A 28-year-old woman with a known history of systemic lupus erythematosus (SLE) presents to the clinic with bilateral lower extremity edema and new-onset hypertension (blood pressure 152/94 mmHg). A preliminary urine dipstick in the clinic shows 3+ protein. She is suspected of having lupus nephritis. Arrange the following steps in the appropriate clinical sequence for the diagnostic evaluation and long-term pharmacological management of this patient's renal condition, from first to last.
- 1Perform a formal urinalysis and quantify proteinuria using a spot urine protein-to-creatinine ratio.
- 2Perform a percutaneous renal biopsy to determine the specific histologic class of lupus nephritis.
- 3Initiate induction therapy with high-dose glucocorticoids combined with mycophenolate mofetil or cyclophosphamide.
- 4Transition to maintenance therapy with low-dose glucocorticoids and a steroid-sparing immunosuppressant.
Answer
The correct sequence is to first quantify the proteinuria, then obtain a renal biopsy for histologic classification, followed by induction immunosuppression, and finally transition to maintenance therapy.
The standard of care for new-onset lupus nephritis involves confirming the renal involvement non-invasively, followed strictly by a biopsy before starting toxic immunosuppressive therapies. The biopsy determines the class of disease, which dictates induction therapy. Once the acute flare is controlled, maintenance therapy is used to prevent relapse.
Step-by-Step Solution
Key Concept
The management of suspected lupus nephritis follows a strict sequence: confirm renal involvement with non-invasive testing, perform a biopsy to establish the histologic class, initiate potent induction therapy for active disease, and follow with lower-toxicity maintenance therapy.