Veins and arteries vary in size from one patient to another and from one side of the body to the other. Obtaining a blood sample from some people may be more difficult than from others.
Other risks associated with having blood drawn are slight but may include:
There is a very slight exposure to radiation from the radioisotope. The radiation is minimal, and the materials "decompose" (are no longer radioactive) in a very short time. Virtually all radioactivity is gone within about 12 hours. There are no documented cases of injury from exposure to radioisotopes. The scanner only detects radiation -- it does not give off radiation.
Most nuclear scans (including an RBC scan) are not recommended for women who are pregnant or breastfeeding.
Scans may need to be repeated over 1 or 2 days to detect gastrointestinal bleeding.
Bjorkman DJ. Gastrointestinal hemorrhage and occult gastrointestinal bleeding. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders; 2007:chap 137.
Segerman D, Miles KA. Radionuclide imaging: general principles. In: Adam A, Dixon AK, eds. Grainger & Allison's Diagnostic Radiology: A Textbook of Medical Imaging. 5th ed. New York, NY: Churchill Livingstone; 2008:chap 7.
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