What are the normal endometrial thickness measurements postpartum (after delivery)?

There are no official guidelines to assist in answering this question. I will search for relevant research papers instead.

From the Research

Normal Endometrial Thickness Postpartum

The normal endometrial thickness measurements postpartum can vary depending on the time frame and individual factors.

• Studies have shown that the mean endometrial cavity measurement can range from 1.1 to 1.15 cm within 48 hours of delivery 1, 2.
• A systematic review and meta-analysis found that the upper limit of normal (95th percentile) for endometrial thickness decreases over time, from 25 mm by 7 days postpartum to 9 mm at 6 weeks postpartum 3.
• The presence of echogenic material in the endometrial cavity is a common finding in asymptomatic postpartum women and is not associated with bleeding complications 1, 2.
• Endometrial thickness measurements can be influenced by factors such as parity and mode of delivery, but these differences are not significant in the postpartum period 1, 2, 3.

Key Findings

• Endometrial thickness measurements within 48 hours of delivery: 1.1-1.15 cm 1, 2
• Upper limit of normal (95th percentile) for endometrial thickness at different time points postpartum:
  • 7 days: 25 mm 3
  • 14 days: 18 mm 3
  • 4 weeks: 12 mm 3
  • 6 weeks: 9 mm 3
• Presence of echogenic material in the endometrial cavity is a normal variant in asymptomatic postpartum women 1, 2