What the Test Actually Is

A non-contrast CT scan of the heart. No injection, no dye, and no fasting in most protocols. You lie on the scanner couch, hold your breath for a few seconds, and it is complete.

Plaque Detection

The scanner detects calcified deposits within the walls of your coronary arteries. As atherosclerotic plaque matures, calcium accumulates — making total calcium a reliable proxy for total arterial plaque burden built over years.

Agatston Score Calculation

Specialised software converts calcified area and density into a single number: the Agatston Score. It measures overall plaque burden rather than degree of arterial narrowing.

What It Is NOT

A calcium score is not an angiogram. It does not show whether an artery lumen is narrowed or by what exact percentage. It measures calcified plaque burden, not immediate vessel stenosis.

What Your Agatston Score Means

Here is how clinical guidelines interpret absolute Agatston score bands:

Agatston Score What It Indicates What Typically Follows
0 No detectable calcified plaque Supports deferring statin therapy in borderline risk — read South Asian caveat below.
1 – 99 Mild calcified plaque burden Statin therapy considered; aggressive lifestyle risk-factor control.
100 – 299 Moderate plaque burden Statin therapy generally indicated; risk factor management intensified.
300 – 399 Extensive calcified plaque High risk classification; aggressive preventive management.
400+ Heavy plaque burden High-intensity statins, aspirin consideration, comprehensive cardiology review.

Your Percentile Matters as Much as Your Absolute Score

A score of 80 in a 70-year-old man is unremarkable. The same score of 80 in a 40-year-old man is concerning — placing him above the 90th percentile for his age and sex. Always ask for your age and sex percentile on your report. Guidelines use scores at or above the 75th percentile as a clear statin trigger.

The South Asian Caveat: Why a Zero Score Means Less for Us

This is the most critical medical distinction on this page — and why we treat calcium scoring with careful clinical precision:

Soft Plaque Blind Spot in South Asians

Calcium scoring detects calcified (hard) plaque only. It is completely blind to soft, non-calcified plaque — which is younger, unstable, and often more dangerous.

• In general populations, ~1–2% of symptomatic patients with a zero calcium score have non-calcified plaque.
• In published South Asian cohort studies, 28.8% of symptomatic patients with a zero calcium score had coronary artery disease on further imaging.
• AI-enabled plaque analysis revealed 63% of South Asians showed premature plaque burden with a heavy predominance of soft non-calcified plaque in younger individuals.

Practical takeaway for patients:

• If you are symptom-free and get a calcium score of 0: That is great news! However, it does not mean you can ignore blood pressure, cholesterol, diabetes, or smoking.
• If you have symptoms (chest pain, breathlessness): A calcium score is the WRONG test. A zero score does NOT rule out soft plaque. Symptomatic patients require CT Coronary Angiography or a stress test to view the artery lumen directly.

Who Should Consider a Calcium Score

Discuss a calcium score with your doctor if you are symptom-free and fall into any of these categories:

Intermediate Cardiovascular Risk

Aged 40–70 with borderline risk where statin therapy decision is uncertain.

Family History of Early Heart Disease

Parent or sibling with heart attack before 55 (men) or 65 (women).

Diabetes Mellitus

Long-standing diabetes where cardiac symptoms may be muted or silent.

Undecided Statin Therapy

Converts an estimate argument into concrete visual plaque evidence.

Multiple Risk Factors

Hypertension, current/past smoking history, obesity, or sedentary lifestyle.

Objective Baseline Assessment

Provides a clear numerical baseline prior to starting long-term preventive therapy.

Who Should NOT Get a Calcium Score

Being clear about when NOT to perform a test protects patient safety and avoids misleading reassurance:

Anyone With Current Cardiac Symptoms

Chest pain or breathlessness requires CT Angiography or TMT to assess narrowing directly.

Known Coronary Artery Disease

Prior heart attack, stent, or bypass patients already have confirmed disease; score adds no value.

Already On High-Intensity Statins

If already taking strong statins for clear indications, the score will not change management.

Healthy Young Adults (<30 Years)

Calcium accumulates with age; a zero in a healthy 25-year-old is expected and uninformative.

Calcium Score vs CT Coronary Angiography

Performed on the same scanner but designed for completely different clinical goals:

Feature Coronary Calcium Score CT Coronary Angiography (CTCA)
Contrast Dye? No dye required Yes — IV contrast injected
What it Measures Calcified plaque burden Artery lumen & percentage narrowing
Detects Soft Plaque? ❌ No (Blind to soft plaque) ✓ Yes (Full soft & hard plaque mapping)
Preparation Required Minimal (No fasting usually) Fasting 4h, caffeine stoppage, eGFR report
eGFR Kidney Test Needed? No Yes (Mandatory for contrast clearance)
Radiation Dose Ultra-low Low (384-slice prospective gating)
Duration 5 – 10 minutes 1 – 2 hour total appointment
Primary Indication Risk screening in asymptomatic adults Diagnosis in symptomatic patients

What Happens After Your Score Report

A number on its own changes nothing — the true clinical value lies in taking action based on your band:

Score 0 (Zero)

Reassuring in symptom-free individuals. Maintain risk factor control. Re-evaluation in several years may be considered by your physician.

