Blood Markers
8 min read
17 May 2026
Stop Guessing, Start Measuring: Becoming the Expert on Your Own Metabolic Health
The distinction between clinically normal and biologically optimal is one that conventional medicine rarely makes. It is precisely this distinction that determines whether you are moving towards long-term vitality or quietly accumulating metabolic risk.
Jon Bell
Metabolic Health Specialist · Leamington Spa
For decades, the standard model of preventative healthcare has been fundamentally passive. We attend an annual review, submit to a blood draw, and await a telephone call. If the results fall within the reference range, we are reassured and sent on our way. If they fall outside it, we are offered a prescription and, if we are fortunate, a brief conversation about lifestyle. This reactive model is failing adults in their forties and fifties on a significant scale.
The concept of a ‘normal’ blood result is far less reassuring than it sounds. Reference ranges are constructed from population averages, and in a population where metabolic dysfunction is increasingly prevalent, average is no longer a reliable proxy for healthy. The distinction between clinically normal and biologically optimal is one that conventional medicine rarely makes, and yet it is precisely this distinction that determines whether a person is moving towards long-term vitality or quietly accumulating metabolic risk.
The Markers That Actually Matter
The markers that matter extend well beyond the standard cholesterol and blood glucose panel. Understanding them transforms a passive annual review into a genuine tool for metabolic self-management.
- HbA1c: provides a three-month average of blood glucose, offering a meaningful window into metabolic trajectory. Optimal functional range is 31 to 36 mmol/mol, not simply 'below 42'
- Fasting insulin: rarely included in routine NHS panels, it is one of the most important early warning signals available. It can rise significantly years before blood glucose begins to climb, indicating insulin resistance long before a prediabetes diagnosis
- Triglyceride to HDL ratio: a powerful predictor of cardiovascular risk and insulin resistance. Below 1.0 (mmol/L) is associated with low risk; above 2.0 is a strong signal of metabolic dysfunction
- High-sensitivity C-reactive protein (hs-CRP): reveals the level of systemic inflammation that underlies so much chronic metabolic disease
Fasting insulin timing
Years ahead of glucose
Fasting insulin can rise significantly years before blood glucose leaves the normal range, providing a critical early warning of insulin resistance that standard NHS panels routinely miss.
The Women's Panel
For women, the picture is more complex still. A comprehensive thyroid panel, including TSH, free T3, free T4, and thyroid antibodies, is essential for understanding whether the metabolic engine is running as it should. Elevated thyroid antibodies may indicate Hashimoto’s thyroiditis years before TSH becomes abnormal, providing a critical window for intervention. Hormonal markers including FSH, LH, and oestradiol illuminate the stage of menopausal transition and inform decisions about lifestyle support. For those with suspected PMOS, testosterone, SHBG, and DHEA-S complete the hormonal picture.
The CGM Dimension
We are entering a period of extraordinary democratisation in health data. Continuous glucose monitors, once the exclusive preserve of insulin-dependent diabetics, are now accessible to anyone who wishes to understand their individual glycaemic response to food, exercise, stress, and sleep in real time. This immediate, personalised feedback transforms abstract health advice into concrete, actionable insight. A single annual HbA1c tells you the average. The CGM trace tells you the story behind it.
"When you understand your markers, you are no longer a passive recipient of healthcare. You are an informed, empowered participant in your own transformation."
Frequently Asked
The Markers That Actually Matter
The markers that matter extend well beyond the standard cholesterol and blood glucose panel. Understanding them transforms a passive annual review into a genuine tool for metabolic self-management.
The Women's Panel
For women, the picture is more complex still. A comprehensive thyroid panel, including TSH, free T3, free T4, and thyroid antibodies, is essential for understanding whether the metabolic engine is running as it should. Elevated thyroid antibodies may indicate Hashimoto’s thyroiditis years before TSH becomes abnormal, providing a critical window for intervention. Hormonal markers including FSH, LH, and oestradiol illuminate the stage of menopausal transition and inform decisions about lifestyle support. For those with suspected PMOS, testosterone, SHBG, and DHEA-S complete the hormonal picture.
The CGM Dimension
We are entering a period of extraordinary democratisation in health data. Continuous glucose monitors, once the exclusive preserve of insulin-dependent diabetics, are now accessible to anyone who wishes to understand their individual glycaemic response to food, exercise, stress, and sleep in real time. This immediate, personalised feedback transforms abstract health advice into concrete, actionable insight. A single annual HbA1c tells you the average. The CGM trace tells you the story behind it.