Hpv question Can someone explain this to me.

This was at the bottom of the test results and I would like to know what it means thank you

CASE COMMENTS: The specificity and positive predictive value of high risk HPV for CIN 2+ on biopsy varies according to different studies; in one study it is approximately 30-40%, depending on the population (Szarewski, et al, Cancer Epidemiological Biomarkers, Nov. 2008). Therefore, cytology may be negative in the setting of HPV infection. Follow up as per ASCCP guidelines.