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HelpTest Code CRTS1 Creatinine with Estimated Glomerular Filtration Rate (eGFR), Serum
Necessary Information
Patient's age and sex are required.
Specimen Required
Collection Container/Tube:
Preferred: Serum gel
Acceptable: Red top
Submission Container/Tube: Plastic vial
Specimen Volume: 0.5 mL
Collection Instructions:
1. Serum gel tubes should be centrifuged within 2 hours of collection.
2. Red-top tubes should be centrifuged and the serum aliquoted into a plastic vial within 2 hours of collection.
Useful For
Diagnosing and monitoring treatment of acute and chronic kidney diseases
Adjusting dosage of renally excreted medications
Monitoring kidney transplant recipients
Estimating glomerular filtration rate for people with chronic kidney disease (CKD) and those with risk factors for CKD (diabetes, hypertension, cardiovascular disease, and family history of kidney disease)
Reporting Name
Creatinine with eGFR, SSpecimen Type
SerumSpecimen Minimum Volume
0.5 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Serum | Refrigerated (preferred) | 7 days | |
| Frozen | 90 days | ||
| Ambient | 24 hours |
Reject Due To
| Gross hemolysis | Reject |
Reference Values
CREATININE
Males(1)
0-11 months: 0.17-0.42 mg/dL
1-5 years: 0.19-0.49 mg/dL
6-10 years: 0.26-0.61 mg/dL
11-14 years: 0.35-0.86 mg/dL
≥15 years: 0.74-1.35 mg/dL
Females(1)
0-11 months: 0.17-0.42 mg/dL
1-5 years: 0.19-0.49 mg/dL
6-10 years: 0.26-0.61 mg/dL
11-15 years: 0.35-0.86 mg/dL
≥16 years: 0.59-1.04 mg/dL
ESTIMATED Glomerular Filtration Rate (eGFR)
≥18 years old: ≥60 mL/min/BSA (body surface area)
Note: eGFR results will not be calculated for patients younger than 18 years old.
Estimated GFR calculated using the 2021 CKD-EPI creatinine equation
2021 CKD-EPI creatinine eGFR not valid for patients younger than 18 years old.
Day(s) Performed
Monday through Sunday
Report Available
Same day/1 to 2 daysSpecimen Retention Time
1 weekPerforming Laboratory
Mayo Clinic Laboratories in Rochester
CPT Code Information
82565
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| CRTS1 | Creatinine with eGFR, S | 45066-8 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| CRTSA | Creatinine, S | 2160-0 |
| EGFR1 | Estimated GFR (eGFR) | 98979-8 |
Forms
If not ordering electronically, complete, print, and send a Renal Diagnostics Test Request (T830) with the specimen.