A lipid panel usually arrives as four numbers and a column of arrows. The arrows are less useful than they look: the four values interact, the ranges differ by individual risk, and the two figures that modern guidance leans on most are often not printed at all — non-HDL cholesterol and the total/HDL ratio. The tool below works them out and reads the panel as a whole.
In short: LDL is the main treatment target, HDL is the one where higher is better, triglycerides respond most to diet and alcohol, and non-HDL cholesterol — total minus HDL — captures every harmful particle in one number. Enter values in mmol/L or mg/dL. No single value is a diagnosis: targets depend on your overall risk.
Cholesterol interpreter
Enter the four values from your report. The calculation runs in your browser and nothing is stored or sent anywhere.
What each value actually is
LDL — the one treatment aims at
LDL carries cholesterol from the liver out to the tissues. When there is more of it than the body needs, it accumulates in artery walls, and that accumulation is the beginning of atherosclerosis — the same process behind heart attack, stroke and narrowed leg arteries. It is the main target because lowering it demonstrably lowers events.
HDL — higher is better, but not infinitely
HDL carries cholesterol back towards the liver, and a low level is associated with higher risk. One nuance is worth knowing: trials of drugs that raise HDL have not produced the benefit the association predicted, so HDL is read as a marker of risk rather than a lever to pull. The things that raise it — physical activity, stopping smoking, weight loss — are worth doing for other reasons anyway.
Triglycerides — the most changeable number
Triglycerides are the body's circulating fat store and respond faster than any other value on the panel to alcohol, refined carbohydrate, weight and uncontrolled diabetes. A single high reading after an unusual week is not the same as a persistently high one. Above a certain level they also carry a risk that has nothing to do with arteries: inflammation of the pancreas.
| Value | Usual range | Borderline | High |
|---|---|---|---|
| Total cholesterol | under 5.2 mmol/L (200 mg/dL) | 5.2-6.2 (200-239) | 6.2 and over (240+) |
| LDL | under 2.6 mmol/L (100 mg/dL) optimal | 3.4-4.1 (130-159) | 4.1 and over (160+) |
| HDL | 1.0+ men, 1.3+ women (40 / 50 mg/dL) | — | 1.55+ (60+) is protective |
| Triglycerides | under 1.7 mmol/L (150 mg/dL) | 1.7-2.2 (150-199) | 2.3 and over (200+) |
| Non-HDL | under 4.1 mmol/L (160 mg/dL) | 4.1-4.9 (160-189) | 4.9 and over (190+) |
| Total / HDL ratio | under 4 | 4-5 | over 5 |
The two numbers your report probably left out
Non-HDL cholesterol
Subtract HDL from total cholesterol and you have non-HDL: every cholesterol-carrying particle that can lodge in an artery wall, added together rather than counted one by one. It has two practical advantages over LDL. It needs no fasting sample, and it stays reliable when triglycerides are high — precisely the situation in which the usual calculated LDL becomes unreliable and can read misleadingly low. UK and European guidance increasingly treat it as the working target, yet most laboratory reports still do not print it.
Total / HDL ratio
Dividing total cholesterol by HDL produces a single figure that captures the balance between the two, and it is one of the inputs used by cardiovascular risk calculators. A ratio under 4 is generally the aim. It is a summary rather than a target in itself — nobody is treated to a ratio — but it explains why two people with the same total cholesterol can carry quite different risk.
Why a number alone rarely decides treatment
The ranges above describe a general population. What a given LDL means for you depends on everything else: age, blood pressure, smoking, diabetes, family history of early heart disease, kidney function. Someone with an LDL of 3.5 mmol/L and no other risk factor is in a different position from someone with the same value who smokes and has diabetes — and someone who has already had a heart attack is in a third position again, with targets far stricter than any row in that table.
This is why a lipid panel is read alongside a risk estimate rather than on its own. The 10-year cardiovascular risk calculator uses your cholesterol figures together with the other factors, and is honest about what it cannot see.
