Up to 40 percent common tests to determine nerve and muscle function of injured workers may be inaccurate, according to research by Parsippany, NJ-based One Call Medical.

The firm spotlighted problems with nerve conduction studies (NCS) used to evaluate the function of the motor and sensory nerves, and electromyography (EMG) used to examine health of muscles and nerves controlling the muscles.

One Call, which does diagnostic testing for workers' compensation said its research was based on information gathered from studies performed by providers outside of the One Call Medical network.

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