Final answer:
The nurse should test for the presence of cerebrospinal fluid (CSF) following the findings of clear fluid coming out of the nose.
Step-by-step explanation:
The nurse should test for the presence of cerebrospinal fluid (CSF) following these findings. Clear fluid coming out of the nose suggests a possible basilar skull fracture which can result in a tear in the meninges, the protective membranes surrounding the brain and spinal cord. This tear can lead to a leakage of CSF from the nose.