Is a quantification of the secreted glycoprotein YKL-40  (Chitinase-3-like protein 1) YKL-40 has been associated with asthma, inflammatory disease and cancer progression. The trait is YKL40 measurement (EFO_0004869, an Experimental Factor Ontology id). Also known as: CHI3L1 levels, CHI3L1 measurement, Chitinase-3-like protein 1 levels, Chitinase-3-like protein 1 measurement, YKL-40 levels.