If your child is early or late, your doctor might run blood tests to check on hormone and thyroid levels or X-ray the wrist to see if bone growth is normal. If those tests don’t turn up any clues, your doctor may suggest further testing, which may include chromosome testing or possibly a CT or MRI scan of the head to rule out a tumor. Other imaging testing may be needed to evaluate the ovaries and testes.
If your child has late puberty, your doctor may suggest seeing a pediatric endocrinologist who specializes in growth and hormonal disorders for further evaluation. But most of the time, no cause is found and no treatment is needed. From The Smart Parent's Guide: Getting Your Kids Through Checkups, Illnesses, and Accidents by Jennifer Trachtenberg.
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