GH deficient children receiving GH replacement do not grow during intermittent infectious illness.

Five growth hormone deficient children, aged 5.3 to 12.6 yrs, were measured regularly once or twice weekly by knemometry, a novel and noninvasive technique of accurate lower leg length measurement. The total period of observation was 40 months in the 5 children. During this time all children received replacement therapy with extractive human pituitary growth hormone 12 IU/m2/week by daily s.c. injections. 11 intermittent infectious illnesses occurred within the observation period of 40 months. During the infectious diseases a significant decrease of the mean lower leg growth velocity down to -0.012 mm/day was observed. During the following convalescent period (14 days) mean lower leg growth velocity rose up to +0.107 mm/day (p less than 0.001). Growth hormone substitution was not changed throughout the period of observation.