What are the limitations of the who bleeding scale?

While the who bleeding scale is highly validated, it should not replace clinical judgment. OpiCalc provides the latest evidence-based limitations for the who bleeding scale to ensure safe bedside use and optimal diagnostic accuracy.

How does the who bleeding scale compare to other Hematology scores?

The who bleeding scale is a gold-standard diagnostic tool. OpiCalc provides side-by-side clinical guidance to help clinicians choose the most specific evidence-based tool for their patient's presentation.

Is the who bleeding scale free to use?

Yes. OpiCalc provides the who bleeding scale completely ad-free and optimized for mobile bedside use, ensuring you can calculate medical risk swiftly and without distraction.

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WHO Bleeding Scale

WHO Bleeding Grade: Standardized oncology toxicity scale. Grade 3 is objectively defined by the requirement for transfusion.

Guidelines & Evidence

Clinical Details

Section 1

When to Use

Grading the clinical severity of bleeding in patients with thrombocytopenia or coagulation defects.

Standardizing adverse event (AE) reporting in clinical trials.

Monitoring patients receiving high-dose chemotherapy or BMT.

Patient Population

Adult and pediatric patients at risk for hemorrhage.

Section 2

Formula & Logic

Clinical Thresholds

Grade	Severity	Clinical Features
0	None	Absence of bleeding.
1	Mild	Petechiae, ecchymoses, or mild blood loss (e.g., occasional epistaxis).
2	Moderate	Gross bleeding (clinically significant epistaxis, hematemesis, or melena) but hemodynamically stable.
3	Severe	Bleeding requiring red cell transfusion.
4	Life-threatening	Cerebral, pulmonary, or other massive bleeding leading to hemodynamic instability or death.

Section 3

Pearls/Pitfalls

The Transfusion Pivot

Grade 3 is defined objectively by the need for Red Blood Cell (RBC) transfusion. This differs from other scales that might focus on anatomical location alone; here, the "physiologic cost" of the bleeding dictates the grade.

Grade 2 vs 3

A massive epistaxis that is stopped with packing but does not cause an Hb drop requiring transfusion is Grade 2. If the same epistaxis necessitates a unit of RBCs, it is upstaged to Grade 3.

Section 4

Evidence Appraisal

Primary Consensus

Reporting results of cancer treatment.

Miller AB et al. • Cancer. 1981;47(1):207-14.

View Source

Section 5

Literature

Legacy

One of the oldest and most enduring scales in oncology, it provides a universal language for clinicians across different specialties to communicate hemorrhagic risk.

Last Comprehensive Review: 2026

Guidelines & Evidence

Clinical Details

Section 1

When to Use

Grading the clinical severity of bleeding in patients with thrombocytopenia or coagulation defects.

Standardizing adverse event (AE) reporting in clinical trials.

Monitoring patients receiving high-dose chemotherapy or BMT.

Patient Population

Adult and pediatric patients at risk for hemorrhage.

Section 2

Formula & Logic

Clinical Thresholds

Grade	Severity	Clinical Features
0	None	Absence of bleeding.
1	Mild	Petechiae, ecchymoses, or mild blood loss (e.g., occasional epistaxis).
2	Moderate	Gross bleeding (clinically significant epistaxis, hematemesis, or melena) but hemodynamically stable.
3	Severe	Bleeding requiring red cell transfusion.
4	Life-threatening	Cerebral, pulmonary, or other massive bleeding leading to hemodynamic instability or death.

Section 3

Pearls/Pitfalls

The Transfusion Pivot

Grade 2 vs 3

A massive epistaxis that is stopped with packing but does not cause an Hb drop requiring transfusion is Grade 2. If the same epistaxis necessitates a unit of RBCs, it is upstaged to Grade 3.

Section 4

Evidence Appraisal

Primary Consensus

Reporting results of cancer treatment.

Miller AB et al. • Cancer. 1981;47(1):207-14.

View Source

Section 5

Literature

Legacy

One of the oldest and most enduring scales in oncology, it provides a universal language for clinicians across different specialties to communicate hemorrhagic risk.

