Interpretation of eGFR 82 mL/min/1.73m²
An eGFR of 82 mL/min/1.73m² represents normal to mildly decreased kidney function (CKD-EPI G1 or G2 category) and does not define chronic kidney disease unless other markers of kidney damage are present, such as albuminuria, structural abnormalities on imaging, or persistent abnormalities for ≥3 months. 1
Clinical Classification
This eGFR falls within the normal range for many adults, particularly those over age 40, as GFR physiologically declines with aging from young adult values of 100-130 mL/min/1.73m² in men and 90-120 mL/min/1.73m² in women. 1
The threshold for defining CKD is eGFR <60 mL/min/1.73m², representing loss of half or more of normal adult kidney function. 1 Your patient's eGFR of 82 is well above this threshold.
An eGFR >60 mL/min/1.73m² does not exclude kidney disease if other markers of kidney damage are present, such as albuminuria (urine albumin-to-creatinine ratio), hematuria, or structural abnormalities. 1, 2
Essential Next Steps
You must assess for albuminuria to complete the CKD evaluation:
Measure urine albumin-to-creatinine ratio (UACR) in a random spot urine collection to determine if kidney damage is present despite preserved GFR. 3
CKD requires persistent abnormalities for ≥3 months, so a single eGFR measurement should not be used to diagnose or exclude kidney disease. 1 Repeat testing is necessary if clinical suspicion exists.
If UACR is normal and no other kidney damage markers exist, this patient likely has normal kidney function and does not have CKD.
Risk Stratification and Monitoring
If this patient has diabetes:
Screen for albuminuria annually as diabetic kidney disease may be present at diagnosis of type 2 diabetes or typically develops 5-15 years after type 1 diabetes diagnosis. 3
Fast GFR decline (>5 mL/min/1.73m² per year) can occur even with preserved baseline eGFR, particularly in patients with diabetes, hypertension, older age, or African-American race. 4
Monitor for progression:
The frequency of eGFR and albuminuria monitoring should increase with severity of kidney disease, though specific intervals are not evidence-based. 3
A decline of even <25% in eGFR is associated with increased risk of all-cause mortality and ESRD, so any consistent downward trend warrants attention. 3
Important Caveats
Several factors can affect eGFR accuracy:
Extremes of muscle mass or weight can produce inaccurate estimates. 1
Non-steady state conditions such as acute illness, recent surgery, or dehydration may yield misleading values. 1
The CKD-EPI equation is more accurate than the MDRD equation at eGFR levels >60 mL/min/1.73m², with 61% improvement in bias for eGFR 60-89 mL/min/1.73m² and 75% improvement for eGFR 90-119 mL/min/1.73m². 5
Management at This eGFR Level
No CKD-specific interventions are indicated at eGFR 82 mL/min/1.73m² unless albuminuria or other kidney damage is present:
Nephrology referral is not indicated at this eGFR level; referral thresholds are eGFR <30 mL/min/1.73m² or significant proteinuria. 3, 6
Patient education about kidney disease and treatment options should begin when patients reach CKD stage 4 (eGFR <30 mL/min/1.73m²). 3, 6
If diabetes is present with albuminuria, consider SGLT2 inhibitors and ACE inhibitors/ARBs for kidney and cardiovascular protection, even at this preserved eGFR level. 3