All in all, good news regarding and confirming the CAC score.

I have listed the set of recommended thyroid tests to provide a full and accurate function profile:
- TSH
- Free T3
- Reverse T3
- Free T4
- Zinc RBC
- Selenium
- Iodine (urine load test)
- Thyroid antibodies

Good luck with this. As you know, a simple TSH test requires context and additional information. Hope this helps.

Certainly, the presence of the nodule may require additional investigation.