MGFA class + MG-ADL (myasthenia severity)
MGFA clinical classification with the MG-ADL scale (Jaretzki 2000; Wolfe 1999): assigns the myasthenia gravis class I-V (with a/b ocular vs generalized subtype) and the 0-24 MG-ADL symptom score.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Maximal weakness severity
- Severe generalized — Class IV
- Subtype
- b — oropharyngeal/respiratory-predominant
- MG-ADL: breathing
- 2 — moderate
- MG-ADL: swallowing
- 2 — moderate
- MG-ADL: talking
- 1 — mild
Result: MGFA Class IVb -- severe generalized weakness, oropharyngeal/respiratory-predominant; MG-ADL at least 5/24 from the 3 of 8 items rated (the other 5 not rated, each worth up to 3).
The tool opens with these values already filled in. Replace them with your own.
What the result means
- Class
- I (ocular only), II (mild), III (moderate), IV (severe), V (intubation); subtype a (limb/axial-predominant) or b (oropharyngeal/respiratory-predominant) on Classes II-IV.
- MG-ADL
- eight items (talking, chewing, swallowing, breathing, hygiene, rising from a chair, double vision, eyelid droop), each 0-3; total 0-24, higher is more severe.
What you enter
- Maximal weakness severity
- Subtype (a limb/axial, b oropharyngeal/respiratory)
- MG-ADL: talking
- MG-ADL: chewing
- MG-ADL: swallowing
- MG-ADL: breathing
- MG-ADL: brushing teeth / combing hair
- MG-ADL: rising from a chair
The other 2 fields
- MG-ADL: double vision
- MG-ADL: eyelid droop
How this is calculated
Jaretzki A 3rd, Barohn RJ, Ernstoff RM, et al. Myasthenia gravis: recommendations for clinical research standards. Neurology. 2000;55(1):16-23; with the MG-ADL of Wolfe GI, et al. Neurology. 1999;52:1487-1489. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.