Get an X-ray of the wrist, hand, knee, or other relevant area
Have a doctor compare the X-ray to bone age standards
Look for fused growth plates on imaging
Check for a visible growth plate line; if it is absent or fully fused, the plates are closed
Ask a pediatric endocrinologist or orthopedic doctor to interpret the results
Consider MRI or CT only if a doctor recommends it
Notice that lack of recent height increase may suggest closure, but it does not confirm it
Understand that pain, puberty stage, or exercise cannot reliably tell if growth plates are closed
Use medical imaging as the only reliable way to confirm closure