If the symptoms of depression in your child have lasted for at least two weeks, you should schedule a visit with his or her doctor to make sure there are no physical reasons for the symptoms and to make sure that your child receives proper treatment. A consultation with a mental healthcare professional who specializes in children is also recommended.
A mental health evaluation should include interviews with you (as the parents) and your child, and any additional psychological testing that is necessary. Information from teachers, friends, and classmates can be useful for showing that these symptoms are consistent during your child's various activities and are a marked change from previous behavior.
There are no specific tests -- medical or psychological -- that can clearly show depression, but tools such as questionnaires (for both the child and parents) combined with personal information can be very useful.
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