Scintigraphy is imaging with a gamma camera after a small amount of a radioactive tracer is injected, swallowed or inhaled. Each tracer is designed to collect in a particular organ or process, such as active bone, thyroid tissue or working kidney cells. SPECT is the three-dimensional version, often fused with a low-dose CT.
Unlike CT or MRI, which show structure, scintigraphy shows function: how active a tissue is and how well an organ works. Its images are less sharp, so a positive finding often needs a second test to explain it.
What Scintigraphy (Nuclear Medicine Scans) shows
A bone scan highlights areas of increased bone turnover, revealing metastases, stress fractures, infection or loosening of a joint replacement across the whole skeleton in one examination. A thyroid scan shows whether nodules are overactive ('hot') or inactive ('cold') and the pattern of an overactive gland. Renal scans measure the share of work done by each kidney (DMSA) and how well each drains (MAG3). Sestamibi scans locate an overactive parathyroid gland before surgery. Lung ventilation-perfusion scans detect pulmonary embolism, HIDA scans test gallbladder emptying, and sentinel node mapping guides breast cancer and melanoma surgery.
When Scintigraphy (Nuclear Medicine Scans) is recommended
- Staging or follow-up of cancers that spread to bone, such as prostate and breast cancer
- Unexplained bone pain with normal X-rays, or suspected stress fracture or bone infection
- Thyroid nodules with a low TSH, or overactive thyroid of unclear cause
- Children and adults with kidney scarring, reflux or suspected PUJ obstruction
- Raised calcium and parathyroid hormone before parathyroid surgery
- Suspected pulmonary embolism when CT contrast cannot be given
Limits and situations where another test is better:
- Pregnancy, unless the result is essential and no alternative exists
- Detailed anatomy of joints, discs or soft tissues, where MRI is superior
- Myeloma and some purely destructive bone lesions, which bone scans can miss
- Most cancer staging where PET-CT is available and gives more information
How to prepare
- Tell the team if you are or could be pregnant, or are breastfeeding
- Most scans need no fasting; HIDA scans need 4 to 6 hours without food
- For thyroid scans you may need to stop thyroid tablets or avoid iodine contrast and supplements for some weeks
- Drink plenty and empty your bladder often after a bone or kidney tracer
- Bring previous imaging and a medicine list
What happens during the test
A tracer is injected into an arm vein. Timing then depends on the scan: thyroid and kidney images start within minutes, while for a bone scan you return 2 to 4 hours later. You lie still on a couch while the camera moves slowly close to your body for 20 to 45 minutes. It is quiet and open, unlike an MRI tunnel. You feel nothing from the tracer.
Results and next steps
A nuclear medicine physician reports the images, usually within 1 to 2 working days. Hot spots are compared with your X-rays, CT or MRI, and a targeted scan or biopsy may be recommended if a finding is uncertain. Results go to the referring doctor, who decides on treatment.
- Test time: 1 to 5 hours depending on the scan
- Results ready: 1 to 2 working days
- Back to everyday activity: None
Safety and risks
- Radiation exposure, roughly comparable to a CT of one body region for most scans
- Allergic reaction to the tracer, which is very rare
- Bruising at the injection site
- Need to limit close contact with infants and pregnant women for the rest of the day
Arranging Scintigraphy (Nuclear Medicine Scans) in Türkiye
Scintigraphy is not a reason to travel by itself. It is usually done within a wider work-up in Istanbul: before parathyroid or thyroid surgery, in cancer staging, or when assessing kidney drainage before pyeloplasty. Same-day or next-day reporting fits easily into a short visit.
Send your previous reports and the question you want answered and a Clinic-Y coordinator replies within 24 hours with suitable teams and written, all-inclusive proposals side by side. Reviewing your case is free.
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Is the radiation dangerous?
Doses are low and the tracer decays within hours to a day. The benefit of an accurate diagnosis outweighs the small theoretical risk for nearly everyone except in pregnancy.
What is the difference between scintigraphy, SPECT and PET?
Scintigraphy gives flat images, SPECT gives 3D images from the same tracers, and PET uses different, shorter-lived tracers with higher resolution, mostly for cancer.
Can I fly the same day?
Yes, but airport radiation detectors may be triggered for a day or two. Ask for a letter.