Endocrine system?

how does a comprehensive metabolic panel w/EGFR test, indicating aLOW range of 58 ((normal or accepted ranges for this particlar method of testing = greater than or less than 60 mL/min/1.73m2...(test results for non-african american male).since this test is a test for possible cancer, how is a LOW test result defined--in general ? what is the general indication of a LOW result? ay= (BAYER CHEMILUMINESCENT METHOD)