CRB-65 (ambulatorial)
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
CRB-65
About this calculator
The CRB-65 (ambulatory) Calculator is a useful online tool to evaluate the risk of complications in patients with heart or lung disease. The CRB-65 formula is a simplified index, based on four variables: Heart condition (C), Breathing (R), Low blood pressure (B) and Age ≥ 65 years (65).
This calculator was developed to help healthcare professionals make informed decisions about treatment and patient management. It is particularly useful in outpatient settings, where rapid and accurate risk assessment is essential.
Before using the CRB-65 calculator, it's essential to remember that it does not replace clinical evaluation and professional discretion. Additionally, it's crucial to follow common precautions, such as monitoring blood pressure and heart rate, and performing additional tests as necessary.
The CRB-65 calculator is a valuable tool to help prevent complications and improve patient quality of life. It's easy to use and can be accessed anywhere with an internet connection.
Frequently asked questions
What is the CRB-65 formula?
The CRB-65 formula is a simplified index to evaluate the risk of complications in patients with heart or lung disease.
When should I use the CRB-65 calculator?
The CRB-65 calculator should be used in patients with heart or lung disease, particularly in outpatient settings.
What does each variable in the CRB-65 formula mean?
Variable C represents heart condition, R represents breathing, B represents low blood pressure, and 65 represents age ≥ 65 years.
Is the CRB-65 calculator reliable?
The CRB-65 calculator is a valuable tool, but it does not replace clinical evaluation and professional discretion.
How can I use the CRB-65 calculator safely?
To use the CRB-65 calculator safely, it's essential to follow common precautions, such as monitoring blood pressure and heart rate, and performing additional tests as necessary.