Mini Mental Status Exam (MMSE)
The Mini-Mental Status Exam is a five-minute screening test that is designed to evaluate basic mental function in a number of different areas. Some of the areas tested involve a person's ability to recall facts, to write and to calculate numbers. The test provides a quick way to determine if more in-depth testing is needed.
The MMSE was designed to give a practical clinical assessment of change in cognitive status in geriatric inpatients. It covers the person’s orientation to time and place, recall ability, short- term memory, and arithmetic ability. It may b used as a screening test for cognitive loss or as a brief bedside cognitive assessment. It cannot be used to diagnose dementia.
Each area of the test is given a score. These scores show if the person is functioning within the expected range for his or her age. If there are signs of a problem, the individual giving the test will suggest further testing. 
In terms of content validity, the MMSE measures eight of the 11 main aspects of cognitive status; it omits abstraction, judgment, and appearance. Although factor analyses have used different types of sample and differing versions f the MMSE, they commonly indentify factors relating to orientation, memory, and attention.
McDowell, I. (2006). Measuring Health: A Guide to Rating Scales and Questionnaires. Madison Avenue, New York: Oxford University Press, Inc.
Crum RM, Anthony JC, Bassett SS, Folstein MF. Population-based norms for the mini-mental state examination by age and educational level. JAMA. 1993.
Folstein MF, Folstein SE, McHugh PR. "Mini-mental state": a practical method for grading the cognitive state of patients for the clinician. J Psychiatr Res. 1975.
Rovner BW, Folstein MF. Mini-mental state exam in clinical practice. Hosp Pract. 1987.
Tombaugh TN, McIntyre NJ. The mini-mental state examination: a comprehensive review. J Am Geriatr Soc. 1992;40(9):922-935.