Health Optimisation · Blood Testing

"Your results are normal." — but are you actually well?

There's a critical difference between being disease-free and being truly healthy. Your blood test results reveal one. Here's what they're not telling you about the other.

When your doctor says your blood results are normal, that's genuinely useful information — it means you're not flagging for disease. But here's what most people don't realise: those reference ranges were calculated from population averages. That means they include people who are sedentary, overweight, stressed, and nutrient-depleted.

The system isn't broken. It's designed to catch disease — not to optimise health. Those are two completely different jobs.

The B12 example

You could be at 200 — and told you're completely fine

Vitamin B12 is one of the clearest examples of this gap. Someone sitting at 200 pg/mL falls inside the NHS reference range. They're told their results are normal. Meanwhile they have brain fog, anxiety, poor memory, and tingling in their hands and feet — all classic B12 deficiency symptoms — and nobody connects the dots.

Classic symptoms of suboptimal B12 — all of which can appear even when results fall within the NHS reference range.

Visual comparison

B12: what the ranges actually look like

Key markers — NHS vs optimal ranges

Where the gap really shows up

B12 isn't the exception — it's the rule. The same gap exists for vitamin D, ferritin, magnesium, thyroid markers, and testosterone. Almost every key marker your body relies on has a 'normal' range that has nothing to do with feeling well, having energy, thinking clearly, or maintaining a healthy weight.

What this means for you

Two different jobs, two different standards

Your GP is brilliant at catching disease. Standard NHS panels are designed to flag things that need immediate treatment. They are not designed to tell you whether you have energy, think clearly, sleep well, or maintain a healthy weight.

Private blood testing looks at optimal ranges — not just population averages. It looks at markers that most standard panels skip entirely. And it builds a personalised picture of what your body specifically needs — not what the average person needs.

This content is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional regarding your health and before making any changes based on blood test results.