Hormonal changes throughout puberty in boys:an observational study on the treatment outcome of congenital hypogonadotropic hypogonadism

To the Editor:It is difficult to capture the exact time of initiation of puberty in normal children,such as when breasts in girls and testicles in boys begin to grow,especially in boys.As a result,research on the detailed patterns of physical development during puberty and the cut-off values and changes of hormones at the initiation of puberty and developmental maturation is rare.It is generally believed that hormonal changes during puberty are a direct result of the stimulating effect of luteinizing hormone(LH)on initiation of puberty;[1]thus,LH is widely accepted as an indicator to evaluate initiation of puberty.However,researchers have not yet reached an agreement on the cut-off value of LH,especially in boys.