Red blood cell folate is a direct blood measure of the folate held inside red cells, reflecting intake over the previous three to four months. Practitioners use it for clients with restrictive diets, heavy alcohol use, malabsorption, pregnancy planning or folate-affecting medicines such as methotrexate. Assays vary more between labs than most tests, and B12 deficiency can lower the result independently of folate intake.
| Test type | Measured in a blood sample |
|---|---|
| Measurements required | Red blood cell folate only |
| Sample and collection | Blood draw at a collection centre |
| Preparation | No fasting is needed for this test. |
| Turnaround | About 5 to 10 business days |
| Available through | Vitamins & Trace Elements. Available in: Essential Nutrients Test. |
| Pricing | Price on sign-up |
| Results | Returned in the Vively practitioner platform, beside your client's other markers |
What are the Red blood cell folate reference and optimal ranges?
| Typical lab reference | Vively optimal | |
|---|---|---|
| Adults | 1426 to 3294 nmol/L | No separate optimal range |
RBC folate assays vary more between labs than most tests, so read the result against the range printed on the client's report (RCPA guidance) and compare trends from the same lab.
Check a client's Red blood cell folate result
Enter the value from your client's lab report to see where it sits against the typical lab range and the Vively optimal range.
A guide only, not a diagnosis. One result is a starting point: read it with symptoms, history and a repeat test. Labs differ, so check the result against the range on your client's report. Nothing you enter is stored or sent.
How do you arrange Red blood cell folate testing through Vively?
- Get verified. Practitioners with a recognised qualification or membership (ATMS, NHAA, ANTA, Dietitians Australia, NSA, CMA or Ahpra registration) can request free practitioner access.
- Choose a panel. Log in to the practitioner platform and pick a panel that includes Red blood cell folate, or build your own. Add-on pricing shows when you sign up.
- Client collects. Your client collects at a partner collection centre, with their request on their phone or printed.
- Review results. Results come back to you in the practitioner platform, beside your client's other markers, ready for the follow-up consult.
Which Vively panels include Red blood cell folate?
Log in to the practitioner platform to view a panel in full, or build and save your own from 100+ tests and panels.
- Essential Nutrients Test12 markers · NutrientsPrice on sign-upRed blood cell folateSeleniumVitamin DVitamin B12Red Blood Cell MagnesiumRed Blood Cell ZincRed Blood Cell CopperCaeruloplasmin+4 moreLog in to view this panel
How do you read Red blood cell folate without an optimal range?
RBC folate has no separate optimal range: deficiency has been uncommon since fortification, so a low result points to a specific cause.
Mandatory folic acid fortification of bread-making flour began in 2009, and deficiency is now uncommon in Australia (AIHW, 2016). Look for very low intake, heavy alcohol use, malabsorption, medication or B12 deficiency.
The World Health Organization suggests this for neural tube defect prevention in women who could become pregnant. It was set on a specific assay, so use it as a guide alongside the lab range.
Results above the range usually reflect supplements or fortified foods and carry no proven extra benefit.
What should Red blood cell folate be read with?
- LowLow RBC folate, high MCV
Possible folate deficiency affecting red cell production; check B12 before any folic acid is started.
- LowLow RBC folate with low B12 or holoTC
B12 deficiency stops cells retaining folate, so RBC folate can read low from B12 deficiency alone; B12 status needs sorting first through the GP.
- LowLow RBC folate with raised GGT and MCV
Often seen with regular heavy alcohol intake.
- LowLow RBC folate with low ferritin and low vitamin D
Raises the question of malabsorption, including coeliac disease.
- ContextRBC folate above the range
Usually reflects folic acid or methylfolate supplements or fortified foods; make sure B12 status is known.
What can affect a Red blood cell folate result?
- Slow to change: it reflects the past 3 to 4 months, so recent changes may not show yet
- B12 deficiency lowers RBC folate independently of folate intake
- A blood transfusion in the past three months means the result partly reflects donor cells
- Methotrexate, sulfasalazine and some anticonvulsants such as phenytoin affect folate absorption or metabolism
- Wide between-lab variation, including how labs correct for haematocrit
When should you refer the client to their GP?
- Below the lab range, particularly with high MCV, low haemoglobin, mouth ulcers or marked fatigue
- Low folate with low or borderline B12: GP review before folic acid, as it can correct the anaemia while B12-related nerve damage progresses
- Clients planning pregnancy or pregnant, especially with diabetes, obesity, epilepsy medication or a previous neural tube defect pregnancy: folic acid decisions sit with the GP
- Clients on methotrexate or anticonvulsants with low results
How should a client prepare for a Red blood cell folate test?
Copy or print this to send to your client.
Preparing for your Red blood cell folate test
- No fasting is needed for this test.
- Tell your practitioner if you take folic acid or methylfolate, including in a multivitamin or pregnancy supplement.
- Also mention any blood transfusion in the past three months, and if you take methotrexate or anticonvulsant (epilepsy) medicines.
- Take your pathology request to any of 4,000+ collection centres. Bring it printed or on your phone.
- Keep taking prescribed medicines as usual unless your doctor tells you otherwise.
- Results usually take about 5 to 10 business days and come to your practitioner. Book your results appointment for after that.
How do practitioners use Red blood cell folate with clients?
Pair RBC folate with B12 or holoTC every time, because the two deficiencies look alike on a blood count and the order of correction matters. A low result in a client who eats bread and vegetables is a prompt to ask about alcohol, absorption and medication, since fortification makes low intake a less common cause.
Red blood cell folate FAQs
Can a naturopath, nutritionist or dietitian order RBC folate through Vively?
Yes. Add it to any client panel on the Vively practitioner platform. It sits in Vitamins & Trace Elements and is also in Essential Nutrients Test. Add-on pricing shows when you sign up. No account yet? Request free access.
Should I order serum folate or RBC folate?
RBC folate, when you want longer-term status. Serum folate moves with the last few days of intake, so one low value can reflect a poor week. RBC folate integrates the past three to four months, which suits dietary assessment and tracking. Its weakness is wider lab-to-lab variation, so keep repeat tests at the same lab.
How soon will RBC folate rise after a diet change?
Gradually, over about three to four months. Red cells take up folate while they are being made, so the average rises as older cells are replaced. Retesting before 12 weeks usually understates the change. If you need an earlier check that intake has improved, serum folate responds within days.
Why is RBC folate low in a client who eats bread and vegetables?
Mandatory folic acid fortification of bread-making flour since 2009 has made low intake an uncommon cause. Look instead at alcohol, malabsorption, medications such as methotrexate or phenytoin, and B12 deficiency, which stops cells retaining folate. Check B12 or holoTC and GGT on the same work-up, and ask about the client's medicines.
How should I use the 906 nmol/L figure for a client planning pregnancy?
Treat it as a guide, not a pass mark. The World Health Organization suggests an RBC folate above 906 nmol/L in women of reproductive age for neural tube defect prevention, but that threshold was set on a specific assay. Read it alongside the lab range on the report. Folic acid decisions for pregnancy sit with the client's GP.
References
- Royal College of Pathologists of Australasia. RCPA Manual: Folate (red cell).
- World Health Organization. Guideline: optimal serum and red blood cell folate concentrations in women of reproductive age for prevention of neural tube defects. 2015. Source
- Australian Institute of Health and Welfare. Monitoring the health impacts of mandatory folic acid and iodine fortification. 2016. Source
- Devalia V, Hamilton MS, Molloy AM. Guidelines for the diagnosis and treatment of cobalamin and folate disorders. British Journal of Haematology. 2014.