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Why Am I So Tired? Blood Test

Price range: £99.00 through £250.00

Tiredness that won’t shift, low energy, brain fog — these are common complaints, but they don’t always have an obvious cause. This test checks a broad range of markers that are frequently linked to fatigue, giving you a clearer picture of what might be going on beneath the surface.

Using the Tasso device — which attaches to your upper arm and requires no finger-prick — you collect a small blood sample at home and post it to our UK-certified laboratory. Your results are delivered digitally as a clear, easy-to-read wellness report.

Choose the level of insight that suits you:

Quick Energy Check A focused check of the most common fatigue-related markers: Vitamin D, Vitamin B12, Ferritin and TSH.

Why Am I So Tired? (Most Popular — Intro Price, usually £199) Everything in the Quick Energy Check, plus Iron, Total Iron Binding Capacity, Folate, Free T4, CRP, Magnesium, Albumin, Urea, Creatinine and ALT.

Deep Dive: Why You’re Still Tired Everything in the core test, plus Testosterone, SHBG and Cortisol — for a more advanced look at hormonal and adrenal factors that can contribute to persistent fatigue.

This is a wellness test and is not intended to diagnose or treat any medical condition.

Test Level

Clear

SKU: WAIST Category: Blood & Biomarker Tests

Details

Identify the most common biological causes of fatigue, low energy and brain fog with a simple at-home blood test — no finger-prick, no clinic visit required.

Frequently asked questions

No. The kit includes a Tasso device, which attaches to your upper arm and collects a small blood sample using gentle suction. Most people find it virtually painless, and the whole process takes around five minutes.

Once your sample reaches our UK laboratory, results are typically ready within a few working days. You'll receive them digitally as a clear, easy-to-read wellness report. We recommend posting your sample on a weekday morning for the quickest turnaround.

The Quick Energy Check covers the most common markers associated with tiredness and is a good starting point. The Why Am I So Tired? test is our most popular option and looks at a much broader range of fatigue-related markers. The Deep Dive adds hormonal markers including cortisol and testosterone — worth considering if you've already checked the basics but still can't pinpoint the cause of your fatigue.

It will show you how your key energy-related markers are looking, which can be a useful starting point for understanding your fatigue. It's a wellness test rather than a diagnostic tool, so if your results raise any concerns we'd always recommend discussing them with your GP or a qualified health professional.

Your sample is analysed by a certified UK laboratory using the same methods used in clinical settings. The Tasso collection device is designed to produce reliable, high-quality samples without the need for a venous blood draw

Yes, though certain supplements — particularly high-dose Vitamin D, B12 or iron — can influence your results. For the most accurate picture, collect your sample before taking your supplements for the day. If you're on prescribed medication, we'd recommend speaking to your GP before making any changes based on your results.

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