Called WN, had them drop the number and re-add (as others have said to do), but it still didn't work. Same deal for second existing reservation. Many here have said that you should get it if you add the number after the fact, but it didn't work for me. Tried every work around and spent time talking to the WN folks on the phone... to no avail. Only starting getting precheck for reservations booked after adding the KTN to my WN profile.
1 You may drink water, as much water as you can would be helpful, until arrival. 2  Routine medications may be taken, unless you have been instructed otherwise. If you are diabetic, you may take your diabetes medication no less than 4 hours prior to the exam.  Arrive 15-30 minutes before your PET scan.
Re: Suggestions on what to eat before a colonoscopy. You can eat red meat. I wouldn't go OVERBOARD - mostly with the iron rich foods, they are talking about things like liver (yuck) and definately NO iron supplements. Red meat isn't the same as red dye - which is what they want you to avoid.