Simple survey could replace millions of vitamin d blood tests

This study aimed to create a simple questionnaire that predicts whether someone has low vitamin D levels, without needing a blood test. Researchers collected information from over 2,500 adults about their sun exposure, diet, and health factors, then compared it to their actual vitamin D blood levels. The goal was to develop a tool that could help doctors identify who really needs a vitamin D blood test, potentially saving healthcare costs and reducing unnecessary testing.