Abstract: The present disclosure describes methods of determining a treatment protocol for and/or a prognosis for a subject suspected of or at risk of suffering from a neurologic disease or disorder, including such diseases and disorders that involve motor neuron function such as ALS. The methods comprise detecting the presence of a chitinase protein in a biological sample.

Abstract: The present disclosure describes methods of determining a treatment protocol for and/or a prognosis for a subject suspected of or at risk of suffering from a neurologic disease or disorder, including such diseases and disorders that involve motor neuron function. In certain aspects, methods are provided for determining a concentration of a one or more chitinase proteins in a biological fluid sample containing or suspected of containing chitinase protein.