- Hemoglobin ≤ 8.5% for diabetic patients (whether on medication and/or controlled with diet) Thyroid Stimulating Hormone (TSH), T3 & T4 within normal limits Negative serum antibody to hepatitis C Negative antibody to human immunodeficiency virus (anti-HIV) ELISA method If the patient has a history of diabetes or hypertension, a baseline ocular examination will be required.