I am an 11 year lung cancer survivor. why would my cea level be high, (3.9), & mono% be high, (13.0), yet cat scans, ultra sounds all show no cancer.

Uncertain: The CEA level is only slightly elevated, and may be due to other factors, especially smoking. After 11 years of being cancer-free, cancer is unlikely, but can't be ruled out, because a recurrence can be too small to detect by ct scans and ultrasound. Your doctor will want to follow you closely. The mono% (monocytes?) doesn't have much to do with carcinoma one way or another.