Finding the right tests…
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Finding the right tests…
Sonography
RENAL DOPPLER checks the arteries carrying blood into your kidneys and the veins carrying it back out, looking for narrowing known as renal artery stenosis. A kidney that senses reduced blood flow releases hormones that raise blood pressure throughout your body, which is why this narrowing is a documented, treatable cause of high blood pressure in some people, particularly when it doesn't respond well to usual medication. The same scan is used differently in someone with a transplanted kidney, where it checks whether the new kidney's blood supply through its surgically connected artery is working as it should, since a narrowing at that connection point is a recognized and correctable complication after transplant.
This scan measures blood flow speed in the renal arteries and veins, checking for narrowing, blockage, or an unusually fast reading at the point where a transplanted kidney's artery was connected. Your doctor reads it alongside your blood pressure and kidney function tests rather than as a stand-alone answer.
Each kidney gets its blood supply from a renal artery branching off the body's main blood vessel. When that artery narrows, usually from plaque buildup or, less often, a condition called fibromuscular dysplasia that affects younger people, the kidney senses less blood arriving than it expects.
A kidney that senses reduced flow responds as though your whole body's blood pressure were too low, releasing hormones that constrict blood vessels and make the body hold onto salt and water. That reaction raises blood pressure well beyond the kidney itself, a condition called renovascular hypertension, and it's estimated to account for a small share of all high blood pressure cases, more often the ones that resist standard medication.
In a transplanted kidney, the artery is surgically connected to a different vessel than the body's original setup, and a narrowing can develop right at that connection point. Doppler measures blood flow speed there, and a distinctly high reading at the junction is a recognized sign of narrowing that can often be corrected if caught.
This scan doesn't replace blood pressure monitoring or kidney function tests. Your doctor combines all three before deciding whether treatment is needed.
It's a narrowing of the artery carrying blood into one or both kidneys, usually from plaque buildup or, less often, fibromuscular dysplasia. This scan is built to detect that narrowing directly.
It can help find one possible cause. A narrowed kidney artery is a documented cause of high blood pressure that sometimes doesn't respond well to standard medication, which is why your doctor may order this scan alongside blood tests.
This scan checks the blood supply through the artery connecting the transplanted kidney, since narrowing at that surgical connection point is a recognized complication that can often be corrected if caught.
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.
A regular kidney ultrasound looks mainly at the kidney's structure and size. This scan adds Doppler measurements of blood flow speed in the renal artery and vein, which a standard image alone doesn't capture.
No, it's a painless scan done with a probe and gel against your abdomen or back, without any needle or injection.
That depends on the centre and your doctor's instructions, since bowel gas can affect the view of these vessels. Ask your doctor or the centre directly what they'd like you to do beforehand.
Yes, both renal arteries are usually imaged in the same visit so your doctor can compare blood flow on each side.
Not necessarily. Your doctor weighs the finding alongside your blood pressure readings and kidney function before deciding whether treatment is needed.