Hi all I have been following the CBS protocol for several months and although I don't have sulfa strips I feel, better thanks to the vitamins and a low thiol diet.I have even been tolerating TMG @ a gram a day for a week now with no issues. But I need to get my ammonia and homocysteine levels checked... but how should I get them tested, through blood/plasma or urine? By urine I mean the the urine amino acids test available at holistic heal which concludes dozens of more indicators that my be helpful in my treatment but I wonder if I should save the $300 for that test until later? Most importantly, are the levels for ammonia and homocysteine accurate in both blood and urine? Besides my 23 and me test and a full battery by my GP I havit tested for anything specific to methylation but I am following a supplementation regime for cbsa60a and bhmt 8 and assisting the suox pathway with molybdenum, etc.