Do You Need a Cholesterol Test?

Cholesterol is a fatty substance your body needs to build cells and make hormones. Your liver produces most of it, and it travels around your bloodstream in packages called lipoproteins. The problem isn't cholesterol itself — it's having the wrong balance of it, which can quietly raise your risk of heart disease and stroke over many years. A cholesterol test is a simple way to see where you stand.

What the test measures

A cholesterol (lipid) profile breaks your result into several parts rather than a single number:

• LDL cholesterol — often called "bad" cholesterol, because higher levels can build up in artery walls.
• HDL cholesterol — the "good" cholesterol, which helps carry cholesterol away from the arteries; higher is generally better.
• Triglycerides — another blood fat, linked to diet, alcohol and weight.
• Total cholesterol to HDL ratio — compares your total against your protective HDL for a clearer risk picture.
• Non-HDL cholesterol — total cholesterol minus HDL, increasingly used as a single, useful risk marker.

Why it usually has no symptoms

High cholesterol very rarely causes any symptoms you'd notice. It doesn't make you feel unwell day to day — the first sign can unfortunately be a heart attack or stroke. That's exactly why testing matters: it's one of the few ways to catch a hidden risk factor early, while there's plenty you can do about it.

Who should get tested, and how often

It's worth checking your cholesterol if you:

• Are over 40, or younger with a family history of early heart disease or high cholesterol
• Are overweight, smoke, or have high blood pressure or diabetes
• Have a close relative who had a heart attack or stroke at a young age
• Simply want a baseline as part of a general health check

If your levels are healthy, a repeat every few years is usually enough. If they're raised or you're managing your risk, your doctor may suggest checking more often.

Do I need to fast?

For a full lipid profile — particularly to measure triglycerides accurately — you may be asked to fast for around 10–12 hours beforehand, drinking only water. We'll let you know when you book whether fasting is needed, so you can plan an early-morning appointment.

What happens if it's high

A raised result doesn't automatically mean medication. The first-line steps are usually lifestyle: a diet lower in saturated fat, more fibre, regular exercise, cutting back on alcohol, stopping smoking and reaching a healthy weight can all improve your numbers. Where risk is higher, a doctor may discuss medication such as statins — but that's a decision made with your full risk picture, not on cholesterol alone.

When to get checked

If you've never had your cholesterol measured, or it's been several years, a test is a sensible move — especially with any of the risk factors above. Knowing your numbers puts you in control and gives your doctor a clear starting point.

Written by Dr Ibrar Ahmed — MBChB MRCP MRCGP PhD PG Dip (Cardiology)
Specialist interest: Cardiovascular Medicine · OneMedicine, CQC-registered clinic