I had my blood drawn today for my amino acid /pku. what would be the reason my blood look brown color and not red?

Need more info: Was it brown or purple. Venous blood has a deeper color, normally. If you are not short of breath, it would not be a cause for concern. Have a healthy diet, exercise 30 minutes/day, drink plenty of water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs. For nutrition: http://www.choosemyplate.gov/. Get Covid vaccine. Wish you good health!