A 3-year-old child from a rural area of Odisha presents with growth retardation, lethargy, and recurrent infections. On examination, the child has wasting of muscles and subcutaneous tissues, dry skin, sparse hair, and absence of edema. The liver is not enlarged. All of the following biochemical findings would be expected EXCEPT:

## Marasmus: Biochemical & Clinical Profile **Key Point:** Marasmus is protein-energy malnutrition with severe deficiency of both protein and calories. The child presents with severe wasting, absence of edema, and characteristic biochemical derangements reflecting chronic adaptation and protein catabolism. ### Clinical Presentation of Marasmus **High-Yield:** The classic triad of marasmus: 1. **Severe muscle and subcutaneous fat wasting** ("skin and bones" appearance) 2. **Absence of edema** (distinguishes from kwashiorkor) 3. **Hepatomegaly is absent** (unlike kwashiorkor) This child's presentation (wasting, no edema, no hepatomegaly) is pathognomonic for marasmus. ### Expected Biochemical Findings in Marasmus | Finding | Mechanism | Expected Value | |---------|-----------|----------------| | **Serum Albumin** | Chronic protein depletion; slow turnover (half-life 20 days) | ↓ 2.0–3.0 g/dL (reflects chronic state) | | **Hemoglobin** | Iron deficiency + chronic disease anemia + protein deficiency | ↓ 7–9 g/dL (moderate–severe anemia) | | **Serum Creatinine** | Reduced muscle mass → ↓ creatinine production | **Normal or LOW** (not elevated) | | **Blood Urea Nitrogen (BUN)** | Protein catabolism from muscle breakdown | ↑ (elevated) | | **BUN : Creatinine Ratio** | BUN ↑, Creatinine ↓ or normal | **↑ (typically > 20:1)** | | **Prealbumin** | Half-life 2–3 days; reflects acute protein status | ↓ (more sensitive than albumin) | | **Total Protein** | Reduced synthesis | ↓ 5.0–6.0 g/dL | ### Why Option 3 (Elevated BUN with Normal Creatinine Ratio) is INCORRECT **Clinical Pearl:** In marasmus: - **BUN is elevated** due to protein catabolism from muscle breakdown - **Creatinine is normal or LOW** due to severely reduced muscle mass - **Therefore, the BUN : Creatinine ratio is ELEVATED (> 20:1)**, not normal Option 3 states "elevated BUN with normal creatinine ratio," which is contradictory and incorrect. The ratio would be abnormally high, not normal. ### Marasmus vs. Kwashiorkor: Biochemical Comparison | Parameter | Marasmus | Kwashiorkor | |-----------|----------|-------------| | **Serum Albumin** | ↓ (2.0–3.0 g/dL) | ↓↓ (< 2.0 g/dL, more severe) | | **Prealbumin** | ↓↓ (severely reduced) | ↓ (moderately reduced) | | **BUN : Creatinine** | ↑ (> 20:1) | Normal or low (< 10:1) | | **Hemoglobin** | ↓ (anemia common) | ↓ (less severe) | | **Total Protein** | ↓ | ↓↓ | **Mnemonic: MARASMUS = Muscle And Reduced Albumin; Serum Creatinine Under-produced; Muscle Starvation** **Warning:** Do not confuse the BUN : Creatinine ratio in marasmus. The ratio is ELEVATED (not normal) because BUN rises while creatinine falls. [cite:Park 26e Ch 9]