An economical method to obtain periodic testing of your 25-DThe vitamin D metabolite widely (and erroneously) considered best indicator of vitamin D "deficiency." Inactivates the Vitamin D Nuclear Receptor. Produced by hydroxylation of vitamin D3 in the liver. levels is to use a home test kit. Results seem to be fairly reliable when shipping times to the lab are normal.
Due to it's popularity, 25-D tests are now offered by a number of sites online. You will likely want to check around for the best price prior to ordering a kit. The following table offers a sample of sites and prices available.1)
| Site | Lab | Test | Price |
|---|---|---|---|
| ZRTlab.com | ZRT Laboratory | item no longer appears | removed |
| canaryclub.org | ZRT Laboratory | Vitamin D, 25-OH, Total | $65.00 (USD) |
| directlabs.com | LabCorp | Vitamin D, 25 Hydroxy | $59.00 (USD)2) |
| vitamind3uk.com | ZRT Laboratory | Home Test for Vitamin D3 Levels | £54.00 |
| vitamindtest.org.uk | Sandwell and West Birmingham Hospitals | 25-hydroxy Vitamin D2 and D3 | £25.00 |
Many local draws are shipped some distance to the analyzing lab. Some patients have shipped samples overseas. One patient reported that a result from a sample shipped overseas was a lower value than the result from the same draw given to a local lab. This may be related to the length of time in shipment or environmental conditions during shipment.