Enables insulin-like growth factor I binding activity and insulin-like growth factor II binding activity. Involved in several processes, including response to estradiol; response to estrogen; and response to retinoic acid. Located in apical plasma membrane; cytoplasmic vesicle; and extracellular space. Biomarker of hypertension and hypothyroidism. Human ortholog(s) of this gene implicated in obesity. Orthologous to human IGFBP2 (insulin like growth factor binding protein 2). [provided by Alliance of Genome Resources, Apr 2022]