Notification of Assay Change: Vitamin D
We are changing our Vitamin D method to the Abbott Total 25OH-Vitamin D method from Monday 16th January 2017. This is to allow us to process more rapidly the very large number of requests for vitamin D.
Reference ranges and specimen requirements will not change.
The circulating form of vitamin D is hydroxylated colecalciferol (vitamin D3). Most patients with vitamin D deficiency are also treated with vitamin D3, but a small number of patients are given ergocalciferol (vitamin D2) instead. Since the Abbott method cannot detect vitamin D2 in equimolar concentrations (up to 50% under-recovery), those given ergocalciferol will require their serum vitamin D levels to be measured using the mass spectroscopy method.
The mass spectrometry method can be requested for patients on D2 using ICE requesting. If ICE requesting is not available, please use the clinical details section to document this or alternatively request “VITDMS” in the tests request section.
All paediatric samples will be run on the mass spectrometer due to the smaller sample volume requirements on this method.
The new abbott Vitamin D assay is awaiting accreditation and will be assessed by UKAS against ISO 15189 standards at our next annual inspection.
For further information about vitamin D and the methods we offer please visit the test database. If you have any queries relating to this notice, please do not hesitate to contact us: Duty Biochemist: 0121 424 2000 (Bleep 2506)