A vitamin D test is a blood test that measures the level of vitamin D (calciferol) in your blood. It can indicate whether the vitamin D levels in your body are low or high. Low vitamin D levels ...

If you’re at risk of vitamin D deficiency or are worried about your levels, an at-home test may be a good first step. Here, we explain how the hydroxy-25 vitamin D test works, who should use it ...

Doctors use the 25-hydroxy vitamin D test to monitor your vitamin D levels. Low levels can mean you need to spend more time outdoors or adjust your diet. But it can also occur with certain medical ...

Students are placed into English levels by TOEFL or IELTS scores. Students also have the option to take the RIT English Language Exam if you’d like a chance to change ... according to test results.