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Maternal and Child Health Bureau ~ 17

a.

crown-rump length

b.

arm span

c.

upper arm length

d.

lower leg length

Because MW is able to sit upright and extend his arms, arm span is the best answer.  Crown-rump length is more appropriate for a child who cannot extend his arms and who cannot sit upright.  Upper arm length is used for a child who is unable to extend his arms and/or sit upright.  Lower leg length is used for a child with contractures of the upper or lower body.

MW's stature was approximated using arm span. His measures were:

Arm span: 127 cm (50 in)

50-75th percentile

Weight 30 kg (64.25 lb)

75-90th percentile

Because arm span was used to approximate stature and there are no data to support the use of arm span with BMI, BMI was not calculated.

Triceps skinfold measurements, along with mid-arm circumference measurements were used to monitor MW's growth and assess his body composition.

Self-test: Child with Prader-Willi syndrome

EM is a 6 year, 10 month old girl with Prader-Willi syndrome. Her weight- and stature-for age are shown in the following CDC growth chart: (Girls 2-20 years, weight-for-age and stature-for-age)

Which of the following methods is most appropriate to assess EM's weight gain pattern?

a.

weight-for-length

b.

BMI-for-age

c.

sitting height

d.

triceps skinfold

BMI-for-age is recommended to identify risk of overweight.  Because EM is older than 3 years, the weight-for-length charts are inappropriate.  It is possible to measure EM’s stature, so an estimator of stature (e.g., sitting height) is not necessary.  Triceps skinfold may provide information about changes in EM’s body composition over time, but BMI-for-age is more useful at this time.

EM weighs 29.5 kg and is 110.5 cm tall. What is Em's BMI?

a.

26.7

b.

26.3

c.

24.2

d.

21.9

The correct response is c. 24.2.

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