REFERRAL & SAFETY-NETTING (NO DRUG THERAPY)
Precocious Puberty - StatPearls (NCBI Bookshelf NBK544313) - https://www.ncbi.nlm.nih.gov/books/NBK544313/
The point of the referral is not the puberty; it is the brain tumour, the ovarian tumour and the congenital adrenal hyperplasia that can cause it. GnRH analogue treatment is a specialist decision and the cached article gives no primary-care amount for it, so no prescribing row is offered. What primary care owns is the age threshold, the growth chart, and telling the benign variants apart from the ones that must move quickly.
- THE AGE THRESHOLD - secondary sexual characteristics appearing before 8 years in a girl, or before 9 years in a boy. The major paediatric and endocrine societies back that cut-off, and it stays the point at which a diagnostic workup is started.
- SPEED COUNTS AS MUCH AS AGE - puberty that moves fast is abnormal even where it began at a normal age. True precocity shows several secondary sexual characteristics developing together, a fast rate of linear growth, and a bone age ahead of the child's years. The benign variants do the opposite: one isolated sign that does not progress, growth at a normal rate, and a bone age that matches the birthday.
- PLOT THE HEIGHT, EVERY TIME - a fast rate of linear growth is one of the key pointers to early puberty, so record height, weight, body mass index and the growth rate in centimetres per year accurately at every visit. A child sprinting up the centiles alongside early breast or testicular development is the one to move on.
- MOST OF IT IS BENIGN, AND THE BENIGN ONES HAVE NAMES - premature thelarche is breast tissue developing on one or both sides in a girl, either from birth to 24 months, or from 6 to 8 years - a bimodal peak - and it is the commonest of the benign variants. Nothing else pubertal comes with it, and the bone age, the growth velocity and the blood tests are all normal. Premature adrenarche is the early output of adrenal androgens: pubic or axillary hair, body odour, or acne before 8 years, with no breast development in a girl and no testicular enlargement in a boy.
- BUT DO NOT LABEL THEM AND WALK AWAY - premature thelarche needs frequent clinical follow-up so that growth and pubertal progression are watched. Premature adrenarche needs androgen exposure excluded first - creams and gels in the house, an adrenal tumour, late-onset congenital adrenal hyperplasia.
- BLEEDING IN A GIRL UNDER 8 IS A SAFEGUARDING QUESTION TOO - isolated vaginal bleeding has causes that must be excluded: sexual abuse, a foreign body in the vagina, a tumour of the genital tract, and infection of the vulva or vagina. Ask, examine appropriately, and use the child safeguarding pathway if anything does not fit.
- THE NEUROLOGICAL HISTORY THAT CHANGES EVERYTHING - ask about headaches, seizures, a head circumference that is growing, changes in vision or cognition, odd behaviour, or bouts of laughing at nothing, which can point to a hypothalamic hamartoma. Imaging follows: scanning the hypothalamic-pituitary axis by MRI is advised in central precocious puberty, and it yields most in a child under 6 years, in any child with neurological signs, and in a boy of any age. A boy with central precocity is a scan, full stop.
- ASK WHAT IS IN THE HOUSE - ask too about exposure, deliberate or accidental, to any cream, pill or supplement containing sex hormones. A parent's testosterone gel or an oestrogen cream on a shared bathroom shelf is a real and reversible cause.
- THE EXAMINATION FINDINGS THAT POINT AWAY FROM THE BRAIN - in a child of either sex with pubic hair and body odour, look for a peripheral cause where the testes are not enlarged, or where menarche has arrived with little breast development. Enlargement of one testis only can mean a testicular tumour. Look at the skin as well: cafe au lait macules, neurofibromas or bony deformity may mean type 1 neurofibromatosis, or McCune-Albright syndrome.
- THE FIRST TESTS TO SEND - the initial panel is a bone age, LH, FSH, oestrogen or testosterone, DHEA-S (dehydroepiandrosterone sulfate), 17-OH progesterone, and thyroid function. The wrist film is the cheap place to start, being non-invasive and easy, and a bone age running more than 2 standard deviations ahead of the child's actual age is what takes the workup further.
- WHY NOT TREATING HAS A COST - left untreated, the bone matures fast and the epiphyses close early, and the adult height that results is reduced; that is the main long-term worry in both sexes. Starting treatment early makes it likelier that final adult height is preserved. And there is the cost of missing the diagnosis: a serious underlying condition needing urgent medical or surgical treatment can go undetected.
- WHAT TO SAY WHILE THEY WAIT FOR THE APPOINTMENT - go through how puberty normally unfolds, and how a benign variant is told apart from an abnormal one. Cover the psychosocial side too - how the child gets on with peers, self-esteem, body image. On the treatment itself, where it is offered: complications of GnRH analogues are rare, and both short-term and long-term safety have been shown, with the hypothalamic-pituitary-gonadal axis returning to normal once therapy stops.