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HelpTest Code LAB59 Chloride, Plasma
Performing Laboratory
St. Louis Children's Hospital Laboratory - Chemistry
Specimen Requirements
Note: This test is also available as part of LAB17, Comprehensive Metabolic Panel (CMP); LAB15, Basic Metabolic Panel; LAB16, Electrolyte (Lytes) Panel; and LAB19 Renal Function Panel. See Common Panel Test Combinations to avoid duplicate requests if needed.
Patient Preparation: None
Collection Container/Tube:
Preferred: Mint green-top lithium heparin (MNTGRN LiHep) tube
Acceptable: Green samplette/microtainer, plain red-top tube, or Gold SST gel tube
Specimen Collection Volume: 1.0 mL (minimum 0.6 mL)
Submission Container/Tube: If specimen is coming from outside facility and collected in a microtainer or plain red-top tube, aliquot processed sample into a plastic vial for transport (labeling with specimen type).
Special Instructions: None
Sample Rejection
Mislabled or unlabeled specimens
Logistics
Test Availability: Monday-Sunday
Cut-off time: None, performed as received
Turnaround Time: Same Day; 2 hours from receipt in performing lab
Reference Values
Reference Interval:
| <18 years: | 100-114 mmol/L |
| ≥18 years: | 97-110 mmol/L |
Critical Value: <or=75 mmol/L OR >130 mmol/L (all ages)
Critical test results will be called back automatically initially and every 24 hours thereafter.
Methodology
Ion-Selective Electrode (ISE)
Limitations
NA
Additional Information
FOR SLCH CORE LABORATORY USE ONLY
Lab Processing Instructions: Centrifuge to separate. If specimen is collected in microtainer or plain red-top tubealiquot sample into a Roche false-bottom tube for testing (labeling aliquot with specimen type).
Processed Volume: 0.3 mL plasma/serum
Analyte Stability:
| Specimen Type | Temperature | Time |
|---|---|---|
| Whole Blood (unprocessed) | Ambient | 24 hours |
| Plasma/Serum (processed) | Refrigerated (preferred) | 4 weeks |
| Ambient | 7 days | |
| Frozen | indefinitely |
Test Classification and CPT Code
82435
LOINC
2075-0
Last Reviewed
06/2025