Measurement of a pleural effusion volume with point-of-care ultrasonography may be a useful tool for intensivists and is an active area of research in critical care.

Pleural Effusion Volume - Ultrasound Calculator app uses three formulae that have been supported in the literature, and are used commonly in clinical practice:

- Supine patient: Balik and Eibenberger formulae.
- Erect or sitting patient: Goecke formulae.

Pleural Effusion Volume - Ultrasound Calculator app also provides concise information on how to perform pleural effusion measurements.