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|≤4 years||Not established|
|5-9 years||>7.1 ng/mL|
|10-17 years||>8.0 ng/mL|
|≥18 years||Low: <3.4 ng/mL|
|Borderline: 3.4-5.4 ng/mL|
|Normal: >5.4 ng/mL|
Folic acid deficiency is common in pregnant women, alcoholics, in patients whose diets do not include raw fruits and vegetables, and in people with structural damage to the small intestine. The most reliable and direct method of diagnosing folate deficiency is the determination of folate levels in both erythrocytes and serum. Low folic acid levels, however, can also be the result of a primary vitamin B12 deficiency that decreases the ability of cells to take up folic acid.
To view specimen requirements and codes please Select a regional laboratory.
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Reference ranges are provided as general guidance only. To interpret test results use the reference range in the laboratory report.
The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.
* The tests listed by specialist are a select group of tests offered. For a complete list of Quest Diagnostics tests, please refer to our Directory of Services.