Thank you for your response, and I'm sorry that you've had to deal with Covid and all the resulting uncertainty. My husband never got the virus, although he's had lots of other complications since the Whipple, some of which may have resulted in raising his CA19-9 as high as 700 a couple of years ago. He also had it checked with scanning, and it was clear at the time. His test results have fluctuated enough in the past (mostly below 100) for the oncologist to stop testing him. It was more anxiety producing than beneficial. The drawback is that we really don't know how long his CA has been high, if it was a gradual increase or a big jump. As it is, we can't really correlate it with his health changes. The high numbers possibly relating to IBS or lung problem are certainly possibilities. We're seeing a lung specialist in a couple of days, so maybe he'll have some answers for us sooner than 2 weeks? Fingers crossed!