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HelpTest Code CREA Creatinine with Estimated GFR (CKD-EPI 2021), Plasma or Serum
Additional Codes
LAB66
Performing Laboratory
Central Peninsula Hospital
Collection Method
Venipuncture
Container
Lt Green / Plasma Separator / Lithium Heparin
Specimen Type
Preferred
- Plasma- Light Green Top (Lithium heparin)
Acceptable
- Serum- Gold Top SST or Red Top
Minimum Volume
0.5ml
Specimen Stability
| Ambient | 7 days |
| Refrigerated (4°C to 8°C) | 7 days |
| Frozen(-40°C to 0°C) | 3 months |
Reference or Target Ranges
Creatinine
| Age | Male | Female |
|
0 days up to 7 days |
0.2-1.1 | 0.2-1.1 |
| 7 days up to 2 months | 0.1-0.6 | 0.1-0.6 |
|
2 months up to 2 years |
0.1-0.5 | 0.1-0.5 |
| 2 years up to 10 years | 0.1-0.7 | 0.1-0.6 |
| 10 years up to 14 years | 0.3-0.9 | 0.2-0.8 |
| >14 years | 0.7-1.30 | 0.5-1.10 |
EGFR- ≥60 mL/min/1.73m2
The formula for the 2021 CKD-EPI creatinine equation is:
- eGFR = 142 × min(SCr/κ,1)α × max(SCr/κ,1)-1.200 × 0.9938Age × 1.012 [if female]
This equation uses standardized serum creatinine (SCr), a kappa value (κ) based on sex (0.7 for females, 0.9 for males), an alpha value (α) based on sex (-0.241 for females, -0.302 for males), and age in years. "min" and "max" in the formula indicate the minimum and maximum of SCr/κ or 1, respectively.
- eGFR not calculated for age < 18 years
- Clinical practice guidelines suggest the use of serum cystatin C as a confirmatory test for eGFR 45-59 ml/min/1.73m2 in adults who do not have markers of kidney disease; eGFR may be less accurate in this range.
Reportable Units
mg/dL
Critical Value
Not defined for this assay
Reasons for Rejection
| Hemolysis Threshold | 800 mg/dL |
| Icterus Threshold |
5 mg/dL conjugated 10 mg/dL unconjugated |
| Lipemia Threshold | 1000 mg/dL |
| Other | QNS, contaminated, improperly labeled, improper specimen type |
Performance Information
| Days and Time Performed | 24/7 |
| Expected Turn Around Time |
Stat: 1 hour Routine: 4 hours |
| Stat Availability | Yes |
| Performing Bench | CPH Chemistry |
| Methodology/Method Description | Roche Cobas |
CPT Codes
82565
Last review/edit date
2025