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Intel Lab Diagnostics Dubai
Single Biomarker

Apolipoprotein B (Apo B)

LDL Structural Protein

Apo B is the main protein in LDL ('bad') cholesterol and other atherogenic particles. Elevated levels indicate a higher number of dangerous cholesterol particles and increased heart disease risk.

BLOOD24 HOURSNO FASTING
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  • Free home collection
  • Physician-reviewed report

24 Hours

Turnaround

Blood

Sample

About This Test

What the Apolipoprotein B (Apo B) test tells you

Apolipoprotein B is the structural protein of every lipoprotein particle capable of depositing cholesterol in an artery wall: LDL, VLDL, IDL and Lp(a). Each of those particles carries a single Apo B molecule, and that fact is what makes the test useful: measuring Apo B counts the particles themselves rather than weighing the cargo inside them. LDL cholesterol, by contrast, measures how much cholesterol those particles happen to be carrying. Two people can have the same LDL cholesterol while one carries it in a few large, cholesterol-rich particles and the other in many small, cholesterol-poor ones, and it is the number of particles that determines how many can enter the artery wall.

This distinction matters most in exactly the people who are hardest to assess. In insulin resistance, type 2 diabetes and raised triglycerides, LDL particles tend to be small and cholesterol-depleted, so LDL cholesterol can look entirely acceptable while the particle count is high. Where the two measurements disagree, Apo B is increasingly regarded as the better guide to risk, and it also captures the contribution of triglyceride-rich remnant particles that an LDL cholesterol measurement largely misses.

For this reason Apo B is increasingly used to judge whether cholesterol treatment has done enough, particularly when LDL cholesterol has reached its intended level but concern about risk remains. It is not a substitute for the wider clinical assessment your doctor makes from blood pressure, glucose, smoking status, family history and, where appropriate, imaging. A raised result is a signal to look more carefully at overall risk rather than a statement that arterial disease is present.

Sample type
Blood
Measured in
mg/dL
Turnaround
24 Hours
Fasting
Not required
Best for
Adults 40+
Why Get Tested?

Recommended for advanced cardiovascular risk stratification, particularly when triglycerides are elevated or there is discordance between LDL-C and clinical risk.

  • Counting atherogenic particles

    Each particle capable of depositing cholesterol in an artery carries one Apo B molecule, so the test counts particles instead of measuring the cholesterol inside them.

  • Resolving discordant lipid results

    When LDL cholesterol and clinical risk disagree, particularly with raised triglycerides, Apo B usually explains why.

  • Assessing residual risk on treatment

    It can show that risk persists after LDL cholesterol has reached the level treatment was aiming for.

  • Guiding risk in metabolic disease

    In diabetes and metabolic syndrome, small cholesterol-poor particles make Apo B the more faithful measure of particle burden.

When This Test Is Ordered

Reasons your doctor may request the Apolipoprotein B (Apo B) test

Your doctor may order this test for any of the reasons below. Some are routine checks, others follow specific symptoms or an earlier result.

  • Refining cardiovascular risk

    • Cardiovascular risk assessment where the standard lipid profile is difficult to interpret.
    • Family history of premature coronary disease, or suspected familial hypercholesterolaemia.

  • Metabolic risk factors

    • Raised triglycerides, diabetes, metabolic syndrome or central weight gain.

  • Reviewing treatment

    • Continuing concern about risk despite an acceptable LDL cholesterol on treatment.
    • Reviewing whether lipid-lowering treatment needs to be intensified.
Preparation
The short version
No prep needed.
  • Blood
  • Free home collection
  • No fasting
  • Results in 24 Hours
  1. 1
    Book any time

    No fasting window: pick any slot that suits you, online or on WhatsApp.

  2. 2
    We come to you

    A DHA-licensed nurse collects your sample at home or in the office: free home collection.

  3. 3
    Results in 24 Hours

    A physician-reviewed, easy-to-read report lands securely by WhatsApp and email.

