Vitamin D LCMS Test (D2 & D3)

### What LC-MS/MS measures that a standard test doesn't Standard vitamin D tests report a single combined figure. This test uses liquid chromatography-tandem mass spectrometry (LC-MS/MS) to measure 25-hydroxy vitamin D2 and 25-hydroxy vitamin D3 separately, alongside your total - the level of detail that matters if you supplement or want a precise baseline to track. Order online, no GP referral needed. LC-MS/MS is the reference method used to calibrate and standardise vitamin D measurement internationally. It identifies each form of vitamin D by its molecular signature rather than by antibody binding, which means it can tell D2 and D3 apart and is not affected by the supplement interferences that can affect other assay types. For most people, a standard vitamin D test answers the question. This one is for when the detail is the point. __Who this test is for__ - You take a vitamin D supplement and want to see whether it is actually moving your levels - You take a **D2 or vegan** supplement and want to confirm it is being absorbed - You have had inconsistent or borderline vitamin D results and want a precise measurement - You are building a detailed nutritional baseline and want reference-method accuracy - Your practitioner has asked for D2 and D3 reported separately Vitamin D results are information to interpret alongside your symptoms, sun exposure, diet and supplement history. We recommend working through them with your GP or practitioner.