A borderline or intermediate result means your estimated 10-year risk falls in the range where the next step is not automatic. You are not low enough to set the question aside, and not high enough for the answer to be obvious.
That is the range where extra information is meant to help. The usual sequence is to check for risk enhancers, consider a coronary calcium score if the picture is still unclear, and then decide together with your clinician.
Key takeaways
- Borderline means a 10-year risk of 3% to under 5%, and intermediate means 5% to under 10%.
- Risk enhancers such as early family history, high Lp(a) or high ApoB push real risk above the calculated figure.
- A calcium score is the best-studied tiebreaker when the decision is still uncertain.
- A score of zero usually supports waiting, with exceptions for diabetes, smoking and strong family history.
- The final choice is a shared one, and "lifestyle first, then recheck" is a legitimate option.
What the two bands mean
The 2026 ACC/AHA guideline sorts 10-year risk from the PREVENT calculator into four bands: low under 3%, borderline 3% to under 5%, intermediate 5% to under 10%, and high at 10% or more.1
These numbers look small because PREVENT gives lower estimates than the calculator it replaced. Our guide to the PREVENT risk calculator explains the percentages. This article is about what to do once you have one.
Step 1: Check the inputs and look at the long view
Before acting on a middle-band result, confirm that the blood pressure used was a typical reading for you, that the cholesterol values were recent, and that smoking, diabetes and medications were entered correctly.
Then look at your 30-year estimate if you were given one. A younger adult with a borderline 10-year number can have a much higher long-term risk.
Step 2: Go through the risk enhancers
Risk enhancers are findings the calculator does not take in, and that make your true risk higher than your percentage. The best-known list comes from the 2018 US cholesterol guideline. Some you can answer from memory. Others need a blood test.
| Risk enhancer | How you find out |
|---|---|
| Heart disease in a father or brother before 55, or a mother or sister before 65 | Family history |
| Chronic kidney disease, metabolic syndrome, or an inflammatory condition such as rheumatoid arthritis or psoriasis | Medical history |
| Preeclampsia, or menopause before age 40 | Medical history |
| South Asian ancestry | Family background |
| LDL cholesterol persistently 160 mg/dL or higher, or triglycerides persistently 175 mg/dL or higher | Standard lipid panel |
| ApoB 130 mg/dL or higher, Lp(a) 50 mg/dL (125 nmol/L) or higher, or hs-CRP 2.0 mg/L or higher | Additional blood tests |
In that guideline, the presence of risk enhancers in a person at intermediate risk favors starting statin therapy.2
Note the last row. Three of the enhancers cannot be known unless someone orders the test. Lp(a) is the one most often missed.
One caution: this list was written for the older risk calculator and its higher bands. The idea carries over, but your clinician will apply it with the current guideline in mind.
Step 3: Consider a calcium score as the tiebreaker
If the enhancers do not settle it, a coronary artery calcium (CAC) scan can. It shows whether calcified plaque is already present in the heart arteries.
The evidence for using it this way is reasonably strong. In a US study of 1,330 adults classed as intermediate risk by an older score, researchers compared six extra markers, and coronary calcium improved risk prediction more than any of the others.3
The same study found that family history and hs-CRP also predicted events independently, while carotid wall thickness did not.
How the result is used:
- Zero. Under the 2026 guideline, a score of zero supports deferring medication and rescanning in three to seven years, unless you have diabetes, smoke, have familial hypercholesterolemia or have a strong family history.1
- 1 to 99. In the 2018 guideline this favored statin therapy, especially from age 55.
- 100 or more, or at or above the 75th percentile for your age and sex. This favored statin therapy more firmly.
A zero is common in this group. In a large US cohort, 44% of the adults who qualified for a statin under the guideline of the time had a calcium score of zero, and their rate of cardiovascular events was about 4 per 1,000 people per year.4
For what each score range means, see our guide to the coronary calcium score.
An honest caveat
Extra testing refines an estimate. It has not been proven to save lives. The US Preventive Services Task Force concluded in 2018 that the evidence was insufficient to assess the balance of benefits and harms of adding a calcium score or hs-CRP to traditional risk assessment in adults without symptoms.5
A CAC scan also involves a small dose of radiation, and it cannot see plaque that has not calcified. It is a tool for a decision that is truly uncertain.
Step 4: Decide together
The 2018 guideline describes a clinician-patient risk discussion that covers your major risk factors, any risk enhancers, the potential benefits of lifestyle changes and of statin therapy, the potential for side effects, cost, and your own preferences.2
In practice there are three reasonable outcomes:
- Work on lifestyle and recheck your numbers at an agreed time.
- Gather more information first, such as the blood tests above or a calcium score.
- Start a medication, usually a statin, alongside lifestyle changes.
Do not start, stop or change a medication without your prescriber.
How a Cardio Res-Q assessment maps onto these steps
The Comprehensive Assessment ($775) covers the blood-test enhancers: ApoB, Lp(a) and hs-CRP, along with homocysteine, insulin, glucose and A1c, the Cleveland Heart cardiac panel and Dr. Varano's clinical evaluation. The Enhanced Assessment ($999) adds a coronary calcium score and a CIMT ultrasound.
Two things to know. The calcium scan is done at an outside imaging facility on your provider's order, as a separate self-pay study that typically costs $100 to $200. And CIMT has a weaker evidence base than calcium scoring: US guidance does not recommend it as a routine test for predicting a first event.6
We are glad to share results with your own doctor. To choose between the two options, read Comprehensive vs. Enhanced, or book from the Cardio Res-Q program page.
Are You a Candidate for Cardio Res-Q?
Three quick questions about the risk factors we screen for. Your answers stay between you and the clinic.
Frequently asked questions
Is a 6% 10-year risk high?
It is intermediate on the current scale. It means that out of 100 people with numbers like yours, about 6 would be expected to have a cardiovascular event over ten years.
Do I need a statin if my risk is intermediate?
Not automatically. It depends on your risk enhancers, any calcium score, your LDL cholesterol and your preferences. Decide with your clinician.
If my calcium score is zero, can I skip medication?
Often a zero supports waiting and rescanning in a few years. The main exceptions are diabetes, smoking, familial hypercholesterolemia and a strong family history, where a zero is less reassuring.
Should everyone with borderline risk get a calcium scan?
No. If you have no risk enhancers and would not want medication either way, a scan is unlikely to change anything. It is most useful when you and your clinician are undecided and the result would tip the decision.
Related reading
This article is for general education and is not medical advice. Decisions about testing and medication should be made with your clinician. If you have chest pain or other symptoms of a heart attack, call 911.
