Nephrotic syndrome is characterised by -a) Proteinuriab) Hyperlipidemiac) Oedemad) Haematuriae) Lipiduria
**Core Concept**
Nephrotic syndrome is a clinical disorder characterized by a specific set of symptoms and laboratory findings that indicate severe damage to the glomeruli, the filtering units of the kidneys. This condition is often associated with the loss of large amounts of protein in the urine, leading to various systemic complications.
**Why the Correct Answer is Right**
The correct answer, **proteinuria**, is a hallmark of nephrotic syndrome. This occurs due to the increased permeability of the glomerular basement membrane, allowing large molecules like albumin to pass through and be excreted in the urine. The loss of albumin leads to hypoalbuminemia, which in turn causes edema, hyperlipidemia, and other metabolic disturbances. The glomerular damage also affects the filtration of smaller molecules, including lipids, which are then reabsorbed by the proximal convoluted tubule, contributing to the hyperlipidemia seen in nephrotic syndrome.
**Why Each Wrong Option is Incorrect**
* **Option A:** While proteinuria is the correct answer, it is not the only option that could be associated with nephrotic syndrome. However, it is the most specific and sensitive marker of the condition.
* **Option B:** Hyperlipidemia is a common finding in nephrotic syndrome, but it is not a defining characteristic of the condition. It is a secondary effect of the loss of albumin and the increased reabsorption of lipids.
* **Option C:** Edema is a common symptom of nephrotic syndrome, but it is not a specific or sensitive marker of the condition. It can occur in other conditions as well, such as heart failure or liver disease.
* **Option D:** Hematuria is not typically associated with nephrotic syndrome. It is more commonly seen in conditions that affect the glomeruli, such as glomerulonephritis.
**Clinical Pearl / High-Yield Fact**
Nephrotic syndrome is often classified based on the underlying cause, with the most common being minimal change disease, which is characterized by the loss of foot processes of the podocytes.
**Correct Answer: A. Proteinuria**