Assay

Vitamin D

Key Words

25-OH-Vitamin D2/3, Vit D, Total Vit D, cholecalciferol, ergocalciferol, VITD, VITDT

Specimen Collection

Serum (brown) only

Turnaround time

72hrs

Test Indications

Vitamin D is primarily requested for the investigation of metabolic bone disease. Other indications may in hyperparathyroidism, TB patients, individuals on anticonvulsant therapy, subjects on anti-retroviral therapy and those with CKD or nephrotic syndrome.

Limitations/Interferences

High levels of sample haemolysis interfere with the test and in such cases results are not reported.

High protein levels can cause non-reproducible false high vitamin D results.

Reference Range

< 30 nmol/l = “Vit D <30nmol/L indicates Vitamin D deficiency”

≥ 50 nmol/l =”Vit D >50nmol/L indicates adequate Vitamin D levels”

Analytical Error

6.5%

Reference Change Value 

N/A

Minimum retesting interval

Requests made within 90 days of a previous result on a patient are intervened