HERDOO2 Rule Calculator

Overview

Identifies women with first unprovoked VTE who may be at low recurrence risk after treatment.

Clinical Significance

Women with 0–1 HERDOO2 criteria may be low risk; the rule does not identify a low-risk subgroup of men.

When to Use

• Use as structured clinical decision support when the required data are available and reliable.

How It Is Calculated

• The displayed variables are combined using the published equation, decision rule or weighted point system.

Interpretation

• Women with 0–1 HERDOO2 criteria may be low risk; the rule does not identify a low-risk subgroup of men.

Worked Example

Enter verified patient data in the displayed units; MedicalC applies the published model.

Limitations

• Risk and classification tools can be misapplied outside their validated population.
• Missing, estimated or non-contemporaneous data may materially change the result.

Clinical Pearls

• Document the inputs, units, date and clinical setting with the result.
• Use serial scores only when the same instrument and measurement method are used consistently.

Common Mistakes

• Using the tool without confirming entry criteria.
• Using approximate or incorrectly converted values.
• Treating a prognostic score as a standalone treatment decision.

References

1. Rodger MA et al. BMJ. 2017;356:j1065. — Primary or supporting reference for the implemented model.