ASD/ADHD and very low lh and fsh hormone levels

Hi, 
My son has had some blood tests done re: early puberty. He is 6 years old! His results have come back and doctor referring us but didn't really say much about them only that they are abnormal. 

He was diagnosed with asd and ADHD and also has joint hypermobilty late last year. Then this had come about. Are there any kind of connections with early puberty or problems with the pururity gland and asd/ADHD 

His lh and fsh levels were very low but his sex hormone binding glob were very high? Is there anyone that would be able to help me in understanding these? 

sorry for rambling 

thanks 

kirsty