Why is blood drawn for a driver's license test?

[SanRuth]

Blood tests are not required for the physical examination when obtaining a driver's license. Below are some relevant additional details: 1. The main items of the physical examination include: height, weight, blood pressure, pulse, vision (naked eye and corrected vision), hearing, color vision, diseases that hinder driving, and physiological defects that hinder driving. 2. Physical conditions required for applying for a motor vehicle driver's license: For applying for large passenger vehicles, tractors, city buses, large trucks, and trolleybuses, the height must be above 155 cm; for applying for medium-sized passenger vehicles, the height must be above 150 cm; no red-green color blindness; ability to distinguish the direction of sound sources with each ear at 500mm from a tuning fork; no motor dysfunction; both thumbs must be intact, and each hand must have three other fingers intact with normal limb and finger motor function; both lower limbs must be intact with normal motor function, and the length difference must not exceed 50mm.