List three medical services that a psychiatrist can provide but a psychologist cannot.

The difference between psychologists and psychiatrists is that a psychiatrist is a medical doctor and a psychologist is not a doctor. The three medical services that a psychiatrist can provide but a psychologist cannot are:

As psychiatrist is a medical doctor, he can prescribe medicines to treat mental health, he is allowed to order for brain images like CT scan, MRI etc. where a psychologist cannot. He can also order to perform laboratory tests.