The most common presentation of IgA nephropathy
**Core Concept**
IgA nephropathy, also known as Berger's disease, is a kidney disease characterized by the deposition of IgA antibodies in the glomeruli, leading to inflammation and damage. The disease often presents with hematuria, which is the presence of blood in the urine.
**Why the Correct Answer is Right**
The most common presentation of IgA nephropathy is episodic hematuria, typically following an upper respiratory tract infection or gastrointestinal infection. This is due to the activation of the immune system, leading to the production of IgA antibodies that are deposited in the glomeruli. The subsequent inflammation and damage to the glomeruli cause the release of blood into the urine.
**Why Each Wrong Option is Incorrect**
* **Option A:** Acute kidney injury is not a typical presentation of IgA nephropathy, although it may occur in severe cases.
* **Option B:** Proteinuria is not a common feature of IgA nephropathy, although some patients may have mild proteinuria.
* **Option C:** Nephrotic syndrome is not a typical presentation of IgA nephropathy, which is characterized by minimal proteinuria and no significant edema.
**Clinical Pearl / High-Yield Fact**
IgA nephropathy often presents with hematuria following an upper respiratory tract infection, making it essential to consider this diagnosis in patients with recurrent episodes of hematuria.
**Correct Answer:** C. Nephritic syndrome