Insulin-like growth factor binding protein-1, a quick way to detect amniotic fluid

Area of Science:

• Obstetrics and Gynecology
• Biochemistry
• Diagnostic Medicine

Background:

• Premature rupture of membranes (PROM) detection is critical in pregnancy management.
• Existing diagnostic tests for PROM have limitations.
• Insulin-like growth factor binding protein-1 (IGFBP-1) is significantly more concentrated in amniotic fluid than other bodily fluids.

Purpose of the Study:

• To evaluate a rapid dipstick test for confirming or excluding the presence of amniotic fluid.
• To assess the diagnostic performance of a commercial IGFBP-1 based test for PROM.

Main Methods:

• A multicenter study involving 174 women across six Swedish obstetrics and gynecology departments.
• Evaluation of a dipstick technique using monoclonal antibodies to IGFBP-1.
• Inclusion of women with obvious PROM, without PROM, and with suspected PROM.

Main Results:

• The dipstick test demonstrated 95.7% sensitivity and 93.1% specificity in women with obvious PROM.
• In women with suspected PROM, the test showed 70.8% sensitivity, 88.2% specificity, and a 92% positive predictive value (PPV).
• Forty-four of 46 women with obvious PROM and 27 of 29 women without PROM received accurate test results.

Conclusions:

• The dipstick test for IGFBP-1 is a rapid and effective tool for detecting amniotic fluid.
• The test exhibits high positive predictive value, sensitivity, and specificity.
• This IGFBP-1 test serves as a valuable addition to current diagnostic methods for PROM.