Constitutional delay and familial short stature

A seven-year-old boy is brought to clinic because he is the shortest in his class. Both parents are short, his father began shaving at seventeen, and his growth chart shows him tracking just below the third centile since toddlerhood with a normal growth velocity. Down the corridor, a fourteen-year-old boy with no signs of puberty is distressed that he is still a child among his peers; his father went through puberty late, his bone age reads eleven years, and his height is appropriate for that bone age. In both rooms the task is the same: confirm that this is a normal variant of growth, exclude the pathological mimics, and decide whether anything needs to be done beyond reassurance and surveillance. The skill is not to over-investigate normal biology, nor to miss the child whose short stature or delayed puberty is the first sign of disease. ^{[1] [9]}

Overview & Definition

Short stature is defined as a height more than two standard deviations below the mean for age and sex, which places the child below the third centile on a population growth chart. It is a presenting complaint rather than a diagnosis, and the clinician's first task is to decide whether the shortness is a normal variant of growth or the sign of an underlying disorder. The two commonest normal variants are familial short stature and constitutional delay of growth and puberty, and together they account for a large proportion of the short children seen in general paediatric and endocrine practice. Recognising them is a core skill because the appropriate management is reassurance, and the principal error is either over-investigating a normal child or, conversely, labelling a pathological process as constitutional. ^{[1] [4]}

Familial short stature is the straightforward expression of a child's genetic height potential. Height is one of the most heritable of human traits — roughly eighty per cent of the variation in adult height between individuals is attributable to inherited polygenic factors, with hundreds of common gene variants each contributing a small effect. A child of short parents has inherited a low polygenic set-point, grows normally at a normal velocity, and ends up short in a way that is entirely appropriate for the family. The bone age matches the chronological age, puberty begins on schedule, and the final adult height falls within the calculated mid-parental (target) height range. There is no disease, no deficiency, and no distortion of growth — only a normal child at the short end of the normal range. ^{[2] [4]}

Constitutional delay of growth and puberty is a variant of tempo rather than of set-point. The child has a slowed biological clock: the hypothalamic-pituitary-gonadal axis, dormant since infancy, reactivates late, so puberty begins later than in peers and the pubertal growth spurt is delayed. The bone age lags behind the chronological age and typically matches the height age, which is why the child is short for chronological age but on track for bone age. The characteristic feature is a late but prolonged growth spurt that carries the child to a final adult height within the normal range and, crucially, within the family target range. Constitutional delay is common in boys — who present far more often than girls, largely because the psychosocial impact of delayed puberty is more pronounced in adolescent males — and there is usually a family history of late puberty in a parent or first-degree relative. ^{[9] [11]}

References11ShowHide

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