S1E36 Renal Reality Check: Decoding Kidney Function Tests

What this episode covers

Not all kidneys fail loudly. Sometimes the earliest signs are hidden in the labs — if you know where to look. In this episode, we go deep into renal function testing, breaking down how to spot trouble early, stage chronic kidney disease accurately, and make sense of the numbers that don’t always tell the full story. Whether you're monitoring a dialysis patient or picking up subtle trends in a post-op patient, this episode equips you with the clinical insight to interpret renal labs with confidence.Key Topics Covered:GFR (Glomerular Filtration Rate):Why it’s the gold standardEstimated vs measured GFRCreatinine vs cystatin CLimitations and influencing factors (age, muscle mass, etc.)KDIGO CKD Staging:GFR and albuminuria categoriesClinical relevance in guiding treatmentCreatinine and BUN:What they measure and what they missBUN/Cr ratio and what it tells you about prerenal vs intrinsic causesAlbuminuria/Proteinuria:Spot urine vs 24-hour collectionWhy microalbuminuria mattersUrinalysis (UA):Key elements: Specific gravity, pH, protein, casts, sedimentClues for glomerular vs tubular vs post-renal pathologyTubular Function Tests:Fractional excretion of sodium (FeNa), urine osmolality, and concentrating abilityClinical Pearls:How hydration, medications, and diet can skew resultsWhen to question the numbers and what to do nextNursing implications for trending renal labs, fluid management, and alerting providers

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