<prompt> Which of the following can be used as a diagnostic modality for herpes labialisTzanck smearCultureGram stain under microscopePCR assay  <response>: PCR finds the genetic material DNA of the HSV virus. This test can tell the difference between HSV-1 and HSV-2. Using the PCR test on skin sores isnt common. PCR is used mainly for testing spinal fluid in rare cases when herpes may have caused an infection in or around the brain. Antibody tests. Serologic tests are often used to detect HSV because they can differentiate between HSV-1 and HSV-2. There is an FDA-approved point-of-care test called POCkit that gives results from capillary blood or serum during an office visit. These tests are 80 to 98 sensitive and more than 96 specific. Ref Harrison20th edition pg ,977 