The 25-hydroxy vitamin D test (aka: 25(OH)D test) is not part of a lipid panel, comprehensive (nor standard) metabolic panel, or any number of tests I have regularly. Without a specific request, it's unlikely anyone gets tested for this unless maybe you're a psychiatric patient. When I had severe depression in my 20s, a doctor did have this test done.

All of my doctors (due to moves, retirements, etc) have done this for years in the US.

When the topic came up recently at a get together everyone could recall their relative Vitamin D levels (too low, normal) from recent checkups.

It’s common, at least in the US areas where I’ve lived.

It's surprising because so many people are deficient and the treatment is extremely cheap. It's bizarre, it's like if a problem is a big enough problem, medicine says well most people are living with it and washes its hands.

People in particular groups with higher risk of deficiency will be tested every year by many doctors. That practice obviously can't amount to testing every year being the average though.