For a gout sufferer on uric acid lowering treatment 2.9mg/dL(0.17mmol/L) means the meds are working, your level is safe, and six to twelve months should see an end to all old uric acid crystals (depending on how long you have had gout)
?
Low is meaningless in medical terms, but in statistical terms I think it is either one or two standard deviations below the mean, but not something I care to investigate at the moment.
http://www.goutpal.com/633/uric-acid-blood-test/