Blood Tests for Fatigue and Low Energy

A doctor-led blood test for fatigue at our Chelsea clinic identifies the medical cause of persistent tiredness, brain fog and low energy. Every fatigue blood test London patients book here is interpreted personally by a GMC-registered clinician.

What causes fatigue?

• Iron deficiency and low ferritin (even with normal haemoglobin)
• Vitamin B12, folate and vitamin D deficiency
• Thyroid dysfunction — both under- and over-active
• Hormonal imbalance — low testosterone, perimenopause, adrenal patterns
• Insulin resistance and early metabolic dysfunction
• Chronic inflammation and post-viral states

What we test

Full blood count, iron studies and ferritin, full thyroid panel including antibodies, vitamin D, B12 and folate, magnesium and zinc, HbA1c and fasting insulin, hsCRP, cortisol, and a hormone profile tailored to sex and life stage.

Treatment

Once the cause is clear, treatment can begin promptly — whether nutritional correction, IV therapy, hormone optimisation or onward referral.

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