Many hospitals use outside labs for some, most, or even all of their susceptibility testing. We also know that, in some cases, those results might not make it into the hospital LIS. NHSN’s AR Option will accept whatever results a hospital provides through its LIS. Not having those reference or outside lab results should not preclude a hospital from reporting whatever susceptibility results they do have in their LIS. At the same time, NHSN has some minimum results requirements. A hospital may qualify for an exclusion in rare instances where the following conditions are met: They have an LIS for non-microbiology data (e.g., hematology or chemistry results), but don’t have an LIS for microbiology data. The AR data required for submission to NHSN are not available in the LIS. In such cases, the hospital would functionally qualify for an exclusion based on lack of an electronic LIS.