Tuesday, October 12, 2010

Q: How much blood is needed to turn guaiac-based fecal occult blood test positive?


Answer: About 10 ml over 24 hours

Normally, there is only about 1-2 ml of blood a day that escapes blood vessels into the stool per day.The common, traditional guaiac-based fecal occult blood test usually picks up a daily blood loss of about 10 ml