Last Comprehensive Review: 2026

Related Hematology Tools

CRS Grading

ICANS Grading

aGvHD Grading

NIH Chronic GvHD Scoring

Sickle Cell Disease Risk

Thalassaemia Transfusion Threshold

NTDT Iron Burden Estimator

HbS Percentage Target Calculator

ITP Bleeding Score

IWG ITP Response Criteria

Have feedback about this calculator?Let us know.

WHO Bleeding Scale

WHO Bleeding Grade: Standardized oncology toxicity scale. Grade 3 is objectively defined by the requirement for transfusion.

Guidelines & Evidence

Clinical Details

Section 1

When to Use

Grading the clinical severity of bleeding in patients with thrombocytopenia or coagulation defects.

Standardizing adverse event (AE) reporting in clinical trials.

Monitoring patients receiving high-dose chemotherapy or BMT.

Patient Population

Adult and pediatric patients at risk for hemorrhage.

Section 2

Formula & Logic

Clinical Thresholds

Grade	Severity	Clinical Features
0	None	Absence of bleeding.
1	Mild	Petechiae, ecchymoses, or mild blood loss (e.g., occasional epistaxis).
2	Moderate	Gross bleeding (clinically significant epistaxis, hematemesis, or melena) but hemodynamically stable.
3	Severe	Bleeding requiring red cell transfusion.
4	Life-threatening	Cerebral, pulmonary, or other massive bleeding leading to hemodynamic instability or death.

Section 3

Pearls/Pitfalls

The Transfusion Pivot

Grade 2 vs 3

A massive epistaxis that is stopped with packing but does not cause an Hb drop requiring transfusion is Grade 2. If the same epistaxis necessitates a unit of RBCs, it is upstaged to Grade 3.

Section 4

Evidence Appraisal

Primary Consensus

Reporting results of cancer treatment.

Miller AB et al. • Cancer. 1981;47(1):207-14.

View Source

Section 5

Literature

Legacy

One of the oldest and most enduring scales in oncology, it provides a universal language for clinicians across different specialties to communicate hemorrhagic risk.

Last Comprehensive Review: 2026

Guidelines & Evidence

Clinical Details

Section 1

When to Use

Grading the clinical severity of bleeding in patients with thrombocytopenia or coagulation defects.

Standardizing adverse event (AE) reporting in clinical trials.

Monitoring patients receiving high-dose chemotherapy or BMT.

Patient Population

Adult and pediatric patients at risk for hemorrhage.

Section 2

Formula & Logic

Clinical Thresholds

Grade	Severity	Clinical Features
0	None	Absence of bleeding.
1	Mild	Petechiae, ecchymoses, or mild blood loss (e.g., occasional epistaxis).
2	Moderate	Gross bleeding (clinically significant epistaxis, hematemesis, or melena) but hemodynamically stable.
3	Severe	Bleeding requiring red cell transfusion.
4	Life-threatening	Cerebral, pulmonary, or other massive bleeding leading to hemodynamic instability or death.

Section 3

Pearls/Pitfalls

The Transfusion Pivot

Grade 2 vs 3

A massive epistaxis that is stopped with packing but does not cause an Hb drop requiring transfusion is Grade 2. If the same epistaxis necessitates a unit of RBCs, it is upstaged to Grade 3.

Section 4

Evidence Appraisal

Primary Consensus

Reporting results of cancer treatment.

Miller AB et al. • Cancer. 1981;47(1):207-14.

View Source

Section 5

Literature

Legacy

One of the oldest and most enduring scales in oncology, it provides a universal language for clinicians across different specialties to communicate hemorrhagic risk.

Last Comprehensive Review: 2026

Related Hematology Tools

CRS Grading

ICANS Grading

aGvHD Grading

NIH Chronic GvHD Scoring

Sickle Cell Disease Risk

Thalassaemia Transfusion Threshold

NTDT Iron Burden Estimator

HbS Percentage Target Calculator

ITP Bleeding Score

IWG ITP Response Criteria

Have feedback about this calculator?Let us know.