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Schilling test
Definition:
The Schilling test is used to determine whether the body absorbs Vitamin B-12 normally. Alternative Names:
Vitamin B12 absorption test Text Continues Below
How the test is performed:
The patient is given two doses of Vitamin B-12 (cobalamin). The first dose is radioactive and taken by mouth. The second dose is not radioactive and is given as a shot 2-6 hours later. The injection of Vitamin B-12 may sting. Urine is then collected over the next 24 hours to measure whether Vitamin B-12 is normally absorbed. This test may be performed in four different stages to find the cause of low Vitamin B-12 levels. Stage I is as described above. If Stage I is abnormal, Stage II may be done 3-7 days later. In Stage II, patients receive radioactive B-12 along with intrinsic factor. Intrinsic factor is produced in the stomach and binds (attaches) to Vitamin B-12. Stage II can tell whether low Vitamin B-12 levels are caused by problems in the stomach that prevent it from producing intrinsic factor. If a Stage II test is abnormal, a Stage III test is performed. In the Stage III test, the Stage II test is repeated after the patent has taken antibiotics for two weeks. This can tell whether the abnormal growth of bacterial has caused low Vitamin B-12 levels. A Stage IV test determines whether low Vitamin B-12 levels are caused by problems with the pancreas. Here, the patient is given pancreatic enzymes for three days, followed by a radioactive dose of Vitamin B-12. A 24-hour urine sample is needed. For adults: - On day 1, urinate into the toilet after getting up in the morning.
- Collect all subsequent urine (in a special container) for the next 24 hours.
- On the morning of day 2, urinate into the container after getting up.
- The test is now complete.
- Cap the container. Keep it in the refrigerator or a cool place while urine is being collected.
- Label the container with your name, the date, the time you last urinated, and return it as instructed.
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