Im not sure what these test results are saying. anion gap was 4... (norm 5-15) RBC was 4.57... (norm 4.70-6.10) ... The rest of my blood work was fine. Ive been on asacol HD (1600 mgs 3x a day) since april when I was hospitalized with a sever ulcerative Colitis flair. Ive never had the anion levels out of whack before, so I dont know much about it. I also have CFS...Anyone know what these 2 readings might be trying to tell me?