Folate, RBC
Use
The RBC folate test is used to determine folate deficiency and may be preferred over serum folate due to more stable levels in red blood cells, particularly in cases of nutritional deficiency, megaloblastic anemia, malabsorptive disorders, or pregnancy. It includes measurement of RBC folate and hematocrit, and may better reflect longer‑term folate status. This particular test has been discontinued by LabCorp as of January 7, 2026. ([wakemed.org](https://www.wakemed.org/for-providers/refer-to-us/pathology/tests/folate-rbc?utm_source=openai))
Special Instructions
The test includes RBC folate and hematocrit. Patients should discontinue any supplements containing biotin for at least 72 hours prior to specimen collection due to potential assay interference. ([dhalab.com](https://www.dhalab.com/shop/folate-rbc/?utm_source=openai))
Limitations
The red blood cell folate test does not offer significant clinical advantages over serum folate testing in most circumstances. The test has been discontinued by LabCorp, and providers are recommended to use Folate, serum (test code FOLAT) unless RBC folate is specifically required. ([wakemed.org](https://www.wakemed.org/for-providers/refer-to-us/pathology/tests/folate-rbc?utm_source=openai))
Methodology
Not provided.
Biomarkers
Result Turnaround Time
Not provided.
Related Documents
For more information, please review the documents below
Specimen
Whole Blood
Volume
Not provided
Minimum Volume
Not provided