The Truth About Fatigue – Blood Tests That Can Help You Find the Cause
By Tharb Faisl
Always Tired? It’s Not “Just Life”. Fatigue is one of the most common complaints among adults – but it’s often brushed off as stress, parenting, or “just getting older.”
In reality, underlying medical issues may be silently zapping your energy. That’s why at Marylebone Diagnostic Centre; we offer detailed blood tests designed to investigate the root cause of chronic fatigue.
Book Your Fatigue Blood Test in London Today!
Blood Tests That Can Explain Fatigue
| Test | Why It Matters |
| Full Blood Count (FBC) | Screens for anaemia and infection |
| Ferritin & Iron Panel | Low iron = common cause of tiredness, especially in women |
| Vitamin B12 & Folate | Deficiencies can cause fatigue, brain fog, and mood issues |
| Vitamin D | Linked to low energy, muscle aches, and low mood |
| Thyroid Function (TSH & Free T4) | Underactive thyroid (hypothyroidism) = key fatigue driver |
| HbA1c & Glucose | High or fluctuating blood sugar impacts energy |
| Liver & Kidney Function | Rule out metabolic or detox issues |
| CRP & ESR (inflammatory markers) | Detect hidden inflammation contributing to fatigue |
These are available individually or as part of our Well Person XX (£199) or Marylebone Health Screening Profile (£229).
Book Your Fatigue Blood Test in London Today!
Fatigue Affects Everyone – But the Causes Vary
Tiredness can be caused by:
- Anaemia (especially common in menstruating women)
- Vitamin or mineral deficiencies
- Underactive thyroid
- Chronic inflammation
- Blood sugar instability
- Poor sleep or stress
- Post-viral or long-term recovery
You don’t need to guess – your blood will tell the truth.
Book Your Fatigue Blood Test in London Today!
Why Choose Marylebone Diagnostic Centre?
Fast, private blood testing in Central London
Same-day or next-day results
Near Baker Street, Harley Street, Paddington, and Euston
No GP referral needed
Clinical support and explanation of findings
Book Your Fatigue Blood Test in London Today!
What Our Patients Say
“I was convinced it was burnout. But my tests showed low B12 and borderline thyroid levels. I’m now on supplements and feel 100x better.”
Saira, 42, Marylebone
“I’d had blood tests before — but never this complete. Finally figured out why I always needed a nap by 2pm.”
– Leo, 35, Mayfair
Book Your Fatigue Blood Test in London Today!
FAQs – Fatigue Blood Tests
Don’t Let Fatigue Rule Your Life
Clear, science-backed answers
Test your energy at its source
Friendly, professional team
Trusted in Central London
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