As far as I know, there is no specific blood serology required for obtaining a 13A visa in the Philippines. A 13A visa is a type of visa for foreign nationals who are married to a Filipino citizen and wish to reside in the Philippines for an extended period.
However, the Bureau of Quarantine may require a medical examination for certain types of visa applications, which may include blood tests such as a serology test. The Bureau of Quarantine may require this test to determine the presence of infectious diseases such as HIV, hepatitis B or C, and other sexually transmitted diseases.
It's best to consult with the Philippine embassy or consulate in your country of residence for specific requirements and guidelines regarding the 13A visa application process.
i hope this will help you.
