HAS-BLED estimates the risk of major bleeding for someone taking — or considering — a blood thinner for atrial fibrillation. It is the companion to the CHA₂DS₂-VASc stroke score: one estimates the risk a blood thinner protects against, the other the risk it carries. This page works out the score in plain English.

It is for people weighing anticoagulation with their doctor. Each letter is a factor — uncontrolled high blood pressure, kidney or liver problems, prior stroke, prior bleeding, unstable blood test results, age, and certain medicines or alcohol use — and they add up to a bleeding-risk score.

It runs on your device and saves nothing. Its real value is the fix-list it produces: several of the points are things that can be improved, which turns a high score into a to-do list rather than a dead end.

General information to help you prepare for your GP — not a diagnosis, not personal medical advice.

Dr HB LoIntegrative GP
Bleeding-risk tool

HAS-BLED score

Your bleeding-risk score, sorted into the bits you can actually change

A high HAS-BLED score isn't a reason to stop your blood-thinner. It's a list of things to tighten up so it's safer. Answer a few plain questions and we'll split your score into the fixable rows and the fixed ones — a one-pager to take to your GP.

Answer these to build your score

Every question is optional. "Not sure" is a real answer — we carry it through to your GP list rather than dropping it. Nothing you type leaves your browser.

Bleeding-risk questions
Is your blood pressure usually high (top number often over 160)? This is one of the things you can change. The over-160 cut-off is the HAS-BLED "H" definition (GPnotebook AU).
Do you have kidney disease, dialysis, or a transplant?
Do you have serious liver disease (cirrhosis or abnormal liver tests)?
Have you ever had a stroke?
Have you had a major bleed before, or a condition that makes you bleed easily (e.g. low platelets, anaemia)?
Has anyone taken more of a blood-thinner than prescribed, or a child has got into the tablets? This is a safety check, not part of your score.
If you take warfarin: are your INR blood tests often out of range? This is one of the things you can change. Skip if you're on a newer blood-thinner (a DOAC) or none.
Over 65 adds a point. Leave blank to skip it.
Do you regularly take aspirin or anti-inflammatory painkillers (ibuprofen, Nurofen, Voltaren)? This is one of the things you can change.
Do you usually have 8 or more standard drinks a week? This is one of the things you can change. The 8-drinks/week mark is the HAS-BLED alcohol definition (GPnotebook AU).
Or tap a scenario to fill it in

This helps you prepare for a conversation — it can't tell if a bleed is happening now. If you're worried something's wrong right now, call 000 or your GP.

How to read your result

The score runs from 0 to 9. A score of 3 or more is usually described as high bleeding risk — but, crucially, that is a flag to review and reduce the modifiable risks, not a reason to avoid a blood thinner that is protecting you from stroke.

Look at which points are yours. Uncontrolled blood pressure, heavy alcohol use, certain concurrent medicines, and unstable blood-test control are all potentially modifiable — addressing them can lower the score. Age and past stroke are fixed. The split between the two is the most useful thing to bring to your GP.

HAS-BLED is read together with CHA₂DS₂-VASc, never alone. For most people whose stroke risk is high enough to warrant a blood thinner, a high HAS-BLED score means "manage the bleeding risks carefully and review more often", not "stop the medicine". That balance is a clinical decision, made with you.

Australian guideline context

HAS-BLED is referenced in the NHF / CSANZ Australian atrial fibrillation guidelines as a way to identify and address modifiable bleeding risks before and during anticoagulation — explicitly not as a tool for denying a blood thinner to someone who needs it.

Blood pressure control, medicine review (including over-the-counter anti-inflammatories), and alcohol moderation are the levers the guideline highlights. Your GP can help you work through whichever apply to you.

What to do with the result

Bring your score and your fix-list to your GP: "My HAS-BLED score is X — these are the points I might be able to change; can we work on those?" That makes the appointment about lowering risk rather than abandoning a treatment.

A high bleeding score is a prompt to manage the modifiable factors and review more often — it is never, on its own, a reason to start or stop a blood thinner. That decision rests with your doctor, weighing both scores together.

Common questions

Does a high HAS-BLED score mean I should stop my blood thinner?
No. A high score means your bleeding risks should be reviewed and reduced where possible, and that you may need closer monitoring. For most people with high stroke risk, the blood thinner still does more good than harm — that balance is your doctor's call, not the score's.
Which parts of the score can I actually change?
Often: uncontrolled blood pressure, heavy alcohol use, and certain medicines (such as regular anti-inflammatories). Stable blood-test control can also help. Age and a previous stroke or bleed are fixed. The tool separates the two for you.
Is a high HAS-BLED the same as a high stroke risk?
No — they are opposite sides of the decision. HAS-BLED estimates bleeding risk; CHA₂DS₂-VASc estimates stroke risk. Anticoagulation decisions weigh the two together.

Related on this site

Sources

General information to help you prepare for your GP — not a diagnosis, not personal medical advice. This tool does not start, stop or change any medicine. If something is urgent, call 000.

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