Am i eligible to donate blood? what should i do?

Go to blood bank: At the blood donation center they will screen your eligibility. In my experience, the most frequent reason to be vigilant is iron deficiency -- from frequent blood donation and/or in women coupled with heavy menses or recent childbirth. Oral iron supplements are an easy way to correct this but be sure you know why the iron was low- bleeding from ulcers or polyps or cancers needs exclusion.