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PLEASE NOTE: Recent changes have been made to this Test


 Recent changes for 25-Hydroxyvitamin D

Recent changes for 25-Hydroxyvitamin D
DateFieldChanged FromChanged To
23rd May 2020
Preferred Specimen Type

Serum

Plasma

Optional Specimen Type

Serum

Preferred Container Type

SST

Lithium Heparin (with Gel)

Optional Container Type

SST

Collection & Request Instructions

Retrospective Add- Ons - MUST be a Serum (gold topped tube) and can only be added on retrospectively if collected in previous 24 hr period.

Frequency

Twice weekly

Daily

25-Hydroxyvitamin D

Alternative Names:Vitamin D
Vitamin D3
Vitamin D -25(OH)
Laboratory:Clinical Biochemistry
Test Code:25OHVITD
Specimen Types:Plasma
Serum
Container Types:
Lithium Heparin (with Gel)
SST
Transport Instructions between Sites and/or Laboratories:Room Temperature
Assay Frequency:Daily
Additional Notes:

Reference Intervals;

Vitamin D adequacy: > 50 nmol/L at the end of winter (level may need to be 10–20 nmol/L higher at the end of summer, to allow for seasonal decrease).

• Mild vitamin D deficiency: 30–49 nmol/L

• Moderate vitamin deficiency: 12.5–29 nmol/L

• Severe vitamin D deficiency: < 12.5 nmol/L

 

(Ref: Med J Aust 2012; 196 (11): 686-687)

Note: > 250 nmol/L can be associated with toxicity and hypercalcemia.