| AIT 1 | AIT 2 | |
| T3, T4 | Elevated | Initially Elevated |
| Underlying Defect | Multinodular Goiter, Latent Grave's | Destructive Thyroiditis |
| Iodine Uptake | Normal or High | Low |
| Prevalance in USA | Minority | Majority |
| Prevalence in Iodine deficient regions | Majority | Minority |
| Thyroglobulin | Higher | Lower |
| Doppler Sonography | Increased vascularity | Decreased vascularity |