Mannan binding lectin concentration and risk of miscarriage

Area of Science:

• Immunology
• Reproductive Medicine
• Clinical Chemistry

Background:

• Recurrent miscarriage (RM) is a complex condition with various contributing factors.
• Low concentrations of mannan-binding lectin (MBL) have been linked to RM, but the specific threshold for risk is unclear.

Purpose of the Study:

• To determine the critical serum concentration of MBL below which it becomes a significant risk factor for recurrent miscarriage.
• To evaluate the clinical significance of MBL deficiency in couples experiencing recurrent pregnancy loss.

Main Methods:

• Serum samples from 397 patients with recurrent miscarriage and 376 controls were analyzed for MBL concentrations.
• Statistical analysis was performed to assess the association between MBL levels and recurrent miscarriage risk at various cut-off values.

Main Results:

• A statistically significant association between recurrent miscarriage and low MBL concentrations was observed.
• The strength of this association increased as the cut-off MBL concentration was lowered.
• MBL concentrations less than or equal to 0.1 microg/ml were identified as clinically significant for recurrent miscarriage risk.

Conclusions:

• Mannan-binding lectin (MBL) deficiency, specifically concentrations <=0.1 microg/ml, is a clinically significant risk factor for recurrent miscarriage.
• Genotyping for MBL gene mutations is less sensitive than direct MBL concentration measurement for identifying couples at risk of recurrent pregnancy loss.