Before you can get a visa for certain countries, you may need to do specific health tests. These tests are different from the medical exams needed for flying (like CLASS II or CLASS I) and are not related to DGCA rules. To find out which tests you need and which hospitals can do them, check the official visa website of the country you want to visit. Remember, each country has its own rules for these health exams. So, make sure you know and understand these rules before you travel. This will help make the process of getting ready for international travel easier and smoother.