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diethylenetriaminepentaacetic acid, which when labelled with technetium-99m is used as a tracer to obtain scintigrams of the kidney over a period of time, by means of a gamma camera. DTPA is filtered out of the blood by the kidneys and passes into the urine; it is used to show function and reflux. It is particularly useful in assessing obstruction to urinary drainage from the kidneys.

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