'Guà hào' literally combines 'guà' (to hang, to register) and 'hào' (number, registration number), reflecting its origin in the traditional practice of hanging a numbered tag at a clinic or hospital to secure one’s place in line. Today, it refers specifically to the process of registering for medical services—whether in person, online, or by phone—before seeing a doctor. This step is mandatory in most Chinese hospitals and clinics and often determines appointment time, department assignment, and even which doctor you’ll see.

The term emphasizes formal access to healthcare rather than casual consultation; without guà hào, patients typically cannot be seen. It applies broadly across settings—from large public hospitals to small neighborhood clinics—and extends metaphorically to online health platforms, where users 'guà hào' for virtual consultations. While the characters suggest physical action, modern usage is entirely functional and bureaucratic, rooted in China’s structured healthcare system.