kidney ultrasound
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Anon_129915 posted:
I have been told to drink between 32 - 64 oz water one hour before test. I don't see anything about this as something to do before procedure. Does that mean they will have me urinate before test or must kidneys be full for the test.
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john-skpt responded:
It depends on exactly what they are looking for on the test.

Probably the reason for the water is to make sure that you are properly hydrated, and that your blood volume is at a good level. Most doppler ultrasounds want to look at the vascular system in an organ and at how the blood is flowing to all parts of the organ. If the blood stream is depleted, then things won't show up right on the test.

It is vaguely possible that they will image a full bladder and then an empty bladder, but that is not very common. Generally a different test would be used for this purpose (IVP, intravenous pyelogram).

There are also "urodynamic studies" to see how the bladder is filling and emptying, but that too is different from a renal ultrasound.