It is indeed interesting to know if an ALS patient condition is stable or deteriorating. Until 2018 there was little known biomarkers for ALS. Thanks to analysis of the ALS database PRO-ACT, scientists learned that some common biomarkers may indicate how a patient situation is evolving.
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Predicting functional decline and survival in amyotrophic lateral sclerosis.pdf
README.md
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README.md

ALS-biomarkers

Better biomarkers of ALS could enable smaller and more targeted clinical trials. Partially to address this aim, the Prize for Life foundation collected de-identified records from ALS sufferers who participated in clinical trials and made them available to researchers in the PRO-ACT database.

PRO-ACT data was used to predict decline in ALS-FRS over the next 9 months with accuracies exceeding chance and clinicians’ predictions and achieving root mean squared errors of ~54% (which is not so good).

Mei-Lyn Ong, Pei Fang Tan and Joanna D. Holbrook [0] attempted to build models to better predict decline in the ALSFRS-R score and to predict survival. They applied learning algorithms to the demographic, clinical and laboratory parameters in the training set to predict ALSFRS-R decline and the derived fast/slow progression and high/low death risk categories. They say their error in prediction is better than 20%.

What is interesting is that they published their results in 2017 in a comprehensive manner and it is possible to use them to provide information to guide a treatment from a reduced set of common biomarkers.
// Alkaline phosphatase
// Albumin
// Creatine Kinase
// Weight
// Chloride
// Bicarbonate
// Gamma Glutamyl Transferase
// Pulse
// Bilirubin

http://padiracinnovation.org/ALS/

[0] Ong M-L, Tan PF, Holbrook JD (2017)
Predicting functional decline and survival in
amyotrophic lateral sclerosis. PLoS ONE 12(4):
e0174925. https://doi.org/10.1371/journal.pone.0174925