Neurology

MGFA Clinical Classification calculator

Enter the published formula inputs below to calculate and interpret this score.

Clinical inputs

Airway intubation

Intubation for myasthenic weakness is class V. Routine postoperative ventilation does not assign class V.

Feeding tube

Weakness of muscles other than the eyes

Class I requires normal strength outside the eyes, including eye closure that may be weak without changing the class. Mild, moderate, and severe describe classes II, III, and IV.

Predominant muscles

Result

3 fields remaining

Anyone can run this calculator. Sign in to save, favourite, or send the result.

Professional use only

For qualified clinicians. Independently verify inputs, calculations, source guidance, and applicability before any clinical action. This calculator does not replace clinical judgment.

Source: Jaretzki A et al. Myasthenia gravis: recommendations for clinical research standards. Neurology. DOI: 10.1212/wnl.55.1.16. PMID: 10891897. Class I is ocular weakness with all other muscle strength normal. Classes II, III, and IV are mild, moderate, and severe weakness of non-ocular muscles; subclass a is predominantly limb or axial and subclass b is predominantly oropharyngeal or respiratory. Class V is intubation for myasthenic weakness, excluding routine postoperative ventilation. A feeding tube without intubation is class IVb. The classification is not an outcome measure. (2000)

Ruqelo is AI and can make mistakes. Check important information.

Clinical inputs

Airway intubation
Feeding tube
Weakness of muscles other than the eyes
Predominant muscles

Primary source

Jaretzki A et al. Myasthenia gravis: recommendations for clinical research standards. Neurology. DOI: 10.1212/wnl.55.1.16. PMID: 10891897. Class I is ocular weakness with all other muscle strength normal. Classes II, III, and IV are mild, moderate, and severe weakness of non-ocular muscles; subclass a is predominantly limb or axial and subclass b is predominantly oropharyngeal or respiratory. Class V is intubation for myasthenic weakness, excluding routine postoperative ventilation. A feeding tube without intubation is class IVb. The classification is not an outcome measure. (2000)

View source