Evaluation and Management of Renal Impairment

Diagnostic Approach

For patients with reduced muscle mass, consider obtaining a timed urine collection for more accurate assessment of creatinine clearance, as recommended by the American College of Physicians 1
Urine albumin-to-creatinine ratio (UACR) should be used to quantify albuminuria, according to the American Diabetes Association 2
Complete blood count should be performed to assess for anemia, which may accompany chronic kidney disease, as stated by the European Society of Cardiology 3, 4
Renal ultrasonography should be used to evaluate kidney size, echogenicity, and rule out obstruction, as suggested by the American Association for the Study of Liver Diseases 5, 1

The American College of Cardiology recommends identifying and discontinuing potentially nephrotoxic medications, such as NSAIDs and certain antibiotics, in patients with impaired renal function 5, 1, 6
The American Heart Association suggests reviewing medications requiring dose adjustment for renal function, such as ACE inhibitors and ARBs, to prevent further kidney damage 1, 7

The American Diabetes Association recommends optimizing blood pressure control to reduce the risk of CKD progression, with a target blood pressure of <140/90 mmHg 2
For patients with non-dialysis dependent CKD, dietary protein intake should be approximately 0.8 g/kg body weight per day, as recommended by the National Kidney Foundation 2
Regular monitoring of serum creatinine, eGFR, electrolytes, and urinary albumin excretion is essential for patients with CKD, according to the American College of Physicians 2, 1

The National Kidney Foundation recommends referral to a nephrologist for patients with eGFR <30 mL/min/1.73m², persistent proteinuria, or abrupt sustained decrease in eGFR >20% after excluding reversible causes 8
The American Society of Nephrology suggests referral for patients with rapid progression of kidney disease, difficult to manage electrolyte abnormalities, or uncertain etiology of kidney disease 8