One of the most common problems an obstetrician faces is evaluation of a patient for PROM. Proper assessment of the patient requires a careful integration of history, physical examination, and clinical testing. The most commonly used tests are analysis of vaginal pH with nitrazine paper and evaluation of vaginal secretions with the arborization test. When history, nitrazine, and arborization testing are used in combination, 90% of cases will be diagnosed correctly. When the diagnosis is questionable, other modalities, including ultrasound evaluation and intraamniotic dye injection, should be used as indicated.