Folate test

What is being tested?

Folate is an important nutrient for making red blood cells and for repairing cells and nerve tissue in your body.

A folate blood test checks if you have enough folate.

This test examines levels of folate in your:

• blood (serum folate)
• red blood cells (RBC folate)

Usually, this test also checks for levels of vitamin B12 in your blood. This vitamin, also known as cobalamin, plays very similar roles to folate in your body.

Why would I need this test?

There are many reasons you might need a folate blood test.

Low folate levels can:

• stop your body from producing enough red blood cells (anaemia).
• prevent your red blood cells from developing normally
• cause nerve damage

If you have symptoms of anaemia or neuropathy (pain, weakness, numbness or tingling) you may need a folate blood test.

You might also have this test if you are having treatment for low folate or low vitamin B12. This is so your doctor can check how well your treatment is working.

How to prepare for this test

You might be asked to fast for 6 to 8 hours before the blood test is taken.

Understanding your results

There are many possible reasons for a low folate level.

• You might not be getting enough folate from your diet.
• Your body might not be absorbing folate from the food you eat.
• Your body might be losing folate due to a medicine you take.
• Your body might be losing folate due to a liver or kidney condition.
• You might need more folate than usual, such as if you’re pregnant.

You should discuss your results with your doctor. They can help you understand what they mean for you.