Popularizing summary Retained products of conception (RPOC) occur when tissue remains in the uterus after a miscarriage, abortion, or delivery, most commonly after early pregnancy loss. Symptoms include unusual bleeding, pelvic pain, and sometimes infection. Diagnosing RPOC can be difficult. Ultrasound is the first test used, but Doppler imaging (which shows blood flow) and hysteroscopy (where a small camera is used to look inside the uterus) can give more accurate results. Treatment options include waiting to see if the tissue passes naturally, taking medication, or surgery. Waiting is recommended for women without symptoms, while medication or surgery is suggested if symptoms persist. Surgery, carries risks such as infection or scarring. Letting the body clear the tissue naturally can help mothers avoid surgery, so it could be beneficial to identify which women might be good candidates for this approach. This study aims to find out which factors can help predict the natural expulsion of this tissue. This study looked at patients from a clinical trial and observational study on RPOC treatment. Between April 2015 and June 2022, 38 patients had the tissue pass naturally, while 313 had surgery to remove it. Patient data, including background and RPOC characteristics, were analyzed to find factors predicting natural expulsion. Statistical tests compared these two groups, and models were created to identify key predictive factors. The study compared two groups of patients to find any factors that might affect the likelihood of the RPOC passing spontaneously. Both groups were compared on factors like patient characteristics, information on their last pregnancy, symptoms, and ultrasound findings. Women that had the RPOC pass spontaneously were comparable to women that required intervention to remove the RPOC. After analyzing the data, three significant factors linked to the likelihood of spontaneous expulsion of RPOC were identified: the size of the tissue seen on an ultrasound, a thicker uterine lining (seen during a procedure called diagnostic hysteroscopy), and the absence of a heartbeat in the embryo for pregnancies that ended in the first trimester. Although other factors—such as breastfeeding, history of miscarriage, symptoms, and body weight—weren't strongly linked in this study, they could still play a role in how the body handles RPOC. While the study’s findings are limited by a small sample size and missing data on certain elements (like hormone levels), the results are consistent with previous research. Further research with more participants is recommended to help guide medical decisions and improve care options. Social outreach Research on predicting when RPOC might naturally be expelled offers significant benefits for both patients and healthcare providers. By identifying factors that indicate when RPOC will resolve without surgery, this study can lead to less invasive, more patient-centered care. One major benefit is the reduced need for surgery. With better predictions, unnecessary surgical procedures can be avoided, lowering the risks of infections, scarring, and long-term fertility issues. Fewer surgeries also mean lower healthcare costs, as there would be less need for operating rooms, recovery care, and treatments for complications. Another key benefit is emotional well-being for patients. Miscarriage or early pregnancy loss is already a difficult experience, and avoiding surgery can help reduce additional stress and trauma. This less invasive approach also allows for improved decision-making by doctors, who can offer more informed, personalized treatment options based on the likelihood of spontaneous expulsion. This is beneficial for the trust and communication between patients and their healthcare providers. Ultimately, fewer surgeries and complications lead to better overall health outcomes. Women experience fewer physical and emotional distress, and their fertility and overall health are preserved. In summary, this research could lead to safer, more cost-effective care, improve patient outcomes, and reduce emotional distress for women, benefiting both individual patients and the healthcare system.