Used in clinical and research laboratories to measure insulin-like growth factor binding protein 1 (IGFBP-1) levels in human blood or plasma samples. It plays a key role in assessing fetal lung maturity when testing amniotic fluid, helping determine the risk of respiratory distress syndrome in premature infants. The kit is also used in studies related to insulin resistance, metabolic disorders, and pregnancy complications such as intrauterine growth restriction. Its high sensitivity allows for accurate quantification of both phosphorylated and non-phosphorylated forms of IGFBP-1, making it valuable in endocrinology and obstetrics research.