A child is taken to a pediatrician because his mother notices that his eyes appear very puffy. The mother said that the boy’s eyes appeared normal two days ago, and pa of what caused her concern was that her child seemed to be rapidly becoming ill. On physical examination, the boy is noted to have generalized edema. No hypeension or jaundice is noted. Blood urea nitrogen and serum creatinine are within normal limits. A urine sample is collected, and the nurse notices that the top of the urine has a small amount of foam at the top. Urinalysis is negative for glucose, red cells, white cells, casts, crystals, and bacteria. A 24-hr-urine specimen is collected, which demonstrates proteinuria of 55 mg/h/m2. Which of the following is the most likely diagnosis?
A child is taken to a pediatrician because his mother notices that his eyes appear very puffy. The mother said that the boy’s eyes appeared normal two days ago, and pa of what caused her concern was that her child seemed to be rapidly becoming ill. On physical examination, the boy is noted to have generalized edema. No hypeension or jaundice is noted. Blood urea nitrogen and serum creatinine are within normal limits. A urine sample is collected, and the nurse notices that the top of the urine has a small amount of foam at the top. Urinalysis is negative for glucose, red cells, white cells, casts, crystals, and bacteria. A 24-hr-urine specimen is collected, which demonstrates proteinuria of 55 mg/h/m2. Which of the following is the most likely diagnosis?
💡 Explanation
**Core Concept**
Nephrotic syndrome is a clinical disorder characterized by massive proteinuria (excretion of >50 mg/kg/day), hypoalbuminemia, hyperlipidemia, and edema. It is a common cause of nephrotic range proteinuria in children, resulting from damage to the glomerular filtration barrier.
**Why the Correct Answer is Right**
The presence of significant proteinuria (55 mg/h/m2) in the 24-hr urine specimen is a hallmark of nephrotic syndrome. The lack of other abnormalities such as hypertension, jaundice, or abnormalities in blood urea nitrogen and serum creatinine levels suggests that the renal function is relatively preserved. The presence of a small amount of foam at the top of the urine sample is indicative of proteinuria. The urinalysis is negative for glucose, red cells, white cells, casts, crystals, and bacteria, which makes lower urinary tract disease and acute renal failure less likely.
**Why Each Wrong Option is Incorrect**
**Option A:** Acute renal failure is unlikely due to the lack of abnormalities in blood urea nitrogen and serum creatinine levels, and the absence of signs such as hypertension and electrolyte imbalances.
**Option B:** Chronic renal failure is unlikely in this case as the child's renal function is relatively preserved, and there are no signs of chronic kidney disease such as hypertension or electrolyte imbalances.
**Option C:** Lower urinary tract disease is unlikely due to the negative urinalysis for red cells, white cells, casts, crystals, and bacteria, and the absence of symptoms such as dysuria or urinary frequency.
**Clinical Pearl / High-Yield Fact**
Nephrotic syndrome is the most common cause of nephrotic range proteinuria in children, and it is often associated with minimal change disease, which is characterized by normal kidney histology on light microscopy.
**✓ Correct Answer: D. Nephrotic syndrome**
✓ Correct Answer: D. Nephrotic syndrome
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