Differential Diagnostic Considerations in the Thyrotoxic Patient [Typical findings in each disease]
| Element | PFSAT | PLSAT | PPT | Graves’ |
| Neck Pain | Yes | No | No | No |
| Recent URI | Yes | No | No | No |
| Systemic symptoms | Yes | No | No | No |
| Recent Pregnancy | No | No | Yes | No |
| Thyroid symptoms | Yes | Yes | Yes | Yes |
| ESR | Elevated | Normal | Normal | Normal |
| CRP | Elevated | Normal | Normal | Normal |
| TSH | ↑/ ↓/ Nl | ↑/ ↓/ Nl | ↑/ ↓/ Nl | Suppressed |
| FT4 | ↑/ ↓/ Nl | ↑/ ↓/ Nl | ↑/ ↓/ Nl | Nl/↑ |
| TT3 | ↑/ ↓/ Nl | ↑/ ↓/ Nl | ↑/ ↓/ Nl | Nl/ ↑ |
| T3/T4 | < 20 | < 20 | < 20 | > 20 |
| Thyroglobulin | Elevated | Elevated | Elevated | Elevated |
| TPO-ab | Negative | +/−, Pos | +/−, Pos | +/−, Pos |
| Tg-ab | Negative | +/−, Pos | +/−, Pos | +/−, Pos |
| TSHR-ab | Negative | Neg | Neg | Pos |
| RAIU/Scan | Low/ Not visible | Low/ Not visible | Low/ Not visible | High/ diffuse |
| US Echo-genicity | Hypo- echoic | Hypo- echoic | Hypo- echoic | Hypo- echoic |
| Vascularity | Decreased | Decreased | Decreased | Increased |
PFSAT= painful subacute thyroiditis; PLSAT= painless subacute thyroiditis;
PPT= postpartum thyroiditis
From: Subacute Thyroiditis
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