Finding the right tests…
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Finding the right tests…
CT Scan
CT HEAD PLAIN is a non-contrast scan of your brain and skull, meaning no dye is injected at any point. Doctors often choose this version first when time matters, such as after a head injury or a sudden, severe headache, because fresh blood inside the skull shows up clearly on plain images without waiting for contrast. Because no iodine-based dye is used, there's no need to check kidney function beforehand or screen for a contrast allergy. The scan takes cross-sectional images while you lie still, and a radiologist reviews them for bleeding, fracture, swelling, or a mass. If those images raise a question contrast can't answer, your doctor may add a contrast-enhanced scan afterward.
There's no lab value here. A radiologist looks at the images for bleeding, fracture, brain swelling, or a mass, and writes findings in a report for your doctor. Because it's non-contrast, this version is read specifically for what fresh blood and bone injury look like without any dye enhancing the picture.
CT HEAD PLAIN means exactly that, a plain, non-contrast scan. No dye is injected into your vein at any stage, which is why emergency departments often reach for this version first.
- Fresh blood inside the skull is dense and shows up well on plain images, so a bleed can often be caught without dye - Skull and facial fractures are bone, and bone is naturally well seen on any CT, contrast or not - Skipping contrast means skipping the pre-scan questions about kidney function and iodine allergy, which saves time when every minute counts - It's usually faster to arrange, since there's no wait for kidney tests to come back
A plain scan can miss things that only light up with contrast, such as some tumors, infections, or subtle vascular problems. If your doctor still has questions after seeing the plain images, they may ask for a contrast-enhanced follow-up scan rather than repeating the plain one.
It means no contrast dye is injected before or during the scan. You'll get cross-sectional images of your brain and skull using X-rays alone.
A plain scan is usually faster to arrange because there's no need to check kidney function or screen for an iodine allergy first. It's often the first scan ordered after a head injury or a sudden severe headache, when fresh bleeding needs to be ruled out quickly.
No. Since no contrast dye is used, there's usually no fasting requirement, but confirm with the centre when you book, since instructions can vary by case.
Yes, some tumors, infections, and vascular issues are easier to see with contrast. If your doctor is still concerned after a plain scan, a contrast-enhanced study may follow.
This page is general information about the test, not medical advice. Your own report's reference ranges apply — please discuss your results with your doctor.
Tell the centre if you're pregnant or think you might be before any scan. RadiologyInfo.org notes that a head-only CT does not deliver a radiation dose to the fetus, but your doctor will still confirm the scan is necessary.
Turnaround varies by centre and case urgency, so ask the centre directly for a timeline rather than assuming a fixed number of hours or days.
Yes, metal near your head, like earrings, hairpins, or a nose ring, can interfere with the images, so you'll be asked to remove them before the scan.