Haemoglobin levels
The minimum Hb levels needed to give blood are:
12.5 g/dl in women
13.5 g/dl in men
Haemoglobin (Hb) is a protein that contains iron and is found in red blood cells. It carries oxygen around the body and gives blood its red colour. Your Hb will be tested before you give blood using a test that measures the levels of Hb in the small blood vessels of your finger.