Can I get a health certificate directly without making an appointment?

Of course. You don't need to make an appointment to get a health certificate. You can apply directly to the hospital, bring your ID card and two one-inch color photos, and go to the relevant departments (centers for disease control and prevention or health institutions approved by the Ministry of Health to undertake preventive health checks) to ask the staff about the specific process. Generally, you go to the form collection office, fill in the basic personal information, post photos (in some places, you can take photos for free, and ask yourself), then go to the price-drawing office and the payment office to pay for a medical examination.