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?