CT Scan
Imaging · Imaging
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About this test
What is a CT Scan?
A CT (computed tomography) scan is a non‑invasive imaging test that uses X‑ray beams and computer processing to create detailed cross‑sectional images of the body. It helps doctors see organs, bones, blood vessels, and tissues in great detail.
Key parameters reported
| Structure | What it shows |
|---|---|
| Bones | Fractures, bone density, tumors |
| Soft tissues | Masses, inflammation, organ size |
| Blood vessels | Blockages, aneurysms, blood flow |
| Organs | Shape, lesions, organ function |
Why this test is done
- To investigate pain or swelling in a specific area
- To evaluate suspected tumors, infections, or injuries
- To guide biopsies or surgical planning
- To monitor treatment response in cancer or other chronic conditions
Early detection
A CT scan can help identify signs of conditions such as tumors, aneurysms, or organ damage, but it does not diagnose on its own. A doctor interprets the images together with symptoms, history, and other tests.
What abnormal results may indicate
- High density areas may suggest calcification, tumors, or hemorrhage
- Low density areas may indicate cysts, edema, or fatty infiltration Many factors—hydration, recent meals, medications—can affect image appearance, so results are considered in context.
Who might be advised to get a CT scan
- Patients with unexplained abdominal, chest, or head pain
- Individuals with a history of cancer or suspected recurrence
- Those undergoing evaluation for stroke, aneurysm, or traumatic injury
Quick summary
A CT scan provides detailed images of body structures, aiding in diagnosis and treatment planning. It is a valuable tool but must be interpreted by a clinician alongside other information.
Used for detecting / monitoring
Before your test
Preparation for a CT Scan
- Fasting: No fasting is required for a standard CT scan. If you are having a contrast‑enhanced scan, your doctor may advise you to avoid large meals for 2–4 hours before the test.
- Combined tests: If you are also scheduled for a blood test that requires fasting, follow the fasting instructions for the blood test.
- Procedure: You will lie on a motorised table that slides into the CT scanner. The scan usually takes 5–15 minutes. You may be asked to hold your breath briefly during image acquisition.
- Discomfort: The procedure is painless. You may feel a slight pressure when the table moves. If a contrast agent is used, you may feel a warm sensation when it is injected.
- Precautions: Inform the technologist of any metal implants, pacemakers, or allergies to iodine‑based contrast. Avoid alcohol 24 h before the scan if contrast is used.
- After the scan: You can resume normal activities immediately unless you received contrast; in that case, drink plenty of fluids.
Please confirm the specific preparation instructions with your doctor or the lab. This information is for general educational purposes only and does not replace professional medical advice.
Sample type: Imaging
Report parameter guide
CT Scan
Imaging test that uses X-rays to create detailed cross‑sectional images of the body