welcome to health care magicPernicious anemia
means deficiency of either folic acid
or vit.B 12..
After correcting the levels of these by medications levels revert to normal..
1st of all you should find out the cause for pernicious anemia,,,either due to less dietary intake,,or any worm infestations in the body,improper absorption of vitamins
in the body,,or may be due to autoantibodies directed against intrinsic factor(important factor in the absorption of vitB 12),,
By finding the cause the treatment becomes easier..
Consult hemotologist fo further tests,suggestions and finally treatment..
Hope you understand my suggestion and answer