The Occult Blood Test

The occult blood test.

The original occult blood tests were designed for forensic purposes, Schonbein and van Deen using a chemical test with guaiacum which was more sensitive than the older Teichmann's haemin crystal test. Subsequently similar chemical methods were widely used and in I893 Weber described his version of the guaiacum test for detecting occult blood in the faeces. Boas first made extensive use of this ...

False Negative Fecal Occult Blood Test: Prozone Effect

Dear editor, the fecal occult blood test is the presently widely used screening laboratory test for colorectal cancer. At present, the test is usually based on an immunological diagnostic principle (1, 2). A false positive fecal occult blood is common and widely mentioned in literature. Nevertheless, the false negative is little mentioned in the paper. Here, the authors discuss the issue of the...

unochemical Fecal Occult Blood Test–Positive Individuals

Downlo kground: We aimed to define the potential of the fecal DNA assay as an alternative or in addition to rrently used immunochemical fecal occult blood test (iFOBT) for the early diagnosis of colorectal . thods: A total of 560 individuals aged 50 to 69 years with a positive iFOBT were recruited from an FOBT regional screening program. Twenty-six were diagnosed with adenocarcinoma, 264 with i...

NCD for Fecal Occult Blood Test

Faecal Occult Blood Test in Intestinal Helminthiasis

Enteric helminthic infection is one of the most important public health issues in developing countries. These infections are transmitted by faeco-oral route and cause significant morbidity among patients of all age groups, especially in school age and preschool age children. The clinical presentation may be vague and non-specific. Frequently, patients with enteric helminthic infection (especial...