Had one high monocyte count on blood work but monocyte absolute is normal. is this a concern?

Abnormal test result: In general, we know that any lab test has a "normal range", but that the results can change from day to day, or hour to hour. If you feel fine (no fevers, night sweats, unexplained weight loss) and the test was just done as a routine, then don't worry. It will likely be normal next time it is tested. If the test remains abnormal, the doctor will look into it further and run more tests.