No, you need a colonoscopy for that.
Take care.
http://www.webmd.com/colorectal-cancer/guide/tests-given-colorectal-cancer
Plz read the link and tell me then??
"Ultrasound may be used in colon cancer to determine if the cancer has SPREAD. "
Quoted from your link.
In that case, cancer has already been diagnosed. The objective of the ultrasound is to determine if it has spread and how far.
Biopsies are needed via colonoscopy to diagnose colon cancer.