Look for crystal in. Analysis of joint fluid. Your doctor inserts a needle into your joint to extract a small sample of joint fluid for analysis with a microscope. He or she looks for cppd crystals in the fluid. X-rays. X-rays of your knee can reveal other conditions caused by cppd crystals, such as crystal deposits in the joint cartilage (chondrocalcinosis) and joint damage.
Several tests. Including imaging studies from x-rays, ultrasound, MRI and CT scans. Still to confirm psedogout the best test is to analyse the synovial fluid from the affected joint and detect the crystals consistent with psedugout. Also there is blood test of the associated diseases with pseudogout, like for example iron studies in hemochromatosis.