If children who are diagnosed as idiopathic isolated growth hormone deficiency are retested for growth secretion after adult height has been reached, a normal test result is often observed. It appears plausible that if a normal GH secretion is observed in mid-puberty, GH treatment may only have a minor effect on adult height. We hypothesize that withdrawing GH treatment in mid-puberty has no negative effect on attained adult height and on patients' satisfaction with adult height.