What is the Folate (Vitamin B9) Test?

The Folate (Vitamin B9) test measures the level of folate in the blood, an essential B vitamin required for DNA synthesis, red blood cell formation and normal nervous system function. Folate plays a critical role in cell division and tissue growth, making it particularly important during periods of rapid growth such as pregnancy.

Low folate levels can impair red blood cell production, leading to megaloblastic anaemia, and may contribute to neurological symptoms and cardiovascular risk through elevated homocysteine levels. The test is commonly used to assess nutritional status and investigate unexplained anaemia or fatigue.

Why do I need a test for Folate (Vitamin B9)?

You may need this test if you have symptoms suggestive of folate deficiency or if routine blood tests show anaemia with enlarged red blood cells. Folate deficiency can develop due to inadequate dietary intake, malabsorption, increased requirements or certain medications.

Testing is also important in pregnancy planning and monitoring, as adequate folate levels are essential for fetal neural tube development. Identifying deficiency early allows timely dietary advice or supplementation to prevent complications.

Symptoms and scenarios where testing is recommended:

• Fatigue or weakness
• Anaemia or abnormal red blood cell indices
• Shortness of breath
• Memory or concentration difficulties
• Numbness or tingling
• Poor dietary intake
• Gastrointestinal malabsorption disorders
• Pregnancy planning or early pregnancy

Benefits of the Folate (Vitamin B9) Test

• Detects folate deficiency
  Identifies low levels before severe symptoms develop.
• Supports anaemia investigation
  Helps distinguish folate deficiency from other causes.
• Assesses nutritional status
  Provides insight into dietary adequacy.
• Supports neurological health assessment
  Low folate may affect cognitive and nerve function.
• Important for pregnancy health
  Ensures adequate levels for fetal development.
• Helps manage elevated homocysteine
  Supports cardiovascular risk assessment.
• Guides supplementation decisions
  Enables targeted treatment and monitoring.
• Simple and reliable blood test
  Requires only a standard blood sample.

Step-by-Step: How Testing Works

Choose your preferred testing method

You can attend one of our UK partner clinics or arrange a home or hotel visit with a mobile phlebotomist.

Option 1 – In-Clinic Blood Draw

1. Select your nearest UK clinic and book an appointment.
2. A clinician or phlebotomist collects a venous blood sample.
3. The sample is analysed for folate levels.
4. Results are delivered securely online.

Option 2 – Home or Hotel Phlebotomy (+£60)

1. Book a UK-wide home or hotel visit at a convenient time.
2. A trained phlebotomist collects your blood sample on-site.
3. The sample is transported to the laboratory.
4. Results are uploaded digitally without the need to travel.

Your Results Explained

Low Levels

Low folate levels indicate deficiency.
This may lead to megaloblastic anaemia, fatigue and neurological symptoms.
Typical UK reference range: ~7–45 nmol/L (ranges may vary by laboratory).

Normal Levels

Normal folate levels suggest adequate vitamin B9 status.
This supports healthy red blood cell production and nervous system function.

High Levels

High folate levels are usually due to supplementation.
They are generally not harmful but should be interpreted alongside vitamin B12 levels.