Amniotic fluid granulocyte colony stimulating factor levels: a rapid marker for diagnosing chorioamnionitis

Area of Science:

• Obstetrics and Gynecology
• Neonatal Medicine
• Infectious Diseases

Background:

• Chorioamnionitis (CAM) is an infection of the amniotic fluid and membranes.
• Accurate and rapid diagnosis of CAM is crucial for maternal and fetal outcomes.
• Current diagnostic methods for CAM have limitations in sensitivity and specificity.

Purpose of the Study:

• To evaluate the diagnostic utility of amniotic fluid (AF) granulocyte colony-stimulating factor (G-CSF) levels for chorioamnionitis (CAM).
• To compare the effectiveness of AF G-CSF with existing clinical and laboratory markers for CAM diagnosis.

Main Methods:

• AF samples were collected from term and preterm patients with and without CAM.
• Patients with other infections were excluded.
• AF G-CSF levels were measured and compared with maternal fever, leukocytosis, AF glucose, white blood cell count, Gram stain, and cultures.

Main Results:

• AF G-CSF levels were significantly higher in patients with CAM (1600-14,000 pg/ml) compared to uninfected controls (400-1600 pg/ml).
• Using a cutoff of 2000 pg/ml, AF G-CSF demonstrated 67% sensitivity, 100% specificity, and 100% positive predictive value for CAM.
• AF G-CSF showed high sensitivity, specificity, and predictive values, outperforming other individual diagnostic parameters.

Conclusions:

• Elevated amniotic fluid G-CSF levels are indicative of chorioamnionitis.
• An AF G-CSF level exceeding 2000 pg/ml is a strong positive predictor of CAM.
• AF G-CSF appears to be a more reliable marker for predicting CAM than currently used single clinical or laboratory tests.