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The study should be performed while the patient is actively bleeding. Although the test is sensitive and can detect intermittent bleeding, it may not always localise the exact anatomical site. SPECT/CT can be used to provide anatomical localisation when bleeding is detected.
To detect sites of active GI bleeding prior to angiography and/or surgery.
The patient's red blood cells are labelled with a radiotracer, this takes about 40 minutes.
Images are acquired for approximately 1 hour and then at intervals up to 24 hours after injection, or until bleeding is detected. Sites of active bleeding can be identified on serial views of the abdomen and pelvis.
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