A mother is demanding the right to know exactly how her teenage son died, after she was barred from a "lessons learned" review by professionals.
Lynn Cox, 42, from Bridgwater in Somerset, says she feels she was "being judged" by not being allowed to attend the Child Death Review.
Joshua Cox, 13, suffered a fatal asthma attack in October 2009, after his new GP increased his medication dose.
Somerset Primary Care Trust said it could not comment on individual cases.
But it would say that having families present at a Child Death Review could inhibit professional discussion about what lessons could be learnt.
Mrs Cox is calling for a coroner's inquest to explain why his GP increased his medication dose without apparently consulting his specialist.