Linear Growth Velocity

1. Indications
   1. Growth Assessment
   2. Assessment for collagen bone disease
2. Efficacy
   1. Single most important Growth Assessment screening tool
3. Normal height increase
   1. Age <1 year: 10.0 inches (25 cm) growth/year
      1. Age <6 months: 16 to 17 cm growth/year
      2. Age 6-12 months: 8 cm growth/year
   2. Age 1 to 2 years: 4.0 inches (10 cm) growth/year
   3. Age 2 to 3 years: 3.2 inches (8 cm) growth/year
   4. Age 3 to 4 years: 2.8 inches (7 cm) growth/year
   5. Age 4 to 10 years: 2.0-2.4 inches (5-6 cm) growth/year
   6. Prepuberty Nadir
      1. Age 10 year old girl: 2.2 inches (5.5 cm) growth/year
      2. Age 12 year old boy: 1.9 inches (4.9 cm) growth/year
   7. Pubertal Acceleration
      1. Girls: 3.33 inches (8.5 cm) growth/year
      2. Boys: 3.75 inches (9.5 cm) growth/year
4. Interpretation: Abnormal Growth
   1. Growth/Year: <1.75 inches (4.5 cm) age 3 to Puberty
   2. Minimum time interval between assessments
      1. Age <3 years: minimum 4 month interval
      2. Age >3 years: minimum 6 month interval