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Renal Labs: FRACTIONAL EXCRETION OF SODIUM (FeNa)

Quiz by Made Easy Academy

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10 questions
Show answers
  • Q1
    What does a low Fractional Excretion of Sodium (FeNa) value typically indicate in kidney function assessment?
    Postrenal obstruction
    Acute tubular necrosis
    Chronic kidney disease
    Prerenal azotemia
    30s
  • Q2
    Which equation is used to calculate the Fractional Excretion of Sodium (FeNa)?
    FeNa = (Plasma Na x Urine Na) / (Urine Cr x Plasma Cr) x 100
    FeNa = (Urine Cr x Plasma Na) / (Plasma Cr x Urine Na) x 100
    FeNa = (Urine Na x Plasma Cr) / (Plasma Na x Urine Cr) x 100
    FeNa = (Plasma Cr x Urine Cr) / (Urine Na x Plasma Na) x 100
    30s
  • Q3
    In what clinical scenario would you expect a high Fractional Excretion of Sodium (FeNa) value, typically greater than 2%?
    Prerenal azotemia
    Acute tubular necrosis
    Heart failure
    Dehydration
    30s
  • Q4
    What is the primary purpose of measuring the Fractional Excretion of Sodium (FeNa) in patients with acute kidney injury (AKI)?
    To differentiate between prerenal and intrinsic renal causes of AKI
    To measure urine output
    To assess hydration status
    To evaluate electrolyte balance
    30s
  • Q5
    Which laboratory values are necessary to calculate the Fractional Excretion of Sodium (FeNa)?
    Serum potassium, urine sodium, serum creatinine, and urine urea
    Serum potassium, serum creatinine, urine potassium, and urine creatinine
    Serum sodium, urine urea, serum urea, and urine creatinine
    Serum sodium, serum creatinine, urine sodium, and urine creatinine
    30s
  • Q6
    What FeNa value is typically associated with prerenal azotemia in patients with acute kidney injury?
    FeNa = 5\%
    FeNa > 3\%
    FeNa < 1\%
    FeNa = 1\%
    30s
  • Q7
    What does a Fractional Excretion of Sodium (FeNa) value between 1% and 2% typically suggest?
    Definitive prerenal azotemia
    Indeterminate, could be either prerenal or intrinsic kidney injury
    Definitive postrenal obstruction
    Definitive intrinsic renal damage
    30s
  • Q8
    Why is it important to evaluate the Fractional Excretion of Sodium (FeNa) in the context of acute kidney injury (AKI)?
    To assess liver function
    To guide the management and treatment decisions
    To monitor blood pressure changes
    To diagnose chronic kidney disease
    30s
  • Q9
    What would a very high FeNa value (>3%) likely indicate in a patient with acute kidney injury?
    Acute tubular necrosis
    Prerenal azotemia
    Diabetic nephropathy
    Chronic kidney disease
    30s
  • Q10
    In a patient with suspected acute kidney injury, which of the following factors would most significantly impact the interpretation of a low FeNa value?
    Age of the patient
    Recent antibiotic use
    History of diabetes
    Volume status
    30s

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