Biochemistry
| Full details for "Vitamin D (25 OH) ". | |
|---|---|
Name |
Vitamin D (25 OH) |
Alternative name/Profile |
25-Hydroxy Vitamin D, Vit D, Vitamin D |
Department |
Biochemistry |
Investigation |
For investigation of vitamin D concentrations in blood |
Specimen type |
Serum |
Sample type |
|
Sample container & volume |
5ml - Red Tube |
Frequency of analysis |
Daily |
Turnaround time |
LCMS = 10 working days Immunoassay = 3 working days |
Availability |
Monday - Friday during core working hours. |
Notes |
From 04/11/2024 any GP ordering Vitamin D must submit the fully completed mandatory Vitamin D request form and a separate sample for this test. If these criteria are not met, Vitamin D will not be measured. A memo was issued on 29.10.24 with a copy of the request form, which is also available on the LabMed User Guide under GP forms Population-based Vitamin D testing is not recommended at present Vitamin D testing should be restricted to specific patient groups as outlined in the HSE Laboratory Services Reform Programme Advice Note (2024) - Indications for the measurement of Vitamin D levels. (See Related Links section) Minimum testing interval after supplementation - 3 months A fasting sample is not required Analysis is performed by LCMS for SJH patients/external hospitals and by Immunoassay for General Practitioners (Primary Care). Useful reference: Cavalier E et al. Clinical Chemistry 70:9 1104-1121 (2024)
|
Related links |
|
Reference range |
Concentration > 50 nmol/L (20 ng/ml) suggests normal Vit D status Concentration 30 - 50 nmol/L (12 - 20 ng/ml) suggests Vit D insufficiency. Concentration < 30 nmol/L (12 ng/ml) suggests Vitamin D deficiency A "risk" of vitamin D toxicity is defined as a 25(OH)D level >250 nmol/L (>100 ng/mL) in adults ingesting substantial amounts of calcium |
Last updated |
Thu, 31 Oct 2024 14:12:53 GMT |