Antibiotic therapy is still the mainstay of medical care for MRSA, but antibiotic therapy is complicated by MRSA's antibiotic resistance. Consequently, laboratory determination of MRSA antibiotic resistance and susceptibility is important in establishing effective antibiotic treatment. Definitive antibiotic therapy depends on using those antibiotics shown in microbiological tests (using Kirby-Bauer antibiotic discs on agar plates [see above diagnosis section]) to effectively reduce and stop MRSA growth. Once the antibiotic sensitivities of the patient sample are determined, the patient can be treated appropriately. Unfortunately, these tests take time (usually several days) before results are available.