The cost of the Thyroid Pentathlon is about$250 at a tertiary care hospital. There will be a difference in pricing depending on the level of the hospital, the level of testing, and the equipment, but the overall difference is not significant. The Pentathlon includes free T3, free T4, combined T3, combined T4, and thyroid stimulating hormone. It costs about 50 bucks for each item, and about 250 bucks for the total. If you also want to measure thyroid antibodies, such as thyroglobulin antibodies and thyroid peroxidase antibodies, the cost of these two antibodies is about 150 dollars.