Prep note
Physician reviewed

Fasting is not required, since apolipoprotein measurements are relatively stable after meals.

If the sample is being taken with a full lipid profile that includes triglycerides, follow the fasting instruction for that panel instead. Sit quietly for a few minutes before the draw, and use similar timing and posture whenever the test is repeated, as this keeps successive results comparable.

Take lipid-lowering medication as prescribed (the purpose of monitoring is to see the treated level) and tell your doctor if the dose has changed recently. Postpone testing for several weeks after a heart attack, major surgery or significant infection.

Understanding Your Results

Apo B counts the particles able to deposit cholesterol in an artery wall, so a lower figure is the favourable direction. A result in the Optimal band, reported in mg/dL, carries the lowest cardiovascular risk. The Borderline band is where lifestyle change is usually advised. A result in the High band is a signal to look carefully at your overall risk, and points towards a diet high in saturated fat, excess weight around the abdomen, insulin resistance or diabetes, an inherited lipid disorder, an underactive thyroid, or kidney or cholestatic liver disease. Apo B is especially useful when triglycerides are raised, because LDL cholesterol can look acceptable while the particle count is high. Pregnancy, acute illness and recent surgery shift it temporarily, and effective lipid-lowering treatment brings it down. Your doctor reads it with the rest of your risk profile rather than alone.

SmartReport
100120
Healthy zone70mg/dLOptimal
Reference ranges · mg/dL
Optimal
Optimal: lowest cardiovascular risk.
40–99
Borderline
Borderline: lifestyle changes often advised.
100–119
High
High: discuss management with your physician.
120–200

Ranges are a guide: your physician interprets your result alongside your symptoms and history.

Reading a High or Low Result

  • What a higher result can point to

    • A diet high in saturated fat, and excess weight carried around the abdomen.
    • Insulin resistance, type 2 diabetes and metabolic syndrome.
    • Familial hypercholesterolaemia and other inherited lipid disorders.
    • An underactive thyroid, nephrotic syndrome or chronic kidney disease.
    • Pregnancy, and medications such as corticosteroids and some antiretrovirals.
    • Cholestatic liver disease, in which lipoproteins accumulate.

  • What a lower result can point to

    • Effective treatment with statins, ezetimibe or PCSK9-directed therapy.
    • An overactive thyroid, which accelerates lipoprotein clearance.
    • Malnutrition, malabsorption or severe chronic illness.
    • Advanced liver disease, reducing lipoprotein production.
    • Rare inherited conditions in which very little Apo B is produced.

These are possibilities, not diagnoses. A single value outside the reference range is interpreted alongside your symptoms, history and other tests: your doctor decides what it means for you.

Limitations & Safety

What this test cannot tell you

  • Apo B counts particles but cannot show whether plaque has formed; imaging and clinical risk factors do that.
  • In people without metabolic disease it overlaps closely with LDL cholesterol and may add little.
  • Acute illness, recent heart attack, surgery and pregnancy shift the result temporarily.
  • It does not separate out Lp(a), which is measured on its own when that is the question.

Risks of the blood draw

  • Mild bruising or brief soreness where the needle went in.
  • Occasional lightheadedness, which settles after a few minutes of rest.
  • Bleeding or infection at the site, which is rare with sterile single-use equipment.
Key Points
  • 1Every particle able to deposit cholesterol in an artery carries a single Apo B molecule.
  • 2The test therefore counts harmful particles rather than measuring the cholesterol they contain.
  • 3Apo B and LDL cholesterol can disagree, and Apo B is regarded as the better guide when they do.
  • 4It is most useful when triglycerides are raised or metabolic disease is present.
  • 5It supports risk assessment and does not diagnose arterial disease.
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Frequently Asked Questions

Everything you need to know about the Apolipoprotein B (Apo B) test. Can't find what you're looking for?

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LDL cholesterol tells you how much cholesterol is being carried; Apo B tells you how many particles are carrying it. When triglycerides are raised the two can diverge, and the particle count tracks risk more closely.