Brain fog is usually investigated with a small group of blood tests for brain fog, including a full blood count, ferritin, vitamin B12 and folate, vitamin D, thyroid function and blood glucose. These tests can help identify some of the common, treatable causes of poor concentration, forgetfulness and mental fatigue.
What Causes Brain Fog?
Brain fog isn’t a diagnosis on its own. It’s a way of describing problems such as difficulty concentrating, forgetfulness or feeling mentally tired. Several things can contribute to it, including:
- Vitamin B12, folate or iron deficiency
- An underactive or overactive thyroid
- Low or unstable blood sugar
- Poor sleep, stress or chronic fatigue
- Perimenopause and menopause
- Certain medications or long-term conditions
Since several of these causes can produce similar symptoms, blood tests can help narrow down what may be behind the problem.
Which Blood Tests Can Identify the Cause of Brain Fog?
A GP or private clinic will usually consider several tests rather than looking for one specific cause. That’s because vitamin deficiencies, thyroid problems, and other conditions can cause similar changes in concentration and energy levels.
Blood Test for Memory Loss and Concentration
A blood test for memory loss typically checks vitamin B12 and folate first. According to the NHS, vitamin B12 deficiency can affect the brain and nervous system, causing memory lapses, low mood and poor concentration, and it’s usually confirmed with a simple blood sample.
Blood Test for Vitamin Deficiency
A blood test for vitamin deficiency looks at vitamin D and ferritin alongside B12 and folate, as more than one shortfall often overlaps. Per the NHS, iron deficiency reduces the healthy red blood cells that carry oxygen around the body, often showing up as tiredness and poor concentration.
Thyroid and Blood Sugar Tests
Thyroid function tests can measure TSH when checking for thyroid problems. An underactive thyroid can cause problems with memory and concentration, as well as tiredness.
An HbA1c or glucose test may also be used to look at blood sugar levels. These tests can help identify blood sugar problems that may be contributing to fatigue or other symptoms.
Why Choose a Private Blood Test
A private blood test can be a convenient option if you want to have certain tests without waiting for a routine GP appointment. Depending on the test, results may be available quickly, sometimes the next day.
- Convenient private blood tests for residents of Stoke Poges, Gerrards Cross and surrounding areas
- No lengthy referral process
- Confidential results with professional guidance
- A wider range of test panels to choose from
Find Out What Could Be Causing Your Brain Fog
If you’re experiencing ongoing problems with your energy, concentration or memory, finding out whether an underlying health issue could be contributing may be worthwhile.
Aroga Pharmacy offers private vitamin, thyroid and blood health tests to residents across Farnham Common, Slough, Burnham, Taplow and Gerrards Cross. Book your appointment today to arrange your blood test.
Frequently Asked Questions
What is the best blood test for brain fog?
There isn’t one single test. A combined panel checking vitamin B12, folate, ferritin, vitamin D, thyroid function and blood glucose covers the most common causes in one visit.
Can a blood test show why I have brain fog?
Yes, in most cases. Blood tests can identify deficiencies, thyroid imbalances and blood sugar issues that are known to cause brain fog, though results should always be discussed with a healthcare professional.
What vitamin deficiency causes brain fog?
Vitamin B12, folate, vitamin D and iron deficiencies are the most commonly linked to brain fog, fatigue and poor concentration.
How quickly will I get my private blood test results?
Private blood test results are typically available much faster than routine NHS turnaround times, often within a few days.
Can brain fog be caused by something other than a deficiency?
Yes. Thyroid conditions, blood sugar problems, menopause, poor sleep, stress, certain medicines and long-term health conditions can all contribute to symptoms described as brain fog. That’s why looking at more than one possible cause can be helpful.
Do I need a GP referral for a private blood test?
No. You can book a private blood test directly with Aroga Pharmacy without a GP referral and discuss your results with our team afterwards.