Antibiotic sensitivity
If the organism shows drug resistance to the antibiotics used in the test, then those antibiotics will not be effective treatment.
Smith MB, Woods GL. In vitro testing of antimicrobial agents. In: McPherson RA, Pincus MR, eds. Henry's Clinical Diagnosis and Management by Laboratory Methods. 21st ed. Philadelphia, Pa: Saunders Elsevier; 2006:chap 57.