Generally a visual examination of the skin is all that is needed to diagnose scabies. However, your dermatologist may take a small scrape of the skin to examine under a microscope. The typical treatment is prescription medicated creams applied liberally all over the body. It takes a few days of treatment before the sensation of itchiness begins to go away.
To help prevent further spreading, be sure to clean all clothes and linen in hot water and dry with high heat. Dry clean items you cannot machine wash in this manner or place the item in a sealed plastic bag and put it away for two weeks. The mites will die without a food source for this length of time.