I have a haemoglobin of 6 is that normal?

i am 73 and have had a transfusion 2 weeks ago now it is down to 6 is that normalI have a haemoglobin of 6 is that normal?
Hemoglobin is a protein contained in red blood cells that carries oxygen to, and carbon dioxide away from, the body's cells. A hemoglobin test is typically ordered as part of a complete blood cell (CBC) count.
Hemoglobin is measured in grams per deciliter of blood. The normal levels are: Men: 13.8 to 17.2 gm/dl
Low levels of hemoglobin may be a result of:
Anemia.
Erythropoetin deficiency.
RBC destruction.
Hemorrhaging (bleeding).
Lead poisoning.
Malnutrition.
Iron, folate, vitamin B12 or vitamin B6 deficiency.
Overhydration.
have u any disease, u have svere anaemia according to haeglobin