What tests are routinely done for precocious puberty? Parents, do you know? 1.Bone age: Take orthopantomograph of non-dominant hand (including wrist bone and lower end of radius and ulna), and have the radiology specialist measure the bone age according to GP atlas method or TW2 method. Bone age more than 1 year above the physiological age can be considered as advance. 2.Ultrasound examination of the uterus and ovaries: The child’s bladder is moderately filled, and 2D ultrasound is applied to measure the long, anterior and posterior diameters of the uterus; the long, anterior and posterior diameters and transverse diameters of the ovaries; the maximum diameter and number of follicles are measured, and the uterine volume and ovarian volume are calculated using the formula. 3.Magnetic resonance imaging (MRI): At present, boys with precocious puberty and girls with precocious puberty under 6 years of age should undergo MRI of the pterygoid saddle area of the skull and related central nervous system to determine whether there are intracranial organic lesions and occupational lesions. 4. Gonadal axis hormones: follicle-stimulating hormone, luteinizing hormone, estradiol and testosterone. Chorionic gonadotropin should be measured in boys to see if there are HCG-secreting tumors.