Doctors prescribe an Anti HAV test in the following situations:
Diagnosing acute Hepatitis A infection in patients presenting with sudden onset jaundice, dark urine, pale stools, right upper quadrant pain, nausea, vomiting, and fever where anti-HAV IgM positivity confirms acute HAV as the cause of liver inflammation and guides symptomatic management, dietary counselling, and public health notification.
Assessing immunity status before Hepatitis A vaccination in adults who may have been naturally exposed during childhood where anti-HAV IgG positivity confirms pre-existing immunity, avoiding unnecessary and costly vaccination in already immune individuals while identifying susceptible adults who require immunisation.
Screening healthcare workers, food handlers, sewage workers, and childcare staff where documentation of HAV immunity is required for occupational health clearance, and where anti-HAV IgG testing identifies those who need vaccination to protect both themselves and vulnerable populations they serve.
Evaluating pre-travel immunity in individuals planning travel to HAV-endemic regions including rural India, Southeast Asia, Africa, and Central America where confirmation of immunity status guides decisions regarding pre-travel HAV vaccination to prevent traveller's hepatitis, a common and potentially serious travel-related illness.
Investigating community outbreaks of jaundice and acute hepatitis in schools, residential institutions, and food-related clusters where anti-HAV IgM testing across affected and exposed individuals confirms HAV as the causative agent, enables source identification, and guides outbreak control measures including emergency vaccination of susceptible contacts.
Assessing post-vaccination immunity in immunocompromised patients including those with HIV, organ transplant recipients, and patients on immunosuppressive therapy where vaccine-induced antibody responses may be suboptimal and anti-HAV IgG testing after vaccination confirms whether protective immunity has been achieved.