How to read my vitamin D results in my blood test results? Also, is vitamin D 3000-4000 units a day safe for older adults that are in heart medication and other meds -
How many days does it usually take for vitamin D test results to come in? My results were given to me the same day of the blood drawn. I'm a little concerned
![Analysis of vitamin D level among asymptomatic and critically ill COVID-19 patients and its correlation with inflammatory markers | Scientific Reports Analysis of vitamin D level among asymptomatic and critically ill COVID-19 patients and its correlation with inflammatory markers | Scientific Reports](https://media.springernature.com/full/springer-static/image/art%3A10.1038%2Fs41598-020-77093-z/MediaObjects/41598_2020_77093_Fig1_HTML.png)