Folate
Test Overview
The Folate (Folic Acid) test measures the level of folate (vitamin B9) in the blood, which is essential for DNA synthesis, red blood cell production, and proper nervous system function. Low folate levels can lead to anemia, birth defects, and neurological issues, while high levels may indicate excess supplementation or certain medical conditions.
Test Uses
- Diagnose folate deficiency, which can cause megaloblastic anemia.
- Monitor folate levels in pregnancy, as low folate can lead to neural tube defects.
- Evaluate nutritional status, especially in malabsorption disorders (e.g., celiac disease, Crohn’s disease).
- Assess folate levels in individuals with chronic alcoholism or poor diet.
Folate Test Results & Ranges
| Test Component: | Normal Range: | Abnormal (Possible Conditions): |
|---|---|---|
| Serum Folate | >3.4 ng/mL | Low (<3.4 ng/mL): Possible folate deficiency, anemia, malabsorption, pregnancy complications. High (>20 ng/mL): Possible excess folic acid intake, liver disease, or vitamin B12 deficiency masking anemia. |
| RBC Folate | >150 ng/mL | Low: Suggests long-term folate deficiency affecting red blood cells. |
- Serum Folate reflects recent folate intake and short-term levels.
- RBC Folate gives a long-term status of folate stores in the body.
Expected Turnaround Time
- Results Available: Typically within 24 – 48 hours.
Specimen Requirements
- Sample Type: Blood sample (venipuncture).
- Container: Serum separator tube (SST, gold or red-top tube).
Collection Instructions
- Fasting: May be required (6–8 hours) to avoid dietary influence on results.
- Avoid alcohol before testing, as it can interfere with folate absorption.
- If taking folic acid supplements, consult a healthcare provider about possible effects on results.
Test Details
Clinical Use: Essential for red blood cell production and DNA synthesis. Folate deficiency can cause megaloblastic anemia, which results in fatigue, weakness, and neurological symptoms. During pregnancy, low folate levels can lead to neural tube defects in newborns.
Limitations: Serum folate fluctuates with recent diet, so RBC folate may be a better indicator of long-term folate status. High folate levels may mask a vitamin B12 deficiency, potentially leading to neurological damage if left untreated.
The Folate test is crucial for assessing nutritional status, diagnosing anemia, and ensuring proper fetal development during pregnancy.