Alpha thalassemia minor and carrier states cannot be determined by hemoglobin levels, as they will both test at normal levels. At most, there might be a slight measurable anemia in alpha minor.
In beta minor, Hb level is usually in the 9-11 range. This is higher in silent carrier (minima) beta thal and is likely in the normal range. HbA2 is 3.5 -8%. HbF is 1-5% in about 50% of minors. MCV will be in the 50-70 range. Minima is a classification that isn't the result of measurement, but is based on lack of symptoms.