@fightinghopefully, I can understand that this would have you concerned, especially if your doctor appeared shocked as well. Several members have reported high or drastically fluctuating chromogranin A (CgA) levels. For this reason, I moved your post to this discussion that @kaforester3 started:

- High or Fluctuating Chromogranin A Level: What does it mean? https://connect.mayoclinic.org/discussion/chromogranin-a-level-was-539/

I did this so you can read previous posts and connect easily with fellow members like @tomewilson @tdalton61 @microbe1943 @musicflowers4u @dbmenger @tracyfurtiscaudle who have experienced high CgA results.

A high result can be caused by several factors. As others have shared, medication can be the cause or conditions of the test or where you had it done. Have you started any new medications lately? Has your doctor ordered to have the test done again to see if it was an anomoly? Or further tests to rule out recurrence?