Driver's Mini Blood Test

Total cholesterol measures all cholesterol in your blood, combining HDL, LDL, and other fractions. While cholesterol is essential for cell membranes, hormone production, and vitamin D synthesis, elevated total cholesterol is associated with increased cardiovascular risk. However, the breakdown into HDL and LDL is more informative than total cholesterol alone—high total cholesterol driven by protective HDL is very different from high total cholesterol driven by harmful LDL. For drivers, cardiovascular health is particularly important given the sedentary nature of driving. Results outside the normal range may need a follow-up with your GP.

LDL (low-density lipoprotein) cholesterol is often called 'bad cholesterol' because elevated levels are strongly associated with atherosclerosis—the build-up of fatty plaques in arteries that underlies heart attacks and strokes. LDL particles transport cholesterol to tissues, but excess LDL can deposit cholesterol in artery walls, triggering inflammation and plaque formation. LDL is the primary target for cardiovascular risk reduction through both lifestyle changes (reducing saturated fat, increasing fibre, regular exercise, healthy weight) and medications like statins when needed. Results outside the normal range may need a follow-up with your GP.

Non-HDL cholesterol is calculated by subtracting protective HDL from total cholesterol, representing all potentially harmful cholesterol—LDL plus VLDL and other atherogenic particles. Many experts consider non-HDL a better cardiovascular risk marker than LDL alone because it captures the full atherogenic burden, particularly in people with elevated triglycerides (which is common with irregular eating patterns). The recommended target is below 4.0 mmol/L, with lower targets for those at higher cardiovascular risk. Non-HDL remains accurate regardless of fasting status. Results outside the normal range may need a follow-up with your GP.

HDL (high-density lipoprotein) cholesterol is called 'good cholesterol' because it performs reverse cholesterol transport—collecting excess cholesterol from tissues and artery walls and returning it to the liver for disposal. Higher HDL levels are protective against cardiovascular disease. Levels above 1.0 mmol/L in men and 1.2 mmol/L in women are generally desirable. Regular aerobic exercise is one of the most effective ways to raise HDL—something that can be challenging for drivers who spend long hours seated. Smoking lowers HDL, while moderate alcohol intake may raise it slightly. Results outside the normal range may need a follow-up with your GP.

The cholesterol: HDL ratio is calculated by dividing your total cholesterol by your HDL cholesterol level. This ratio provides insight into the proportion of your total cholesterol that is protective HDL versus potentially harmful LDL and other fractions. A lower ratio indicates a more favourable lipid profile. The ratio is used in cardiovascular risk assessment tools (such as QRISK) to help calculate your overall risk of having a heart attack or stroke over the next 10 years. An ideal ratio is below 4, with lower being better. A ratio above 6 indicates significantly increased cardiovascular risk. Results outside the normal range may need a follow-up with your GP.

Triglycerides are a type of fat (lipid) that circulate in your blood. After eating, your body converts excess calories (whether from fat, carbohydrate, or protein) into triglycerides, which are then transported to fat cells for storage. Elevated triglycerides are associated with increased cardiovascular risk, particularly when combined with low HDL cholesterol. High triglycerides are often linked to excess calorie intake, high sugar/refined carbohydrate consumption, alcohol, obesity, and poorly controlled diabetes. Irregular eating patterns—common in professional driving—can contribute to elevated triglycerides. The target is below 1.7 mmol/L; very high levels (above 10 mmol/L) can cause pancreatitis. Results outside the normal range may need a follow-up with your GP.

Vitamin D is essential for calcium absorption, bone health, muscle function, and immune system regulation. Despite being called a vitamin, it functions as a hormone and the body produces it when skin is exposed to UVB sunlight. However, in the UK, sun exposure is insufficient during autumn and winter months to produce adequate vitamin D, and vehicle glass blocks UVB rays entirely. Professional drivers who spend most of their day inside a vehicle are therefore at particular risk of vitamin D deficiency regardless of season—even on sunny days, sitting behind a windscreen provides no vitamin D benefit. Vitamin D deficiency can cause fatigue, muscle weakness, bone pain, and low mood—symptoms that can affect driving performance and quality of life. Levels below 25 nmol/L indicate deficiency; 25-50 nmol/L is insufficient; above 50 nmol/L is adequate; and above 75 nmol/L is considered optimal by many experts. Dietary sources (oily fish, eggs, fortified foods) provide only small amounts. For most UK adults, particularly those with limited sun exposure, supplementation is needed—typically 1000-2000 IU daily for maintenance, with higher doses potentially needed to correct deficiency. Results outside the normal range may need a follow-up with your GP.