The milk intended for human consumption must meet the terms of safety and human security. The purpose of this dissertation was to evaluate the raw milk quality with pasteurized milk. A variety of diagnostic tests are routinely used to evaluate milk quality on dairy farms. Tests such as bulk milk bacterial counts, bulk tank somatic cell count and tests for adulterants such as water, sediment or antibiotics are routinely used. This study reviews practical applications and supporting research of tests that are commonly used to investigate and solve milk quality and microbial load on dairy practices.