looking for is not listed, contact your local laboratory for assistance.
Specimen Requirements
Fasting Required Specimen Type Preferred Container/Tube Acceptable Container/Tube Specimen Volume Specimen Minimum Volume
(allows for 1 repeat)
Pediatric Minimum Volume
(no repeat)
No​ Sweat​ See Clinical Manual Minimum acceptable sweat volume is 30 mg each arm​ Minimum acceptable sweat volume is 30 mg each arm​ Minimum acceptable sweat volume is 15 mg each arm​
Collection Processing Instructions
Call Clinic Central Lab (ext. 16691) to schedule the test with Clinical Manual.  Clinical Manual personnel will collect the sweat specimen.  ​
Specimen Stability Information
Specimen Type Temperature Time
Sweat​ ​ Cannot be stored​
Rejection Criteria
​​If less than 15 mg sweat is obtained, the ordering physician will be notified for rescheduling of the test.
Useful For
Analysis of sweat for chloride is a reliable test to aid in the diagnosis of Cystic Fibrosis in conjunction with the presence of chronic obstructive respiratory disease and/or intestinal malabsorption.  This test generally becomes positive in affected infants between 3-5 weeks of age.   Test is not recommended on infants less than 48 hours old.​
Reference Range Information
Performing Location Reference Range
Marshfield​
For individuals of all ages:
≤ 29 mmol/L:  CF unlikely
30-59 mmol/L:  intermediate
≥ 60 mmol/L:  indicative of CF.
 
Note: Sweat chloride values less than 30 mmol/L have been documented in genetically proven CF patients. Clinical correlation is necessary.
Interpretation
Note: Sweat chloride values less than 30 mmol/L have been documented in genetically proven CF patients. Clinical correlation is necessary.
For more information visit:
Performing Laboratory Information
Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
Marshfield​ Monday through Friday, started before 1400 hours​ 1-2 hours​ Iontophoresis stimulation, Chloride titration with ChloroCheck Chloridometer​
For billing questions, see Contacts
Outreach CPTs
CPT Modifier
(if needed)
Quantity Description Comments
82438​ Chloride, other source​
89230​ Collection​
For most current information refer to the Marshfield Laboratory online reference manual.