Do I need to fast?
Usually not. Total, HDL and non-HDL cholesterol — the values UK guidance treats as the main targets — are reliable whether or not you have eaten, so most people can give a sample at any time of day.
Fasting helps in one specific situation: if triglycerides are the question, or a previous triglyceride result was raised. We will tell you which applies to you before you go.
My cholesterol is high. Do I need a statin?
The number alone does not answer that. The decision rests on your overall cardiovascular risk — age, blood pressure, smoking, diabetes and family history alongside the cholesterol.
We calculate QRISK3 and show you the figure, with and without treatment, so you decide on real numbers rather than on a result that looked high on a printout.
Which number should I actually look at?
Non-HDL cholesterol, which is total minus HDL and captures everything that matters in one figure.
Total cholesterol on its own is a poor guide — a high figure driven by high HDL is a very different situation from the same figure driven by high LDL.
Can diet fix it?
Diet helps, and lifestyle alone rarely achieves what a statin achieves. Both are true.
Replacing saturated fat with unsaturated fat is the change with the best evidence, alongside soluble fibre and plant stanols. It is worth doing whether or not you take a tablet, because it improves overall risk rather than just the number.
My father had a heart attack at 50 and my cholesterol is very high.
That combination should prompt assessment for familial hypercholesterolaemia — an inherited condition affecting roughly 1 in 250 people and substantially underdiagnosed.
It means treatment from a younger age, and it means testing relatives, which is where much of the benefit lies. NHS referral is free.
What is Lp(a) and should I have it measured?
Lipoprotein(a) is almost entirely genetic and is not on standard panels. A raised level is an independent risk factor that diet does not change.
It only needs measuring once in a lifetime, and it is worth doing where there is a strong family history of early heart disease — because it changes the risk calculation.
Could something else be raising my cholesterol?
Yes, and it is worth excluding before treating. An underactive thyroid raises cholesterol and is entirely reversible — and it is routinely not checked.
Also: poorly controlled diabetes, kidney or liver disease, heavy alcohol use, and certain medicines.
Does it matter when I am tested?
Avoid testing during or shortly after an acute illness, infection or surgery — cholesterol falls temporarily, sometimes for weeks, and the result underestimates your usual level.
Pregnancy raises it substantially, so testing then is not informative.
How often should I recheck it?
Every three months while a dose is being adjusted, then annually once stable. Every few weeks tells you nothing, and anyone selling that frequency is selling tests.
Is high HDL protective?
Associated with lower risk, yes — but raising it with drugs has repeatedly failed to reduce events in trials.
Which is worth knowing before buying anything marketed to raise it. Lowering LDL is what has been shown to work.