Cheryl, Volunteer Mentor | @cehunt57

Thyroid disease vs Parathyroid (PTH) Disorders
I am sorry if my comment about supplements / vitamins affecting testing of thyroid levels (TSH, T3 and T4) caused any confusion. My experience is with Hashimoto's thyroiditis (hypothyroidism). Parathyroid Disorders is different than Thyroid disease and involves different testing.

Not sure if when diagnosing PTH they also test thyroid hormones. There have been some studies that show patients with PTH have a high prevalence of thyroid disease, especially in postmenopausal women.

Did some reading up on topic and this article from George Washington Univ explains the difference thyroid / parathyroid diseases.
https://www.gwhospital.com/conditions-services/ears-nose-throat/thyroid-parathyroid-disorders
Laurie