Not currently. According to the Alzheimer’s Association, MCI is a “clinical” diagnosis representing a doctor’s best professional judgment. There are currently no tests or procedures to demonstrate conclusively that a person has MCI.
The demarcations between normal cognition and MCI, and between MCI and Alzheimer’s, are difficult to define. Clinical judgment and cognitive testing over time is needed. Therefore, experts recommend that a person diagnosed with MCI be re-evaluated every six months to determine if symptoms are staying the same, improving or growing worse.
The Mayo Clinic web site has a good overview of MCI Tests & Diagnosis.
The Alzheimer’s Association and the National Institute on Aging (NIA) have convened expert workgroups to update the diagnostic criteria and guidelines for MCI.