A system uses clinical data to help identify incorrect demographic information (such as gender or age) of a patient that may cause an erroneous critical or abnormal indication in medical tests and uses results of a clinical test to indicate possible demographic errors and various methods to modify a workflow to incorporate alternative tasks or to request verification of specific demographic facts. A system for validating patient medical information includes an input processor for receiving a laboratory test result value of a particular patient. A data processor automatically compares the received laboratory test result value with a predetermined normal value range for a patient having demographic characteristics of the particular patient, and compares the received laboratory test result value with a predetermined normal value range for a patient having different demographic characteristics than the particular patient. A communication processor initiates generation of an indication to a user indicating stored demographic information of the particular patient may be inaccurate.