A pt 50 years age comes with weakness for 5-6 months, with anemia, occult blood in stool present. What is the best initial investigation for him :
|B||CT with contrast|
Colorectal cancer can take many years to develop and early detection of colorectal cancer greatly improves the chances of a cure, screening for the disease is recommended in individuals who are at increased risk. There are several different tests available for this purpose.
a. Digital rectal exam (DRE):
b. Fecal occult blood test (FOBT): a test for blood in the stool. Two types of tests can be used for detecting occult blood in stools i.e. guaiac based (chemical test) and immunochemical. The sensitivity of immunochemical testing is superior to that of chemical testing without an unacceptable reduction in specifity.
b. Colonoscopy: A lighted probe called a colonoscope is inserted into the rectum and the entire colon to look for polyps and other abnormalities that may be caused by cancer.
c. A colonoscopy has the advantage that if polyps are found during the procedure they can be immediately removed.
d. Tissue can also be taken for biopsy , colonoscopy or FOBT plus sigmoidoscopy are the preferred screening options.