Laboratory investigations include:


  • Blood test  for Uric acid : It shows increased level of uric acid but hyperuricemia does not necessarily indicate gout.


  • Urine test : Especially done if the patient is young and has pronounced hyperuricemia. Increased excretion of uric acid in 24 hours might be related to a metabolic disorder.


  • X-Ray : In the early stage it is hardly helpful. But in chronic stage it shows small, well defined, punched out areas (tophi) near the articular end of bone and within the soft tissues. X-ray is more useful in assessing the progress of disease in its later stage.


  • Synovial fluid examination : It is done to rule out infection. Presence of monosodium urate (MSU) crystals, which can be detected with polarized light is an indicator of gout.