What is the purpose of testing a stretch reflex?

Reflex tests are used to determine the strength of various reflexes. According to the Encyclopedia of Children's Health, reflex tests are used to test the integrity of the spinal cord.

A Practical Guide to Clinical Medicine claims that reflex tests provide an assessment of the nervous system at many different levels. Reflex testing incorporates both the motor and sensory pathways and can be used to assess whether or not there is any spinal or nerve damage present. With the results of these tests, doctors can potentially locate an injury based on where the test indicates a normal or abnormal reaction.