Anthropometric parameters assessment in pediatrics
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Anthropometric assessment in pediatrics
Anthropometry is the measurement of body size and proportions to assess a child’s growth, nutritional status, and body composition. It is inexpensive, noninvasive, and most useful when measurements are plotted serially on an age- and sex-appropriate growth chart rather than interpreted as a single value.
Objectives
- Monitor normal growth and growth velocity
- Identify undernutrition, overweight, obesity, and growth faltering
- Screen for chronic disease, endocrine disorders, genetic syndromes, and microcephaly/macrocephaly
- Assess response to nutritional or medical treatment
Measurements and technique
| Parameter | Method | Main clinical use |
|---|---|---|
| Weight | Infants: nude or dry diaper on infant scale. Older children: calibrated standing scale, minimal clothing, no shoes. | General growth; weight-for-age; weight-for-length/height; BMI |
| Recumbent length | Birth to <2 years, or if unable to stand. Use an infantometer with two trained observers; head against fixed board and legs gently extended. | Length-for-age; weight-for-length |
| Standing height | Usually ≥2 years. Use a wall-mounted stadiometer; no shoes, heels together, legs straight, buttocks and upper back aligned where possible, head in Frankfurt plane. | Height-for-age; BMI |
| Head circumference (HC/OFC) | Use a nonstretchable tape around the maximum occipitofrontal circumference: above eyebrows/supraorbital ridges and over most prominent occiput. Record the largest of 2-3 readings. | Brain growth, microcephaly, macrocephaly, hydrocephalus |
| Mid-upper arm circumference (MUAC) | Left arm relaxed; locate midpoint between acromion and olecranon, then apply tape snugly without compression. | Rapid screening for acute malnutrition, especially age 6-59 months |
| Skinfold thickness | Usually triceps, sometimes subscapular; use calibrated calipers. | Estimates subcutaneous fat stores, less commonly used routinely |
| BMI | Weight (kg) / height (m²) | Assessment of thinness, overweight, and obesity in children ≥2 years |
| Waist circumference / waist-height ratio | Standardized abdominal measurement. | Central adiposity and cardiometabolic risk, mainly older children/adolescents |
Important: Record exact age, sex, gestational age at birth, and pubertal stage where relevant. Correct age for prematurity when interpreting growth in infants and young children, according to local protocol.
Growth indices and interpretation
| Index | Formula / comparison | Indicates |
|---|---|---|
| Weight-for-age (WFA) | Weight compared with children of same age and sex | Underweight, but cannot distinguish stunting from wasting |
| Length/height-for-age (L/ HFA) | Length or height compared with age and sex | Stunting or chronic growth restriction |
| Weight-for-length/height (WFL/WFH) | Weight relative to length or height | Wasting or acute malnutrition |
| BMI-for-age | BMI relative to age and sex | Thinness, overweight, obesity |
| Head-circumference-for-age | HC relative to age and sex | Abnormal head or brain growth |
| MUAC-for-age | Arm circumference relative to age or program cutoff | Acute malnutrition / reduced muscle and fat mass |
| Growth velocity | Change in weight, length/height, or HC over time | Early detection of faltering before severe deficit occurs |
The three standard nutritional indices are WFA, HFA, and WFH. They classify underweight, stunting, and wasting, respectively. Park's Textbook of Preventive and Social Medicine, p. 633 and section “Measurement of Undernutrition.”
Z-score
[
Z\ score = \frac{\text{Observed value - median reference value}}{\text{SD of reference population}}
]
For WHO growth standards in children under 5 years:
| Z-score | Interpretation |
|---|---|
| < -3 SD | Severe undernutrition: severe wasting, severe stunting, or severe underweight |
| -3 to < -2 SD | Wasting, stunting, or underweight |
| -2 to +2 SD | Generally within expected range |
| > +2 SD | High weight-for-length/height or BMI, possible overweight depending on index |
| > +3 SD | Obesity for relevant weight-related indices |
For severe acute malnutrition, important criteria include weight-for-height/length below -3 SD, MUAC <115 mm in children 6-59 months, or bilateral pitting nutritional edema. Park's Textbook of Preventive and Social Medicine, section “Severe Acute Malnutrition.”
Growth charts
Use the appropriate sex-specific chart and plot each measurement at every visit.
- WHO standards: commonly used from birth to 5 years and include length/height-for-age, weight-for-age, weight-for-length/height, BMI-for-age, head circumference, MUAC, and skinfold measures. The WHO growth standards provide charts up to 60 completed months.
- In the United States, the CDC and AAP recommend WHO charts from birth to 2 years, then CDC charts from age 2 years onward. See the CDC chart guidance.
A single measurement indicates current size only. Serial plotting and velocity are more informative: falling percentiles or crossing downward through major centile/z-score lines suggests growth faltering. Repeated weight measurement is emphasized because it detects whether weight is rising, stationary, or declining. Park's Textbook of Preventive and Social Medicine, p. 633.
Head circumference assessment
- Measure at every routine visit in infancy, then when clinically indicated.
- Plot against age and sex.
- Evaluate:
- Microcephaly: HC < -2 SD, severe if < -3 SD
- Macrocephaly: HC > +2 SD
- Rapid upward or downward crossing of centiles is more concerning than a stable measurement at an extreme centile.
- Interpret alongside parental head size, developmental history, neurological examination, and weight/length pattern.
Interpretation of common patterns
| Pattern | Likely significance |
|---|---|
| Low WFA only | Underweight. Could result from wasting, stunting, or both |
| Low HFA with relatively preserved WFH | Chronic undernutrition, chronic disease, endocrine or genetic cause |
| Low WFH or low BMI-for-age | Acute undernutrition or recent weight loss |
| Weight declines before height | Often early nutritional deficiency or systemic illness |
| Simultaneously low weight, height, and HC | Consider longstanding severe deprivation, chronic systemic disease, congenital infection, genetic or neurologic condition |
| High BMI-for-age or high WFH | Overweight/obesity risk, but assess body habitus, pubertal status, diet, activity, and comorbidities |
| Low MUAC | Reduced muscle/fat stores and acute malnutrition risk |
| Weight rises disproportionately relative to height | Excess adiposity, endocrine causes are less common unless height velocity is reduced |
In a single assessment of pediatric malnutrition, useful primary indicators include WFH z-score, BMI-for-age z-score, HFA z-score, MUAC/wasting, and nutritional edema. With serial data, weight-gain velocity and decline in WFH z-score are particularly informative. The Harriet Lane Handbook, 23rd ed., p. 759.
Precautions and common errors
- Use calibrated equipment and standard technique.
- Measure length, not standing height, in young infants. Length is typically about 0.7 cm greater than standing height.
- Plot measurements using the correct age and sex.
- Do not diagnose malnutrition from weight-for-age alone.
- Confirm unexpected values by repeating the measurement.
- Account for edema, which can falsely elevate body weight.
- Interpret growth with birth history, feeding history, infections, chronic disease, developmental status, family stature, and pubertal timing.
- A stable low centile in a healthy child with normal velocity and short parents may be familial short stature, not pathology.
Short clinical assessment format
- Confirm age, sex, gestation, and measurement accuracy.
- Measure weight, length/height, and HC in infants; add BMI in children ≥2 years.
- Use MUAC where acute malnutrition is suspected.
- Plot on an appropriate chart and calculate/obtain z-scores.
- Review serial trend and growth velocity.
- Classify as normal growth, underweight, stunting, wasting, overweight/obesity, or abnormal head growth.
- Investigate abnormal patterns with dietary, medical, developmental, family, and social history.
Each parameter in detail
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