Vitamin B12 and Folates


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Quest Diagnostics Test Code: 7065

Determining the level of Vitamin B12 in the blood is important because its deficiency can cause serious health issues. The human body can’t produce B12, so the diet is its only source

Vitamin B12 is part of the group of B vitamins which are water-soluble. Vitamin B12, along with folate are two vitamins which are required for the normal red blood cell production and formation, for repairing of tissues that get damaged as well as synthesis of DNA. Both of these substances cannot be produced in the body and require diet or other supplementation. Vitamin B12 is needed for the maintenance of healthy nerve function and folate is important in the cell and DNA division and repair for tissues and cells. Deficiency of these two vitamins can lead to macrocytic anaemia.

This test is performed in following conditions such as:

• Dizziness Pale skin
• Fatigue
• Rapid heart rate, irregular heartbeats
• Shortness of breath


Dietary supplements containing biotin (also known as vitamin B7 or B8, vitamin H, or coenzyme R) may interfere in assays and may skew results to be either falsely high or falsely low. For people receiving the recommended daily doses of biotin, draw samples at least 8 hours following the last biotin supplementation. For people on mega-doses of biotin supplements, draw samples at least 72 hours following the last biotin supplementation.


Specimen Collected
  • Blood
Estimated Time Taken

Turnaround for this test is typically 1 business day.