Hello guys, I feel like my fatigue may be related actually to some form of a mild amino acid disorder. I have alot of evidence and suspicion to back this up which I won't go into. The NHS is refusing to give me a test for the disorders I think I might have which are: PKU, Homocystinuria, Tyrosinemia Anyway I've decided to get a private test but I can only afford either a urine or a blood test. The blood test doesn't have all the amino acids I want tested so I'm wondering if I do a urine test will it be just as useful in diagonising me with an amino acid disorder??? Thanks for replies.