Enables insulin-like growth factor binding activity. Involved in aging and intracellular signal transduction. Predicted to be located in extracellular region. Predicted to be part of insulin-like growth factor ternary complex. Predicted to be active in extracellular space. Biomarker of congenital diaphragmatic hernia. Orthologous to human IGFBP5 (insulin like growth factor binding protein 5). [provided by Alliance of Genome Resources, Apr 2022]