How high is too high for Chromogranin A? Mine was 2590 and urine 5-HIAA, somatostatin level elevated. Nuclear PET and Octreo scan both show possible tumors, curve (uncinate) of pancreas, abdomen and pelvis. LDCT lung scan for smoker shows 6-7 < m nodules in both lung bases. All of the sudden an MRI is done and everything seen on scans is no more? Which tests are lying. It all started with 40 pound wgt loss, diarrhea, cramps, left/right upper abd pain around to mid back, nausea and vomiting bile, headaches, mid back pain ALL since 1-2023.