Are Systemic Inflammation Markers Reliable for Diagnosing Intrahepatic Cholestasis of Pregnancy? A Retrospective Cohort Study

Problem

This study aims to evaluate the effectiveness of inflammation indexes (systemic immune-inflammation index [SII], systemic inflammation response index [SIRI], pan-immune inflammation value [PIV], and neutrophil-to-lymphocyte ratio [NLR]) in the diagnosis of intrahepatic cholestasis of pregnancy (ICP).

Method of Study

A retrospective study was conducted, reviewing medical records of patients diagnosed with ICP who delivered between October 1, 2022, and May 31, 2023, at the Perinatology clinic of Etlik City Hospital, Ankara. A control group of healthy pregnant women with uncomplicated pregnancies was also included. Demographic data, clinical characteristics, and laboratory results, including systemic inflammation indices and liver enzyme levels, were collected and analyzed.

Results

A total of 242 participants were included, with 121 ICP patients and 121 controls. White blood cell count, neutrophil count, and monocyte count showed significant differences between the two groups (p = 0.011, p = 0.004, and p = 0.039, respectively). Aspartate aminotransferase (AST) and alanine aminotransferase (ALT) levels were significantly elevated in the ICP group (p < 0.001 for both). SII and NLR were higher in the ICP group compared to controls (p = 0.032 and p = 0.010, respectively). Receiver operating characteristic (ROC) analysis revealed moderate predictive values for SII (area under the curve [AUC] = 0.581, p = 0.030) and NLR (AUC = 0.598, p = 0.009), with no significant difference in their predictive power (p = 0.502).

Conclusions

Systemic inflammation indices such as SII and NLR offer a cost-effective and rapid means of diagnosing ICP, potentially complementing or surpassing traditional biomarkers like bile acid levels and liver function tests (LFTs). These indices can be easily integrated into routine clinical practice, providing timely intervention to improve maternal and fetal outcomes. Further research is warranted to confirm these findings and establish standardized protocols for their use in ICP management.