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.
If possible, bring copies of your most recent CT, X-ray, or magnetic resonance imaging (MRI) films with you on the day of your PET/CT scan. Be prepared to stay at the imaging facility for approximately two to three hours.