QNS is the abbreviation for Quantity Not Sufficient or Quality Not Sufficient. When referring to molecular testing, i.e. nucleic acid or DNA based tests; a final result of QNS is given when the laboratory cannot amplify the submitted sample acceptably. In the case of insufficient Quantity, this typically means that not enough human cells were collected or submitted in the sample to amplify the internal control for at least a negative test result. The internal control monitors sample colle...