Total Cholesterol / HDL Cholesterol Ratio

A composite cardiovascular risk indicator.

What it is

Your total cholesterol is a measure of all the cholesterol in your blood. Cholesterol is a fatty substance that your body needs to build healthy cells. It travels around your body in your blood, carried by proteins. These proteins and cholesterol together are called lipoproteins.

There are two main types of lipoproteins that carry cholesterol:

• Low-density lipoprotein (LDL) cholesterol: Often called 'bad' cholesterol. If you have too much LDL cholesterol, it can build up in the walls of your arteries, making them narrower and harder. This is called atherosclerosis.
• High-density lipoprotein (HDL) cholesterol: Often called 'good' cholesterol. HDL cholesterol helps to remove excess cholesterol from your arteries and take it back to your liver, where it can be broken down.

HDL cholesterol is therefore considered protective against heart disease.

The Total Cholesterol / HDL Cholesterol Ratio is a calculation that compares your total cholesterol level to your HDL cholesterol level. It's a way of looking at your cholesterol picture as a whole, taking into account both the 'bad' and 'good' types. A lower ratio generally suggests a lower risk of heart and blood vessel problems.

Why it matters

This ratio is considered a useful indicator of your risk of developing cardiovascular disease, which includes conditions like heart attacks and strokes. While looking at total cholesterol alone can be helpful, it doesn't tell the whole story. For example, someone might have a high total cholesterol, but if a large proportion of that is HDL cholesterol, their risk might not be as high as someone with the same total cholesterol but much lower HDL.

By comparing your total cholesterol to your HDL cholesterol, this ratio provides a more nuanced view of your cardiovascular health. A higher ratio can suggest that you have a greater proportion of 'bad' cholesterol relative to 'good' cholesterol, which can contribute to the build-up of fatty plaques in your arteries. This build-up can narrow the arteries, making it harder for blood to flow and increasing the chance of blockages that can lead to heart attacks or strokes.

What can cause it to be high or low

Several factors can influence your Total Cholesterol / HDL Cholesterol Ratio:

Factors that may lead to a higher ratio (less favourable):

• Genetics: Some people naturally have higher cholesterol levels or lower HDL levels due to their inherited genes.
• Diet: A diet high in saturated and trans fats, found in many processed foods, fatty meats, and full-fat dairy products, can raise total cholesterol and lower HDL.
• Weight: Being overweight or obese can negatively affect cholesterol levels, often leading to higher total cholesterol and lower HDL.
• Lack of physical activity: Regular exercise can help raise HDL cholesterol and lower LDL cholesterol. A sedentary lifestyle can have the opposite effect.
• Smoking: Smoking can lower HDL cholesterol levels, contributing to a less favourable ratio.
• Age and Sex: Cholesterol levels tend to change with age, and men generally have higher total cholesterol and lower HDL than pre-menopausal women.
• Certain medical conditions: Conditions such as an underactive thyroid (hypothyroidism), diabetes, and kidney disease can affect cholesterol levels.

Factors that may lead to a lower ratio (more favourable):

• Genetics: Some individuals may have a genetic predisposition to higher HDL levels.
• Diet: A diet rich in fruits, vegetables, whole grains, and healthy fats (like those found in olive oil, nuts, and oily fish) can help improve cholesterol profiles.
• Regular physical activity: Consistent aerobic exercise is known to increase HDL cholesterol.
• Maintaining a healthy weight: Losing excess weight can positively impact both total cholesterol and HDL levels.
• Not smoking: Quitting smoking can lead to an increase in HDL cholesterol.
• Moderate alcohol consumption: For some individuals, moderate alcohol intake may be associated with higher HDL levels, though this is a complex area and not a recommendation for starting to drink.

Lifestyle factors that may help

Making certain lifestyle adjustments can be beneficial for improving your Total Cholesterol / HDL Cholesterol Ratio. These are areas you might consider discussing with your GP:

• Dietary choices: Focusing on a diet that is lower in saturated and trans fats and higher in unsaturated fats, fibre, fruits, and vegetables is often recommended. This might involve choosing lean meats, fish, and plant-based protein sources, and incorporating plenty of whole grains.
• Regular exercise: Engaging in regular physical activity, particularly aerobic exercises like brisk walking, jogging, swimming, or cycling, can help to raise your HDL cholesterol. Aiming for at least 150 minutes of moderate-intensity activity per week is a common guideline.
• Weight management: If you are carrying excess weight, losing even a small amount can have a positive impact on your cholesterol levels and overall cardiovascular health.
• Smoking cessation: If you smoke, quitting is one of the most significant steps you can take to improve your heart health. It can lead to improvements in your HDL cholesterol levels.
• Limiting alcohol intake: If you drink alcohol, doing so in moderation is generally advised.

Questions to discuss with your GP

When you receive your blood test results, it's always a good idea to discuss them with your GP. Here are some questions you might consider asking:

• What does my specific Total Cholesterol / HDL Cholesterol Ratio mean for my personal risk of heart disease?
• Are there any other factors, such as my blood pressure or family history, that I should consider alongside this ratio?
• What are the recommended lifestyle changes that would be most beneficial for me based on my results?
• Are there any specific dietary patterns or types of exercise that you would suggest I focus on?
• Should I be considering any further tests or investigations?
• How often should I have my cholesterol levels checked in the future?