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Microbiology Sources | Microbiology Tests | Anatomic Pathology | Cytopathology

Vitamin D, 25 Hydroxy

Source Blood
Mnemonic VD
Specimen Requirements

1 x 3.5 mL gold top SST tube

1.0 mL serum 

Minimum Whole Blood Volumes for Micro-Collections using Microtainers
Specimen Handling Centrifuge specimen prior to transport to the DSC.
Additional Information Vitamin D reaches steady state within 3 months following a change in intake.
Testing Location Immunochemistry
Testing Frequency Weekdays
Alternate Name(s) Vitamin D3, 25-OH Vitamin D
Reference Interval SEVERE DEFICIENCY                           < 25 nmol/L
MODERATE TO MILD DEFICIENCY         25 - 80 nmol/L
OPTIMUM LEVELS                                80 - 200 nmol/L
TOXICITY POSSIBLE                            > 250 nmol/L