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CT Scan
Triple phase CT abdomen, also written as TPCT Abd, is a specific way of timing a contrast scan rather than a different body region. After contrast goes in through a vein, images are taken at three points, an early arterial phase, a portal venous phase, and sometimes a delayed phase, as the dye moves through the liver. This timing matters because some liver lesions, hepatocellular carcinoma among them, stand out clearly during only one phase and can be missed on a single-pass scan. This protocol is genuinely different from a standard contrast abdominal CT, and it's ordered specifically when a liver lesion needs to be characterized rather than just located.
The radiologist compares how the liver, and any lesion in it, enhances across the arterial, portal venous, and delayed phases. This pattern of enhancement and washout is what points toward a specific diagnosis rather than just showing a spot on the liver. A detailed report explaining the pattern goes to your doctor.
A standard contrast abdominal CT takes images at roughly one point in time after contrast is injected. Triple phase CT abdomen instead captures the liver at three separate moments, an early arterial phase, a portal venous phase, and often a delayed phase, tracking how contrast moves in and out of the liver and any lesion within it.
Liver lesions like hepatocellular carcinoma tend to draw blood from the artery early and then lose contrast faster than normal liver tissue in later phases, a pattern known as washout. This behavior is often only visible when the liver is imaged at multiple time points, which is exactly what this protocol is built to capture.
- Contrast is given through a vein, so mention any past reaction to injected dye - Kidney function matters, since the contrast is cleared through the kidneys - This involves more x-ray exposure than a single-phase scan, since images are taken at multiple points, so tell your doctor about any chance of pregnancy
Your doctor or the centre will confirm any fasting instructions specific to this protocol.
It means the scan takes images at three separate points in time after contrast is injected, rather than just once. These are typically an early arterial phase, a portal venous phase, and sometimes a delayed phase. Each phase shows the liver and any lesion differently, which is the whole point of the protocol.
A standard contrast abdominal CT is usually timed for one phase, which shows the liver and other organs reasonably well but can miss the specific enhancement pattern that identifies certain liver lesions. Some tumors, hepatocellular carcinoma included, only stand out clearly during one particular phase.
Yes, because images are captured at multiple time points instead of one, this protocol involves more radiation exposure than a single-phase contrast CT. Your doctor orders it specifically when that extra detail is needed to characterize a liver lesion.
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.
The dye itself is the same iodine-based contrast used in other contrast CT scans. What's different is the timing, with three separate scans taken as the same dose of contrast moves through your liver.
It's usually ordered when an earlier ultrasound or scan has already found something in the liver that needs a closer look, or when hepatocellular carcinoma is a specific concern. It's also used in planning before liver surgery or a transplant evaluation.
As with other contrast scans, some fasting is often required, but the exact instructions depend on your case and the centre's protocol. Confirm directly with your doctor or the diagnostic centre before your appointment.
Tell your doctor about any kidney disease before this scan, since the iodine-based contrast is cleared through the kidneys and this protocol still involves a standard contrast dose. In some cases, an alternative imaging test may be considered instead.
Tell your doctor and technologist about any chance of pregnancy before the scan, since it involves more x-ray exposure than a single-phase CT. Doctors generally avoid this kind of imaging during pregnancy unless there's no safer alternative.