Switch from RIDT to molecular test could help prevent spread of flu, reports the Pittsburgh Post-Gazette.

Known as molecular testing, the new devices use the same sample from a patient as RIDT — typically a swab from deep inside your nose — to look at the RNA or DNA of the virus cell to tell exactly what it is, virtually eliminating false negatives.

Though large, centralized labs at UPMC, Allegheny Health Network and others have had these devices for several years, health networks and doctors are now getting them for outpatient sites.