Home use tests allows test for some diseases or conditions at home. They have low cost, require less time and are used for marketing purpose.
Home use tests possible health conditions when there is no symptoms, so that one can get early treatment and lowers chance of developing later complications (i.e. cholesterol testing, hepatitis testing), detects specific conditions when there are no signs so that one can take immediate action (i.e. pregnancy testing), monitor conditions to allow frequent changes in treatment (i.e. glucose testing to monitor blood sugar levels in diabetes).