Finding the right tests…
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Finding the right tests…
CT Scan
A whole abdomen scan without contrast covers everything from the lower ribs down to the pelvic brim in one appointment, without any iodine dye going into your vein. It captures the liver, gallbladder, pancreas, spleen, kidneys, intestines, and upper ureters using x-rays alone. Doctors choose this version when the question is structural, such as looking for stones anywhere along the urinary tract, checking for bowel obstruction or free air, or when kidney function or an allergy rules out contrast. Because it skips the contrast wait, the appointment tends to move faster than the equivalent scan with dye. It's a wider structural survey than CT upper or CT lower abdomen taken alone.
The radiologist looks across the whole abdomen for stones, bowel gas abnormalities, free air, organ size changes, and calcifications, without any contrast-based detail on blood flow. Findings from every organ in view are written into one report. Your doctor uses this to decide whether contrast or further tests are needed.
This version scans from the lower ribs to the pelvic brim using x-rays alone, covering the liver, pancreas, spleen, kidneys, intestines, and urinary tract in one appointment. It's well suited to structural questions that span more than one region, such as stones anywhere along the urinary tract or a bowel obstruction of unclear location.
Contrast helps most with inflammation and blood flow, which isn't always the question being asked. Skipping it avoids iodine-related risks for people with kidney disease or a contrast allergy, and it means the whole appointment moves faster since there's no wait for the dye to circulate.
- A stone could be anywhere along the urinary tract - Bowel obstruction or free air needs a wide structural look - Contrast isn't an option due to kidney function or allergy
Ask your doctor or the centre whether any fasting applies before your specific appointment.
If the question is structural, like a stone somewhere along the urinary tract or a bowel blockage, contrast usually isn't needed to see it. Skipping the dye also avoids the iodine-related risks for people with kidney disease or an allergy.
Yes, a plain CT covering the whole abdomen can pick up a stone in the kidney, along the ureter, or in the bladder without needing contrast. This is part of why non-contrast CT is the standard first choice for suspected stones.
Preparation depends on your specific case and isn't something to assume from a general description. Confirm directly with your doctor or the diagnostic centre what's expected before your appointment.
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.
This version covers both regions together in one appointment instead of focusing on just the upper or lower abdomen. Your doctor chooses the wider scan when symptoms or an earlier finding don't clearly point to one area.
It carries no risk of an iodine contrast reaction and no added strain on the kidneys from the dye. It still uses the same x-ray radiation as the contrast version, since that part doesn't change.
Tell your doctor and the technologist about any chance of pregnancy before the appointment, since this scan still uses x-ray radiation. Doctors generally avoid CT scans during pregnancy unless there's no safer way to get the needed information.