A technetium‑99m thyroid scan is a nuclear medicine test that uses a small radioactive tracer to map thyroid function. After injection, a gamma camera images tracer uptake to identify overactive (“hot”) or underactive (“cold”) areas, evaluate nodules, goitre, or hyperthyroidism, and guide treatment. It’s quick, minimally invasive, involves low radiation, and is avoided in pregnancy and breastfeeding.

A pertechnetate thyroid scan is a nuclear medicine test that uses technetium‑99m pertechnetate injected intravenously and imaged with a gamma camera to assess thyroid size, shape and function. The tracer is taken up by thyroid cells (but not organified), producing images that identify overactive (“hot”) or underactive (“cold”) areas, detect nodules or ectopic tissue, and guide diagnosis and treatment.

Costs vary widely by country and facility. In India a Tc‑99m thyroid scan typically costs about ₹800–₹3,500. In the UK it’s usually free on the NHS; private clinics charge roughly £150–£400. In the US ranges commonly run from about $200 to $1,200 or more depending on insurance, hospital vs outpatient center, and whether reporting and follow‑up are included. Ask your provider for a quote.

A Tc (technetium-99m) thyroid scan is a nuclear medicine imaging test that uses a small injected dose of technetium to visualize thyroid size, shape and function. It shows areas of increased or decreased tracer uptake (hot or cold nodules), helps evaluate hyperthyroidism and nodules, and guides management. It’s quick, outpatient, and generally avoided in pregnancy and breastfeeding.

A thyroid nuclear scan is generally safe. Side effects are uncommon and usually mild: minor pain, swelling or bruising at the injection site; a brief metallic taste, nausea, dizziness, or headache; and very rarely an allergic reaction. Radiation exposure is low but pregnant or breastfeeding people should avoid or take precautions. Serious complications are extremely rare.

Thyroid ultrasound is the first-line imaging for most thyroid problems; it best evaluates size, nodules, cysts and guides biopsy. Radionuclide thyroid scans using I‑123 or Tc‑99m are best for assessing function, distinguishing hot from cold nodules and diagnosing hyperthyroidism. CT or MRI are reserved for large substernal goiters or cancer staging when anatomy beyond ultrasound is needed.