Can an epidural steroid injection be used for diagnostic purposes or is it only a nerve block that can diagnose where the pain may be coming from?
Almost universally, epidural steroid injections (ESI) contain a numbing agent like lidocaine. This anesthetic allows a diagnostic component as structures will be “numbed”. The ESI is a variation of Transforaminal ESIs and Selective Nerve Root Blocks (SNRB), which are more precise. The goal of the ESI depends upon why it is being used. See: