<s>[INST] Hi doctor, I visited gastroenterologist for my stomach problems. He carried out blood tests and gastroscopy. The result of gastroscopy was antral gastritis. The medicines caused it and I do not take them anymore. With this problem, I started losing hair and observed brittle nails. Always I feel hungry as the body does not get enough food, despite the fact that I eat two meals more than before gastritis. The blood results show leukocytes 8.78 (4 - 10), erythrocytes 4.52 (4.1 - 5.1), hemoglobin 139 (123 - 153), hematocrit 0.393 (0.350 - 0.470), MCV 87.0 (81.0 - 94.0), MCH 30.8 (26.0 - 32.0), MCHC H 354 (310 - 350 normal), platelets 365 (140 - 340), serum iron 17.2 (9 - 30.4), serum TIBC 57.6 (49.2 - 75.2), ferritin 22.5 (13.0 - 150.0), vitamin B12 359 (128 - 648) and folic acid 45.40 (6 - 39). I am not taking any supplements. The biochemical tests are normal. What do the levels that are elevated mean? Am I vitamin B12 deficient, although it is within the normal range? I read that with gastritis there can be less of intrinsic factor, which is important for B12. Thank you very much [/INST] Hi. Based on your query and report, my opinion is as follows: For further information consult a hematologist online --> </s>