Score 1 – 99 (Mild)

Early-stage disease detected. Excellent timing for lifestyle modification, diet, blood pressure control, and statin consideration.

Score 100 – 399 (Moderate)

Significant plaque burden. Preventive statin therapy generally indicated; risk factor management becomes high priority.

Score 400+ (Heavy)

Extensive plaque burden. High-intensity statin therapy, aspirin consideration, and comprehensive cardiologist evaluation.

Preparing for a Coronary Calcium Score

Calcium scoring preparation is considerably simpler than a contrast angiography scan:

Simple Prep

Arrival Checklist

  • ✓
    No Contrast Injection: No kidney function (eGFR) blood report is required for calcium scoring alone.
  • ✓
    Dietary Restrictions: No fasting is needed in most protocols — plain water is encouraged.
  • ✓
    Avoid Caffeine: Refrain from tea, coffee, cola, and energy drinks prior to the test to maintain a steady heart rate.
  • ✓
    Clothing: Wear comfortable clothes without metallic zippers or chains.
  • ✓
    Bring Prior Reports: Bring doctor prescription and recent lipid profile for clinical context.

Where to Get Calcium Scoring in Varanasi

Performed on our high-speed 384-slice Siemens CT scanner at Karauli Diagnostics branches:

Bhojubeer Branch

S.2/326 E-3A, Plot No. 18/1, Gilat Bazar, Bhojubeer, Varanasi, Uttar Pradesh – 221002

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Sankat Mochan Branch

B. 36/4-27, Ramapuri Colony, Near Sankat Mochan Temple, Saket Nagar Colony, Varanasi, Uttar Pradesh – 221005

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Manduadih Branch

Shop No. 1, MS Commercial Complex, Manduadih Varanasi, Uttar Pradesh – 221005

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Maldahiya Branch

C21/30, A1-A2 Pishachmochan Road Near Ganga Palace Maldhaiya, Varanasi, Uttar Pradesh – 221002

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Awaleshpur Branch

Amra Chauraha, Above Grihasthi Supermarket, Varanasi – 221106

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Frequently Asked Questions

Everything you need to know about coronary calcium scoring:

Zero means no detectable calcified plaque. Scores of 1–99 indicate mild plaque, 100–299 moderate, 300–399 extensive and 400 or above a heavy burden. However, “normal” depends on your age and sex — a score of 80 is unremarkable at 70 and concerning at 40. Ask for your percentile alongside the absolute number.
Not entirely, and this matters particularly for South Asian patients. Calcium scoring detects only calcified plaque and is blind to soft, non-calcified plaque. In one South Asian cohort, 28.8% of symptomatic patients with a zero score had coronary disease of some degree. If you have symptoms, a zero calcium score is not sufficient reassurance.
A calcium score is a quick non-contrast scan measuring calcified plaque burden — a risk-assessment tool for people without symptoms. CT coronary angiography uses contrast dye to show the artery lumen and degree of narrowing — a diagnostic test for people with symptoms or abnormal prior tests.
No — you need a different test. A calcium score does not assess narrowing and cannot see soft plaque. Symptomatic patients generally require a stress test or CT coronary angiography. Discuss with your doctor.
No contrast injection is required and most protocols do not require fasting. You may be asked to avoid caffeine, since a steady heart rate improves image quality. Confirm specific requirements when booking.
Guidelines identify roughly ages 40–70 at intermediate cardiovascular risk as the group where the score is most useful. Calcium accumulates with age, so a zero in a healthy person in their twenties is expected and adds little. People with strong family history or diabetes may be advised differently — discuss with your physician.
Generally no. Calcium scores tend to rise over time. The purpose of treatment is not to reduce the number but to slow progression and stabilise plaque. A rising score under treatment does not necessarily mean treatment is failing — interpret it with your cardiologist.
Screening tests performed without symptoms are commonly excluded from Indian health insurance policies, which are typically built around hospitalisation and medically indicated investigation. Check your specific policy’s OPD or preventive-health clause before assuming coverage.
AS

Medically Reviewed by Dr. Ankita Ujjwal Shah (MD, DNB)

Consultant Radiologist, Karauli Diagnostics · Published: 1 August 2026

This article is for general informational purposes and does not replace consultation with a qualified doctor.

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