Vitamin D

Vitamin D is a laboratory test in the Vitamins category. The information below is educational and is not a substitute for professional medical advice.

• Vitamin D is used as part of vitamins assessment.
• The specific analyte and methodology depend on the laboratory performing the test.

• May be ordered as part of a vitamins evaluation.
• Ordering decisions depend on individual health history, symptoms, and risk factors.

• Results are typically reported with a value and a reference range.
• Units and reporting conventions depend on the laboratory.

• Reference ranges vary by laboratory and population.
• Ranges should always be interpreted in the context of individual health history.

• Fasting status, medications, and timing of the draw can affect results.
• Underlying health conditions may also influence interpretation.

• Related tests depend on the clinical question being evaluated.
• A clinician can explain which additional tests may be informative.

• What does my result mean in the context of my health history?
• Are any follow-up tests appropriate?
• What could have affected my result?
• When should I be retested?