PAINE #PANCE Pearl – Renal



Question

42yo woman, with a history systemic lupus erythematosus, presents to your clinic with a 1-month history of progressive leg swelling and polyuria. She is complaint with her medications and states that she hasn’t changed anything in her medical care. Physical examination reveals 2+ pitting edema to the knees in the lower extremities. BMP, UA, and urine microscopy are below.

  1. What is the next step in diagnosing this patient and what would you expect to find?


Answer

This patient found to heavy proteinuria on a urinalysis and oval fat bodies on urine microscopy, which would point to nephrotic syndrome as a diagnosis.

The next step in the diagnostic management of this patient would be to perform a 24-hour urine collection for urine protein. Normal urine protein excretion is < 150mg/day, but nephrotic range proteinuria is diagnostic at > 3.5g/day. Alternatively, a random urine protein-to-creatinine ratio of > 3.5 can be used, but is less reliable than a 24-hour collection.

Once a nephrotic syndrome diagnosis is made by urine studies, it should be followed up with a renal biopsy to determine the cause.

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