Laboratory Tests For Crps

The four factors were derived from clinical symptoms and clinical signs that can be obtained at the bedside.33 CRPS is therefore a clinical, not a laboratory, diagnosis. Interrater reliability is poor. For any test to be validated, the underlying condition must also be validated. The criteria listed above are the first to be validated for CRPS, albeit in a somewhat circular fashion. It has to be noted that there are three levels of confidence in the diagnosis. The most stringent is "research", less so is "clinical", and there is a gestalt category of "not otherwise specified.''

Laboratory tests are subject to the same problems and circular arguments. For example, response to sympathetic block was once considered pathognomonic of RSD until it became apparent that pain did not necessarily involve the sympathetic nervous system.

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