Trotter
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Test for what?
The prescence of depression itself.
Medicine is not an exact science. A doctor listens to what you say is bothering you, checks out your vital signs, and maybe runs a few tests. He then makes and educated guess as to what ails you, and writes a prescription for what is his educated guess of what will best treat what he thinks might be wrong with you. True, sometimes things are down-right obvious, but not always.
Depression is silent, with few physical signs (other than those brought about by its other stmptoms). Those who suffer from it usually do so in silence, not knowing what is wrong with them, and feeling ashamed of the way they feel.
By trying a person on an antidepressant, a doctor can help rule out depression caused by a chemical imbalance.