Two findings deserve attention beyond a routine recheck. An LDL of 4.9 mmol/L (190 mg/dL) or above, especially with a family history of heart attack or stroke before 55 in men or 65 in women, raises the question of familial hypercholesterolaemia — an inherited, common and treatable condition that is widely under-diagnosed and assessed differently from ordinary raised cholesterol. And triglycerides of 5.6 mmol/L (500 mg/dL) or above carry a risk of pancreatitis, which is a separate and more immediate concern than cardiovascular risk. Neither is a reason to panic; both are reasons to be seen rather than to repeat the test in six months.
Getting a test that means something
- Fasting is usually unnecessary. Non-fasting samples are acceptable for most purposes under current guidance; fasting is requested mainly when triglycerides are high or being tracked.
- Avoid testing during acute illness or in the weeks after a heart attack, surgery or infection — the values are temporarily unrepresentative.
- Alcohol in the preceding days raises triglycerides noticeably; a single heavy evening can distort the result.
- Repeat before acting on a surprising result. Day-to-day biological variation is real, and decisions are rarely made on one panel.
- Ask for non-HDL if it is not printed. No extra test is needed — it is arithmetic on figures you already have.
Frequently Asked Questions
Can I enter my results in mmol/L?
Yes. Choose the unit above the fields — mmol/L is standard in the UK, Europe and most of the world, mg/dL in the US and Türkiye. The tool converts internally and warns you if a value looks as though it was entered in the other unit. Note that cholesterol and triglycerides use different conversion factors, which is a common source of error in manual conversions.
What is non-HDL cholesterol and why does it matter?
It is total cholesterol minus HDL: every cholesterol particle capable of depositing in an artery wall, in one figure. It needs no fasting sample and remains reliable when triglycerides are high, which is exactly when a calculated LDL becomes unreliable. It is increasingly used as the working target, and it is simple arithmetic on numbers already in your report.
My LDL is fine but my triglycerides are high — does that matter?
Yes, in two separate ways. Raised triglycerides usually travel with other features of metabolic risk, and when they are high the calculated LDL understates the problem — which is where non-HDL gives a truer picture. Separately, very high triglycerides carry a risk of pancreatitis that is unrelated to the arteries.
Is high HDL always good?
Higher HDL is associated with lower risk, but it is read as a marker rather than a lever: raising it with drugs has not delivered the benefit the association predicted, and very high levels do not confer extra protection. Treat it as useful information about overall metabolic health rather than a target to chase.
Do I need to fast before a cholesterol test?
Usually not. Current guidance accepts non-fasting samples for most purposes. Fasting is generally requested when triglycerides are high or being monitored, or when your doctor wants a directly comparable value.
What LDL should I be aiming for?
That depends entirely on your overall risk, which is why no single figure applies to everyone. The general ranges here suit people without established cardiovascular disease; anyone who has had a heart attack, stroke or vascular procedure, or who has diabetes, is given substantially lower targets set individually.
Can diet and exercise alone bring cholesterol down?
They can move it, and they improve risk through routes that have nothing to do with the number — blood pressure, weight, glucose and fitness. How far they move LDL varies widely between individuals, and in familial hypercholesterolaemia lifestyle alone is not sufficient, which is one reason that diagnosis matters.
Do you see international patients?
Yes. International and Gulf patients are seen in Istanbul with English- and Arabic-speaking support, and an initial remote assessment can be made from your existing reports and test results before you travel.
References
- NHS — High cholesterol
- MedlinePlus (NIH) — Cholesterol levels: what you need to know
- National Heart, Lung, and Blood Institute — Blood cholesterol
- NHS — Cholesterol levels and what they mean
- British Heart Foundation — High cholesterol
Related Pages
- 10-year cardiovascular risk calculator
- Vascular check-up
- Peripheral artery disease (leg)
- Carotid artery disease
- Stroke: causes and prevention
- Aortic aneurysm
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This content is for information only and does not replace diagnosis or treatment. Assessment is made by a medical examination.
