Monitoring Treatment

Your veterinarian will need to monitor T4 levels in your dog periodically during the course of treatment. This requires taking a blood sample and measuring the amount of T4 in the blood. After starting thyroid hormone replacement therapy, your veterinarian will usually evaluate peak blood T4 levels every 4 weeks, 4-6 hours after treatment administration until the correct dose is determined. Once the correct dose is determined, your veterinarian will measure peak T4 levels about every 6 months.