Unless there are some clear symptoms of deficiency, vitamin D or testosterone tests aren't usually justified from an evidence based medicine perspective. Insurance companies usually won't cover such tests unless the patient meets their medical necessity criteria. However in many countries you can order such lab tests yourself and pay for them out of pocket.

As a separate issue, there is now significant clinical evidence that hypovitaminosis D is a major risk factor for COVID-19. So I hope that medical guidelines will be updated to make those tests a routine part of preventive care screening, in the same way that we test for lipids and blood glucose levels.

https://vitamin-d-covid.shotwell.ca/