Vitamin B12 CPT: 82607
This test may exhibit interference when sample is collected from a person who is consuming a supplement with a high dose of biotin (also termed as vitamin B7 or B8, vitamin H, or coenzyme R). It is recommended to ask all patients who may be indicated for this test about biotin supplementation. Patients should be cautioned to stop biotin consumption at least 72 hours prior to the collection of a sample.
Expected Turnaround Time
Within 1 day
Turnaround time is defined as the usual number of days from the date of pickup of a specimen for testing to when the result is released to the ordering provider. In some cases, additional time should be allowed for additional confirmatory or additional reflex tests. Testing schedules may vary.
0.3 mL (Note: This volume does not allow for repeat testing.)
Red-top tube or gel-barrier tube.
If a red-top tube is used, transfer separated serum to a plastic transport tube.
To help diagnose one cause of anemia or neuropathy; to evaluate nutritional status in some people; to monitor the effectiveness of treatment for vitamin B12 or folate deficiency.
When you have abnormal results on a complete blood count (CBC) with a blood smear showing large red blood cells (macrocytosis) or abnormal (hypersegmented) neutrophils; when you have symptoms of anemia (weakness, tiredness, pale skin) and/or of neuropathy (tingling or itching sensations, eye twitching, memory loss, altered mental status); when you are being treated for vitamin B12 or folate deficiency.
A blood sample drawn from a vein in your arm.
Biotin found in certain dietary supplements may interfere with testing. Certain medicines, such as cholchicine, neomycin, para-aminosalicylic acid, and phenytoin, may affect the test results; your healthcare provider will advise you on which ones to stop taking. Ask your healthcare practitioner or lab for specific instructions.