**Question:** All are diagnostic criteria for 'severe acute malnutrition' (SAM) except?

A. Edema of the face or both lower limbs
B. Weight for age <-7 standard deviations C. Weight for length <-8 standard deviations D. Serum albumin <2.5 g/dL **Correct Answer:** D. Serum albumin <2.5 g/dL **Core Concept:** Severe acute malnutrition (SAM) is a clinical condition characterized by severe wasting of body tissues resulting from inadequate nutrition. In the context of the question, the diagnostic criteria for SAM are features that can be used to identify and diagnose the condition. These criteria are usually based on anthropometric measurements and clinical signs. **Why the Correct Answer is Right:** The correct answer, serum albumin <2.5 g/dL, is not a direct diagnostic criterion for severe acute malnutrition. Albumin is a protein involved in maintaining osmotic pressure, shock resistance, and acting as a transport protein for fatty acids and other substances. A low serum albumin level is a marker of overall poor nutritional status, but it is not specific to severe acute malnutrition. The diagnostic criteria for SAM focus on direct measures of body composition (e.g., weight, length, or mid-upper arm circumference) and clinical signs (e.g., oedema, severe dehydration, etc.). **Why Each Wrong Option is Incorrect:** A. Edema of the face or both lower limbs (OA) B. Weight for age <-7 standard deviations (OA) C. Weight for length <-8 standard deviations (OA) These options are incorrect because they are specific to severe acute malnutrition (SAM) and provide a direct measure of body composition, which is essential in diagnosing severe acute malnutrition. Oedema (edema) is a key clinical sign of SAM, and a weight-for-age <-7 standard deviations or weight-for-length <-8 standard deviations are anthropometric measurements indicative of severe malnutrition. These options are therefore more relevant to the diagnosis of severe acute malnutrition (SAM) rather than being incorrect. **Why the Correct Answer is Right:** D. Serum albumin <2.5 g/dL (OA) A low serum albumin level is a marker of poor nutritional status, reflecting inadequate protein intake and liver dysfunction. However, as explained earlier, it is not specific to severe acute malnutrition (SAM) and may be influenced by other factors like liver disease or inflammation. **Why Each Wrong Option is Incorrect:** A. Edema of the face or both lower limbs (OA) B. Weight for age <-7 standard deviations (OA) C. Weight for length <-8 standard deviations (OA) These options are specific to severe acute malnutrition (SAM) and are direct measures of body composition. Edema, weight loss, and length loss are key clinical signs and anthropometric measurements indicative of severe acute malnutrition. D. Serum albumin <2.5 g/dL (OA) While a low serum albumin level indicates poor nutritional