eGFR (Estimated GFR)

Metabolic

What This Test Measures

Estimated kidney filtration rate calculated from creatinine; the primary measure of kidney function stage.

Preparation

No fasting required
No special prep. Avoid high-protein meals and strenuous exercise 24 hours before testing — both can elevate creatinine and BUN.

General guidelines only. Requirements vary by lab and individual. Confirm with your provider before adjusting any medications.

Turnaround Time

Varies by lab

Clinical Notes

CKD-EPI equation now standard; eGFR <60 for >3 months = CKD

ICD-10 Codes

Common diagnosis codes associated with this test. Codes are assigned by your provider.

E11.9Type 2 diabetes mellitus without complications
I10Essential (primary) hypertension
N17.9Acute kidney failure, unspecified
N18.9Chronic kidney disease, unspecified

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Related Tests

BUN (Blood Urea Nitrogen)

CPT: 84520

Creatinine, Serum

CPT: 82565

eGFR (CKD-EPI)

Microalbumin:Creatinine Ratio (ACR)

CPT: 82043, 82570

Urine Creatinine

CPT: 82570

BUN/Creatinine Ratio

CPT: 80048

For informational purposes only

This page is for educational and research purposes only and does not constitute medical advice, diagnosis, or treatment recommendations. ICD-10 and CPT codes are assigned by your healthcare provider. Always consult a qualified healthcare provider before ordering any lab test or making decisions about your health.