Abdominal CT scan (with and without contrast)

The abdomen is scanned before dye and again after it, in one appointment, so the radiologist can see how a spot in the liver or pancreas behaves as blood carrying dye washes through it. That behavior over time is the diagnosis. The pelvis is not included in this code.

This explanation has not been reviewed by a person yet.

What it is

The liver and the pancreas have an unusual blood supply, and the things that grow in them can be told apart largely by how quickly they fill with dye and how quickly they let it go. A single snapshot cannot show that. So the scanner runs over the abdomen with nothing injected, establishing a baseline, and then again once the dye has arrived — sometimes more than once after, at set intervals. What the radiologist reads is not any one image but the pattern across them. A fatty deposit, a benign blood-vessel growth and a cancer can all look similar on a plain scan and behave entirely differently across a series.

Why it is done

  • To characterize a lesion in the liver that was seen on an ultrasound or a single-phase CT and could not be named
  • To investigate the pancreas, where the tissue and any mass in it enhance on different schedules
  • To work up an adrenal nodule, where the rate at which dye washes back out is the measurement that matters
  • To stage a cancer of the upper abdominal organs, or to reassess one after treatment

What to expect

Several hours of fasting and an IV in the arm are standard. The first pass happens with nothing injected. Then the dye runs and the table moves through again, with a wait of a minute or several before further passes. Patients stay on the table throughout, holding their breath on cue each time, so the appointment feels longer than a routine scan even though each individual acquisition is brief. More passes also mean more radiation than a single-phase study, which is why this protocol is reserved for questions that need it.

Questions worth asking

  • Multi-phase scanning is one code, however many passes were made. Does my statement show one charge or several for the same date?
  • How many phases does this facility's protocol use for my question, and does a shorter protocol exist that would still answer it?
  • Would an MRI of the liver, which gives similar timing information without x-rays, cost more or less here?
  • If this is being repeated at intervals to watch a stable finding, what is the interval, and can it be booked at whichever site in my network prices it lowest?

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