Abdominal and Pelvic Blood Vessel Ultrasound (limited)

What it is

"Duplex" means two things at once. The first is the ordinary grey picture of anatomy that any ultrasound produces. The second is Doppler, which reads the shift in pitch of the echoes coming back from moving blood cells and turns it into a measurement of how fast the blood is going and in which direction. Put together, they let a sonographer see a vessel and say whether the flow inside it is normal, sluggish, reversed, or absent. This code is the abdominal, pelvic, and retroperitoneal region — the aorta and its branches, the veins draining the liver and spleen, the vessels of the kidneys, including a transplanted one. It is the limited study, meaning the exam was directed at a specific question rather than working through every vessel in the region, which is what the complete version of the code describes.

Why it is done

• To check flow into and out of a transplanted kidney, which is one of the most common reasons this limited study is ordered
• To assess the arteries supplying the kidneys when narrowing is suspected
• To look at the direction and speed of flow in the portal vein and the vessels around the liver in people with liver disease
• To follow a known aneurysm of the abdominal aorta, or a repair of one
• To ask whether a mass or an organ has a normal blood supply
• To recheck a single finding from an earlier scan without repeating the whole examination

What to expect

A sonographer spreads warm gel on the abdomen or flank and presses a probe against it, angling to line the beam up with the vessel being measured. Doppler adds sound: the flow is often played aloud as a pulsing or swishing noise, which is normal and is part of how the study is done. Breath-holds are usually asked for, since the vessels move with the diaphragm. Fasting beforehand is often requested, because gas in the bowel scatters the sound waves and can hide the very vessels being looked for — the instruction comes from the imaging department and varies. Nothing is injected and there is no radiation. The images and measurements are interpreted afterwards by a physician, who issues the report.

Questions worth asking

• Is this the limited study or the complete one? They are separate codes with a meaningful price difference, and the report should say which was performed.
• Will a standard abdominal ultrasound be billed alongside the duplex study, or is the grey-scale imaging included in it?
• Is there a separate charge for the physician's interpretation on top of the charge for performing the scan, and is that physician in network?
• If this is a repeat scan to follow something already known, how often will it be repeated and will each one be billed the same way?