HAS-BLED Score Calculator

HAS-BLED Score Calculator for Cardiology. A higher total prompts review of factors such as blood pressure, interacting medicines and anticoagulation control. Cohort-derived annual bleeding percentages are not personal predictions.

For shared guidance on choosing a tool and documenting results, read the clinical calculator workflow.

How this calculator works

HAS-BLED summarizes specified bleeding-risk factors in AF. Renal impairment for this score is not any reduced eGFR: the historical criterion involves dialysis, transplantation or sufficiently elevated serum creatinine.

When to use this calculator

Use to identify modifiable risks and the need for closer follow-up, alongside stroke-risk assessment. It is not an independent decision to withhold anticoagulation.

Inputs used

  • Blood pressure
  • Renal/liver disease
  • Stroke history
  • Bleeding history
  • INR control
  • Age
  • Drugs/alcohol

Clinical interpretation

A higher total prompts review of factors such as blood pressure, interacting medicines and anticoagulation control. Cohort-derived annual bleeding percentages are not personal predictions.

Worked example

A 76-year-old with labile warfarin INR and aspirin use, systolic BP 150, creatinine 1.5 mg/dL, no dialysis/transplant and no other criteria scores 3. An eGFR of 40 alone adds no renal point.

Limitations and safety notes

Use the precise definitions in the chosen source. The live liver and alcohol labels are abbreviated. Labile INR is a warfarin-control concept, not a routine DOAC laboratory target.

Frequently asked questions

Does a score of 3 prohibit anticoagulation?

No. Review modifiable bleeding risks and net clinical benefit rather than treating a threshold as a contraindication.

Does every stage of CKD add a point?

No. Apply the score's renal definition, not a generic CKD label.

References

  • Pisters R et al. A novel user-friendly score (HAS-BLED) to assess 1-year risk of major bleeding in patients with atrial fibrillation. 2010. PMID: 20299623. https://pubmed.ncbi.nlm.nih.gov/20299623/
  • ACC/AHA/ACCP/HRS. 2023 Guideline for the Diagnosis and Management of Atrial Fibrillation. https://pmc.ncbi.nlm.nih.gov/articles/PMC11104284/

Editorial review and citation methodology

Maintained by the Quick Medical Calculator Editorial Team. Content record date: September 7, 2026. A content date is not evidence of independent clinical review. Individual clinical sign-off is not recorded on this page.

  • Prefer original validation studies for scoring systems and prediction tools.
  • Use current specialty society guidance, transplant allocation policy, public health guidance, or regulator resources when they govern clinical use.
  • Include limitations and safety notes when a calculator is population-specific, context-dependent, or unsuitable as a standalone decision tool.

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