12.1 Nutrition-Focused Physical Exam

The Role of the Nutrition-Focused Physical Exam in Pediatric Assessment

The nutrition-focused physical exam (NFPE) is the hands-on component of nutrition assessment in which the registered dietitian nutritionist (RDN) systematically inspects the body for signs of nutrient deficiency or excess, protein-energy malnutrition, and altered hydration. In pediatrics, NFPE does not replace anthropometry — it complements weight, length/height, and growth-chart data. A child can hold a stable weight-for-age yet show follicular hyperkeratosis or glossitis that exposes a micronutrient gap the growth curve missed; conversely, a falling BMI z-score gains clinical weight when the exam reveals temporal wasting and loss of subcutaneous fat. NFPE findings also supply the signs/symptoms portion of the nutrition diagnosis (see Section 12.5).

Adapted Techniques for Children

Pediatric NFPE differs from adult practice more in technique than in content:

• Observation-heavy: much of the exam is accomplished by watching the child undress, play, climb, and interact — general appearance, muscle bulk, fat distribution, and functional movement are assessed before the child is ever touched.
• Atraumatic and opportunistic: examine the least threatening areas first and save the mouth and ears for last; use the caregiver's lap for infants and toddlers.
• Caregiver-assisted: caregivers position and reassure the child and supply history (appetite, stool pattern, energy level) that contextualizes findings.
• Developmental lens: interpret every finding against age, since fat distribution and body proportions change normally across childhood.

Systematic Head-to-Toe Approach

Hair

Sparse, thin, easily pluckable hair with depigmentation suggests protein deficiency. The classic flag sign — alternating bands of light and dark hair corresponding to periods of poor and adequate protein intake — is associated with kwashiorkor. Dull, dry hair also accompanies essential fatty acid and zinc deficiency.

Eyes

Inspect the conjunctiva for pallor, a sign of anemia (iron, folate, or B12). Bitot spots — foamy, triangular patches on the bulbar conjunctiva — indicate vitamin A deficiency, as do night blindness and corneal xerosis. Loss of orbital (periorbital) fat is an early site of subcutaneous fat depletion in malnutrition.

Mouth and Lips

Angular stomatitis (fissuring at the corners of the lips) and cheilosis (reddened, cracked lips) are classically linked to riboflavin (vitamin B2) and iron deficiency. Glossitis — a smooth, beefy-red, sore tongue from atrophic papillae — suggests B12, folate, iron, or niacin deficiency. Bleeding, spongy gums point to vitamin C deficiency (scurvy). Patterned dental enamel defects raise suspicion for celiac disease, while mottled enamel suggests excess fluoride (fluorosis).

Skin

• Xerosis (dry, scaling skin): essential fatty acid or vitamin A deficiency.
• Follicular hyperkeratosis (rough, gooseflesh-like papules on the extensor arms and thighs): vitamin A or vitamin C deficiency.
• Petechiae, purpura, perifollicular hemorrhage: vitamin C (scurvy) or vitamin K deficiency.
• Periorificial and acral dermatitis: zinc deficiency — the rash of acrodermatitis enteropathica erupts around the mouth and anus and on the hands and feet; similar eruptions occur with essential fatty acid and biotin deficiency.
• Photosensitive dermatitis, diarrhea, dementia — the 3 Ds of pellagra (niacin deficiency).
• Delayed wound healing: protein, zinc, and vitamin C inadequacy.

Nails

Koilonychia — thin, spoon-shaped nails — is a hallmark of chronic iron deficiency. Beau lines (transverse grooves) mark a past period of severe illness or nutritional stress that temporarily halted nail growth.

Musculoskeletal

Inspect and palpate for rickets (vitamin D and/or calcium deficiency): rachitic rosary (beading at the costochondral junctions), bowing of the legs (genu varum) or knock-knees, widened wrists, frontal bossing, and delayed fontanelle closure. Assess muscle wasting at the temples (temporal hollowing), clavicles, shoulders, and the interosseous muscles of the dorsal hand, plus overall thigh and calf bulk in children. Assess subcutaneous fat loss at the orbital region and over the triceps and ribs. Muscle and fat loss are core physical criteria in pediatric malnutrition diagnostic frameworks.

Edema

Pitting edema of the lower extremities with low protein intake suggests hypoalbuminemia (kwashiorkor), but differentiate it from cardiac, renal, and hepatic causes — edema combined with flag-sign hair and flaky-paint dermatosis strongly favors nutritional edema.

Neurological

Peripheral neuropathy (numbness, paresthesias, diminished reflexes) suggests vitamin B12 or thiamine (B1) deficiency. Tetany with Chvostek and Trousseau signs indicates hypocalcemia or hypomagnesemia. Irritability and developmental regression can signal B12 deficiency in exclusively breastfed infants of deficient mothers.

Hydration Assessment

Use several signs together because each is imperfect in children. Skin turgor (checked on the abdomen or medial thigh) requires caution in infants: their high body-water content and skin elasticity make turgor unreliable, and marasmic infants lose turgor without being dehydrated. More dependable signs are mucous membrane moisture, capillary refill (prolonged beyond about 2-3 seconds is concerning), a sunken anterior fontanelle, absent tears, and — most objectively — urine output (fewer wet diapers, dark concentrated urine).

Functional Status and Growth Stigmata

Observe developmental milestones during the exam — head control, sitting, standing, gait — because malnutrition delays motor development, and motor delay in turn limits feeding skills. Hand-grip dynamometry, a standard adult functional measure, has limited pediatric use, especially before school age. Chronic undernutrition leaves physical stigmata: short stature, wasted appearance, prominent ribs, and a head that looks large relative to the body.

Physical Signs Organized by Nutrient

Documenting and Integrating Findings

Document each abnormal finding with location and severity, then integrate it with dietary intake, anthropometrics, and biochemistry before drawing conclusions — physical signs are rarely specific to a single nutrient and often appear late in deficiency. NFPE findings become the measurable signs/symptoms of the PES statement and the indicators you re-examine at follow-up visits.