The psoas test is a physical test for inflammation, usually an acutely inflamed appendix on the right side, in the region of the psoas muscle. The hint that such inflammation is present is given by the position that the patient assumes to reduce discomfort: leg flexed at the hip on the affected side.
The psoas test is said to be positive if, with the patient lying on the opposite side, hyperextension of the affected hip produces pain.
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