What are the limitations of the Wood Units Calculator?

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

How does the Wood Units Calculator compare to other Cardiovascular scores?

The Wood Units Calculator 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 Wood Units Calculator free to use?

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

EVIDENCE SYNTHESIS

Clinical Reference Hub

Curated insights • How it Works • Practical Pearls • Evidence Base

CLINICAL INSIGHT

When to Use

Right heart catheterization interpretation
PAH classification and severity assessment
Lung transplant candidacy evaluation (PVR threshold)
Alternative to CGS units; older convention still used widely
Helps clinicians understand traditional reporting

CLINICAL INSIGHT

How it Works

Formula

PAH Severity (Wood Units)

PVR (Wood units)	Classification	Clinical Status
<3	Normal	Normal PVR
3–5	Mild elevation	Borderline PH
5–8	Moderate elevation	Mild-moderate PAH
>8	Severe elevation	Severe PAH
>12	Very severe	Advanced/transplant candidate

CLINICAL INSIGHT

Practical Pearls

Thresholds & Decisions

PVR >6 Wood units usually defines PAH diagnosis
PVR >12–16 Wood units: lung transplant evaluation warranted
Response to acute vasodilator challenge: >20% PVR drop may indicate IPAH
Serial PVR increase despite therapy = disease progression

Clinical Evidence and Methodology

Clinical Reference Hub

When to Use

When to Use

How it Works

Formula

PAH Severity (Wood Units)

Practical Pearls

Thresholds & Decisions

Wood Units Calculator

Clinical Reference Hub

When to Use

When to Use

How it Works

Formula

PAH Severity (Wood Units)

Practical Pearls

Thresholds & Decisions

Clinical Evidence and Methodology

Clinical Reference Hub

When to Use

When to Use

How it Works

Formula

PAH Severity (Wood Units)

Practical Pearls

Thresholds & Decisions

Wood Units Calculator

Clinical Reference Hub

When to Use

When to Use

How it Works

Formula

PAH Severity (Wood Units)

Practical Pearls

Thresholds & Decisions