Hello and thank you for your enquiry.

When a FIT test result is any level above 10 it is said to be positive. But I think FITs that are very positive (above 100 or higher) confer the highest priority in terms of getting a colonoscopy to find out what is causing the bleeding/symptoms. So tests at this level are more of a concern although even then, most people with a test in this range won't turn out to have cancer.  This is because there are a number of others causes of bleeding from the bowel. So it isn't possible to be very sure of things based on a FIT level, and important to keep an open mind, until the colonoscopy has been done. 

I appreciate that waiting to find out more is unsettling and I hope your sister has her colonoscopy soon to find out what is going on. 

Please get back to us if you need any more information or support.  You may find it helpful to talk things through with one of the nurses on our helpline.  The number to call is Freephone 0808 800 4040 and the lines are open from 9am till 5pm Monday to Friday.

Yours sincerely,

Vanda