Liabilities tool for occult blood?

In this video, Dr. Narendra Saini, MBBS, MD, Internal / General Medicine, will talk on liabilities tool for occult blood. Occult blood means the blood is passing through upper gastrointestinal tract. For this test, the patient shouldn’t have taken iron because it will give false positive report. Also, iron is in high quantities in cabbages, cauliflower, banana, apple etc. should be avoided before an occult blood test. The necessary precautions to be taken for this test to avoid false positive test.