A vitamin D (25-hydroxy)blood spot test. We will mail the kit to you, you collect the sample in the comfort of your own home and then send it back to the lab. We will email the results to you as soon as we have them (usually within 14 days of receiving the sample). You can ask your GP to test your vitamin D levels. This test suits those that would rather not have a full blood draw or are unable to visit their GP.