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In testing for megaloblastic anemias of any sort, serum or red blood-cell folate levels are usually also obtained.
The blood test for levels of vitamin B-12 has become much more accurate within the past few years. Now, there are fewer false-normal results, because only biologically active B-12 is measured.
The cause of a vitamin B-12 deficiency is usually determined by the Schilling test.
Hemolysis of the blood sample (rupture of some of the red blood cells) may affect test results.
Veins and arteries vary in size from one patient to another and from one side of the body to the other. Obtaining a blood sample from some people may be more difficult than from others.
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