Thyroid Testing lab tests in Grassroots Labs Lab Test Test Cost Thyroid Cascading Reflex $12.22 TSI - Thyroid Stimulating Immunoglobulin - Thyroid Stimulating Immunoglobulin Test $171.11 TSH - Thyroid Stimulating Hormone - TSH Test $12.22 Thyroid Panel - Thyroid Blood Test $46.67 TSH with Reflex to T-4 Free - TSH with Reflex to FT4 $12.22 TPO - Thyroid Peroxidase Antibodies - TPO Test $26.67 Thyroid Peroxidase and Thyroglobulin Antibodies $48.89