- All female or male subjects who are biologically capable of having children must agree to abstinence or commit to the use of a reliable method of birth control during for the duration of the study and for 30 days after early discontinuation. 4. Hemoglobin levels >=12.0 and <=16.5 g/dL for female subjects and >=13.0 and <=18.5 g/dL for male subjects.