A thyroglobulin antibodies blood test measures immune proteins that can point to autoimmune thyroid disease and can interfere with thyroglobulin tumor-marker monitoring after thyroid cancer treatment.
A TPO antibodies blood test checks for immune proteins linked with autoimmune thyroid disease, especially Hashimoto thyroiditis. Learn what it measures, how to prepare, and how to read results with TSH and thyroid hormone tests.
A free T3 blood test measures unbound triiodothyronine, one form of thyroid hormone. Learn when it is useful, how to prepare, how results are interpreted with TSH and free T4, and how consumer lab options compare.
A free T4 blood test measures unbound thyroxine, a key thyroid hormone. Learn why it is ordered, how to prepare, what results can mean with TSH, and how self-pay options compare.
A TSH blood test measures thyroid-stimulating hormone, a pituitary hormone used to evaluate thyroid function, screen for possible hypothyroidism or hyperthyroidism, and monitor thyroid treatment.
The NT-proBNP blood test helps clinicians evaluate heart strain and possible heart failure in people with symptoms such as shortness of breath, swelling, fatigue, or trouble lying flat.
A BNP blood test helps evaluate whether symptoms such as shortness of breath, swelling, or fatigue may be related to heart failure. Learn how BNP works, how to prepare, and how results are interpreted.
A troponin blood test measures cardiac troponin proteins released when heart muscle is injured. Learn when it is used, how to prepare, why repeat testing matters, and what high or normal results may mean.
A homocysteine blood test measures an amino acid linked to vitamin B12, folate, vitamin B6 metabolism, and selected cardiovascular or genetic evaluations. Learn when it is ordered, how to prepare, and how to interpret results.
The hs-CRP blood test measures very low levels of C-reactive protein, an inflammation marker often used with cholesterol, blood pressure, smoking status, diabetes risk, and family history to discuss cardiovascular risk.
