3 doctors weighed in:
Can blood tests for anemia give you wrong results?
3 doctors weighed in

Dr. Ed Friedlander
Pathology
2 doctors agree
In brief: Rarely
Detecting anemia (low hemoglobin / hematocrit) is one of the simplest of all lab tests, but clerical / computer errors still happen.
If there is doubt whether you are anemic, repeat. Labs required to seek the cause (serum iron, b12, folate, (folic acid) reticulocyte count, many others) are usually reliable; taking an iron pill before the draw can mask elemental iron deficiency.

In brief: Rarely
Detecting anemia (low hemoglobin / hematocrit) is one of the simplest of all lab tests, but clerical / computer errors still happen.
If there is doubt whether you are anemic, repeat. Labs required to seek the cause (serum iron, b12, folate, (folic acid) reticulocyte count, many others) are usually reliable; taking an iron pill before the draw can mask elemental iron deficiency.
Dr. Ed Friedlander
Dr. Ed Friedlander
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1 comment
Dr. Steven Hill
Usually labs do extremely abnormal labs a second time, but if a person's symptoms do not match their lab many of us have them redrawn. Most anemia tests are quite accurate;
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Dr. Arnon Rubin
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