Recurrent first trimester pregnancy loss: revised definitions and novel causes

Area of Science:

• Reproductive Medicine
• Genetics
• Immunology

Background:

• Recurrent pregnancy loss (RPL) impacts 2-4% of couples, with up to 50% of cases having no identifiable cause.
• While fetal aneuploidy contributes, other factors likely cause unexplained RPL, necessitating further research into definitions and diagnostics.

Purpose of the Study:

• To review recent literature (1-2 years) on RPL definitions, diagnostic utility, and novel approaches.
• To improve understanding of RPL causes and diagnostic strategies.

Main Methods:

• Literature review of papers published in the last 1-2 years.
• Analysis of studies focusing on RPL definition, diagnostic paradigms, and novel causes.

Main Results:

• The American Society of Reproductive Medicine has proposed standard definitions for RPL.
• Diagnostic testing now includes male factors and placental function assessments (e.g., VEGF, thrombosis, immunology).

Conclusions:

• Standardized RPL definitions and work-up protocols will enhance research and clinical applicability.
• Investigating novel causes for RPL may reduce the rate of unexplained cases.