When tests have ruled out kidney or liver problems, where do you look next in determining the reason for ammonia buildup/failure to excrete ammonia regularly? I had a catastrophic event last year and was found in a coma. I was transported to the hospital where I was in and out but mostly in for four months before my husband demanded my ammonia levels be checked. Once checked, I was found to have a 97 at the time. I’ve been treated with L-carnatine/levocarnatine 1,000mg (at first, 6x/day) now 3x/day. I’d like to know the cause and if there is anything I can do to not have to take this for the rest of my life but doctors have no idea where (or who) to send me (to) next.