If both people have MCV<80 or MCH<27 in their blood test, people with suspected thalassemia minor are then tested for hemoglobin A2 by HPLC. If both have HbA2>3.5. If both people have HbA2encoded_tag_closed3.5. The carrier is a healthy (minor) carrier and needs specialist advice. If HbA2<3.5 in either person or both, the person is treated as iron deficient.
Iron deficiency is treated for a month and then tested again. If the problem is solved, marriage is unrestricted.