Final answer:
A client with whiplash should be referred to a physician upon initial complaint of neck pain and if there is persistent neck pain after self-administered treatments, not only in severe cases.
Step-by-step explanation:
When dealing with whiplash, which is a common neck injury, it is crucial to know when to refer a client to a physician. You should refer a client to a physician upon initial complaint of neck pain. This recommendation is due to the serious nature of whiplash injuries, which can sometimes involve not just musculoskeletal damage, but also neuromuscular issues that could require more advanced medical intervention. Additionally, if there is persistent neck pain after conservative management, such as self-administered treatments that don't lead to improvement, this warrants a visit to a doctor. Not only severe cases should be referred but also any case where symptoms continue despite initial remedies or where there are symptoms that suggest a more complex injury.