How low your hemoglobin hematocrit to do work up for anemia?

Below normal: Anemia is a hemoglobin (HGB) or hematocrit (hct) below "normal". Normal is defined by the laboratory doing the testing and varies by laboratory and "normal" population that the lab calibrates based on. Usually <12 g/dl HGB fora woman is anemia.

In a young female: I would say under HGB 10.5 or hct 30, unless there are other issues of concern.

Find cause: I would investigate any anemia in the hope of finding a treatable cause, especially before things get serious. Iron deficiency causes fatigue before it causes anemia.