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Folic acid, vitamin B9.

Common Use:
To assist in evaluation of diagnoses that are related to fluctuations in folate levels such as vitamin B12 deficiency and malabsorption.

Serum collected in a gold-, red-, or red/gray-top tube.

Normal Findings:
(Method: Immunochemiluminometric assay [ICMA])

Conventional UnitsSI Units (Conventional Units × 2.265)
NormalGreater than 5.4 ng/mLGreater than 12.2 nmol/L
Intermediate3.4–5.4 ng/mL7.7–12.2 nmol/L
DeficientLess than 3.4 ng/mLLess than 7.7 nmol/L
Values may be slightly decreased in older adults due to the effects of medications and the presence of multiple chronic or acute diseases with or without muted symptoms.

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