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Related Experiment Video

Updated: Oct 19, 2025

Point-of-Care Lung Ultrasound in Adults: Image Acquisition

Point-of-Care Lung Ultrasound in Adults: Image Acquisition

Published on: March 3, 2023

Number Needed to Scan: Evidence-Based Point-of-Care Ultrasound (POCUS).

Richard Amini¹, Asad E Patanwala², Hamid Shokoohi³

¹Department of Emergency Medicine, University of Arizona College of Medicine, Tucson, USA.

|September 20, 2021

Summary

This summary is machine-generated.

Point-of-care ultrasound (POCUS) use is growing, but overuse is a concern. The "Number Needed to Scan" (NNS) metric helps clinicians assess POCUS impact and patient benefit.

Keywords:

number needed to treat pocus (point of care ultrasound)point-of-care-ultrasound research in emergency medicine teaching in emergency medicine

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Area of Science:

Point-of-care ultrasound (POCUS)
Medical technology
Clinical decision-making

Background:

Growing clinician interest in POCUS across specialties.
Advancements in ultrasound technology include smaller, user-friendly machines.
Concerns exist regarding potential overuse and misuse of POCUS.

Purpose of the Study:

Introduce and define the novel concept of "Number Needed to Scan" (NNS).
To provide a metric for quantifying the clinical impact of POCUS.
To aid clinicians in judicious POCUS application and patient communication.

Main Methods:

Focused NNS calculations on landmark articles.
Analyzed POCUS impact in three key areas: change in management, safety/accuracy, and missed diagnoses.
Utilized existing literature to derive NNS values.

Main Results:

NNS quantifies the number of POCUS exams required for patient benefit or to prevent adverse outcomes.
Demonstrated NNS application in evaluating POCUS for management changes, safety, and diagnostic accuracy.
Calculated NNS values for specific clinical scenarios based on published data.

Conclusions:

NNS helps clinicians understand and communicate the clinical significance of POCUS.
NNS serves as a tool for responsible POCUS stewardship.
Identifying patients most likely to benefit from POCUS is facilitated by the NNS concept.