Low TSH, high FT4 (primary hyperthyroid)
Common causes
- • Graves
- • Toxic nodule
- • Thyroiditis
- • Amiodarone
Significance: Confirm with TRAb / uptake scan.
Differential diagnosis
- • Graves
- • Toxic MNG
- • Subacute thyroiditis
Next investigations
- • TRAb
- • Uptake scan
- • USG thyroid
Red flags
- • Thyroid storm: fever, tachy, AF, agitation
