Bad prognostic factors in Lupus Nephritis –
**Core Concept**
Lupus Nephritis (LN) is a common and serious complication of Systemic Lupus Erythematosus (SLE), characterized by inflammation of the kidneys. The prognosis of LN can be predicted by various clinical and pathological factors.
**Why the Correct Answer is Right**
The presence of class IV (diffuse proliferative lupus nephritis) or class V (membranous lupus nephritis) glomerulonephritis on renal biopsy is associated with a poorer prognosis. These classes of nephritis are characterized by extensive glomerular damage and scarring, which can lead to chronic kidney disease and end-stage renal disease. The severity of proteinuria (protein loss in the urine) and hematuria (blood in the urine) also correlates with the prognosis of LN.
**Why Each Wrong Option is Incorrect**
* **Option A:** Age of onset is not a significant prognostic factor in LN. While younger patients may have a more aggressive disease course, age itself is not a reliable predictor of outcome.
* **Option B:** Presence of antiphospholipid antibodies is a risk factor for thrombosis and pregnancy complications in SLE, but it is not a specific prognostic factor for LN.
* **Option C:** Serum creatinine level is a marker of renal function, but it is not a specific prognostic factor for LN. High levels of creatinine indicate impaired renal function, but do not provide information on the underlying pathology of LN.
**Clinical Pearl / High-Yield Fact**
Patients with LN and high levels of proteinuria (>3.5 g/24 hours) are at increased risk of developing chronic kidney disease and end-stage renal disease.
**Correct Answer: C.**