Dear friend, though nutritional anemia (decreased hemoglobin count) is common in developing countries like India, count less than 7% definitely has a serious sometimes life threatening condition underlying that. Multiple causes can also be expected with such low counts in which one is nutritional.
Acute blood loss due to heavy accident followed by nutritional deficiency can result in such hemoglobin count. Worm infestation can be one more reason.
Most important thing one should not miss are hemobglobinopathies (abnormal structure of hemoglobin) that cause the death of RBC easily like sickle cell Hb or Thallesemia, but the thing is they are congenital and present in early child hood.
If the problem is of recent origin, then it might be due to infection like viral (Parvo virus,liver-hepatitis virus). This is called aplastic anemia. Other characters of this anemia are decreased in other blood cells also called pancytopenia. Aplastic anemia may also be caused by auto-immunity, drugs like cholramphenical, phenytoin, radiation hazards. So any occupational exposure of radiation is to be checked with him.
There are basically three reasons for the decreased hemobglobin, one decreased production of RBC, decreased amount of Hb per RBC (nutritional), and increased killing of RBC.
Please get the following tests done and get back.
CBP (complete blood picture: to see other blood cells)
LFT (live function test)
TIBC (total Iron binding capacity)
Optional: Serum B12, Folic acid.
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