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Vitamin D, 25-Hydroxy Testing

Sample Report
Specimen Type: Blood


This test is used to measure the level of Vitamin D in the blood.  Vitamin D is necessary for the proper growth and health of teeth and bones.  It also helps in the healthy developments of the immune system as well as various tissues throughout the body.  Vitamin D typically comes from 2 sources.  D3 (cholecalciferol) is produced by the body when the skin is exposed to sunlight.  For many people, D3 makes up the majority of the vitamin D in their body.  D2 (ergocalciferol) is found in certain foods as well as vitamins and supplements.  This test provides a combined measurement for D2 and D3.

Vitamin D deficiency is typically caused by someone not getting enough sun exposure.  While Vitamin D is found in some foods such as fatty fish, egg yolks, milk and cheese, the majority of people do not get sufficient vitamin D from their diet so exposure to sunlight is the primary source.  Symptoms of vitamin D deficiency can include tiredness, weakness, aches and pains and frequent infections.  Conditions such as Cystic Fibrosis and Crohn Disease which interfere with the body's ability to absorb fat and fat soluble vitamins can also cause vitamin D deficiency.

This test is typically ordered when someone had signs of vitamin D deficiency which can include conditions affecting the bones such as Rickets or Osteoporosis.   

Customers may also order a Vitamin D, 1, 25-Dihydroxy Test which can aid in the diagnosis of conditions which cuase excessive vitamin D production.

Turnaround time for this Vitamin D blood test is typically 1-3 business days.

Note: Result turn around times are an estimate and are not guaranteed. Our reference lab may need additional time due to weather, holidays, confirmation/repeat testing, or equipment maintenance.


This Vitamin D, 25-Hydroxy test has no fasting requirements.



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