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HelpTest Code LAB6078 Creatinine, Whole Blood
Performing Laboratory
St. Louis Children's Hospital Laboratory - Core Lab
Specimen Requirements
Patient Preparation: None
Collection Container/Tube:
Preferred: Air-tight balanced heparinized blood gas syringe (arterial or venous collection)
Acceptable: Heparinized Capillary blood gas tube or green microtainer
Submission Container/Tube: Not available to be sent from outside facilities
Specimen Collection Volume: 1.0 mL (minimum 0.3 mL)
Special Instructions: Miix well and send to lab immediately. If collecting in capillary blood gas tube be sure to add flea to mix.
Sample Rejection
Mislabled or unlabeled specimens
Clotted specimens
Logistics
Test Availability: Monday-Sunday
Cut-off time: None, performed as received
Turnaround Time: Same Day; 30 minutes from receipt in lab
Reference Values
Reference Interval:
| AGE | MALES | FEMALES |
| <6 years: | 0.1-0.6 mg/dL | 0.1-0.6 mg/dL |
| 6-13 years: | 0.2-0.8 mg/dL | 0.2-0.8 mg/dL |
| 13-19 years: | 0.4-1.2 mg/dL | 0.4-1.0 mg/dL |
| >or= 19 years: | 0.8-1.3 mg/dL | 0.6-1.1 mg/dL |
Critical Value: None established
Methodology
Potentiometry
Limitations
- NA
Additional Information
FOR SLCH CORE LABORATORY USE ONLY
Lab Processing Instructions: DO NOT SPIN. give specimen directly to blood gas bench for analysis
Processed Volume: 1.0 mL (minimum 0.3 mL) whole blood
Analyte Stability:
| Specimen Type | Temperature | Time |
|---|---|---|
| Whole Blood (unprocessed) | Ambient | 30 minutes |
| Plasma/Serum (processed) | Refrigerated | not acceptable |
| Ambient | not acceptable | |
| Frozen | not acceptable |
Test Classification and CPT Code
82565
LOINC
38483-4
Last Reviewed
06/2025