Thyroid Testing lab tests in Grassroots Labs Lab Test Test Cost Thyroid Panel - Thyroid Blood Test $44.44 Thyroid Cascading Reflex $12.22 TPO - Thyroid Peroxidase Antibodies - TPO Test $27.78 TSI - Thyroid Stimulating Immunoglobulin - Thyroid Stimulating Immunoglobulin Test $181.00 TSH with Reflex to T-4 Free - TSH with Reflex to FT4 $13.33 Thyroid Peroxidase and Thyroglobulin Antibodies $51.11 TSH - Thyroid Stimulating Hormone - TSH Test $13.33