It is a procedure where fluid is withdrawn (aspirated) from an inflamed joint with a needle and syringe, using a sterile procedure under local anaesthesia. The fluid is sent to a lab where it is analyzed for the presence of uric acid crystals.
The fluid analysis can also rule out other causes of inflammation including bacterial infections.
Presence of needle like crystals of uric acid best viewed under a microscope gives a sure shot diagnosis of gout.
Dr Renu Madan 