Computed Tomography (CT) of the Thyroid Without Contrast
A CT scan uses X-rays to create detailed images of the thyroid without iodinated contrast. It may evaluate enlargement, nodules, calcifications, or nearby lymph nodes.
["This CT scan creates detailed images of the thyroid without using iodinated contrast."]
Key facts at a glance
- LOINC
- 36955-3
- Short code
- CT Thyroid WO contr
- Synonyms
- CT Thyroid WO contr
- Category
- liver
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- ct
- Specimen volume
- 5 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 4–24 hours
- Order
- routine
What is this test?
A thyroid CT scan is an imaging test that uses X-rays to create cross-sectional pictures of the thyroid gland and surrounding structures. In this examination, iodinated contrast dye is not used. CT is sometimes used when ultrasound cannot provide enough information or when a larger-area scan is needed.
Why might I need this test?
A clinician may order this test to evaluate an enlarged thyroid, thyroid nodules, suspicious calcifications, lymph nodes, or the extent of a thyroid or neck condition. It may also help assess structures that are difficult to examine clearly with ultrasound.
How is the test performed?
You will lie on a padded table while a CT scanner directs X-rays around your neck. The scan is usually brief, and the technologist may ask you to remain still or briefly hold your breath. Images are then reviewed by a radiologist and sent to your ordering clinician.
How do I prepare for the test?
Follow the preparation instructions provided by the imaging facility. Because contrast dye is not used, there is usually no need to stop eating or take a special drink beforehand. Tell the facility if you are pregnant, may be pregnant, or have had a serious reaction to contrast dye in the past.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Abnormal findings may include thyroid enlargement, nodules, calcifications, abnormal lymph nodes, or changes in nearby tissues. These findings do not by themselves establish whether a thyroid nodule is cancerous, so ultrasound, additional imaging, or a needle biopsy may be needed. Your clinician will interpret the scan in the context of your symptoms and other test results.
Short name
CT Thyroid
Frequently asked questions
Is this a blood test?
Why is contrast dye not used?
Can a CT scan determine if a thyroid nodule is cancer?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy