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The inclusion criteria was met when the patient had an amniocentesis for FLM and the first ultrasound in the records had been obtained after 20 weeks gestation. The patients were then divided into four groups (21-25, 26-30, 31-35, >35 weeks of gestation). The data was then analyzed and compared to FLM result to see if late ultrasounds could be used to help predict the outcome of FLM test. Results: A total of 997 records were available, 336 of which met criteria. The average gestational age at time of ultrasound was 33 weeks. We found that when an ultrasound was performed after 20 weeks, the FLM can be predicted with 72% sensitivity and at PPV of 62%. In addition, measurement of an AC >10th and >50th percentile, as well as BPD >50% were statistically significant parameters in predicting a mature FLM result. Conclusions: Ultrasound preformed late in pregnancy may be used to predict fetal maturity at term particularly when abdominal circumference, and biparietal diameter are evaluated. Further studies are needed to validate our findings.

Short oral presentation abstracts reconstruction in coronal section before insertion of Mirena, 14 had expulsion at different time points after insertion. The 2 nd subgroup consisted of 17 women with already occurred expulsion. Results: Upon retrospective analysis of uterine cavity configuration, area and size it was established that IUS expulsion happened in no case with regular triangular shape of uterine cavity, area of uterine cavity 5,6-7,6 cm2 and distance between tubal angles less than 4,5 cm.In 11 patients of the second subgroup with occurred expulsion, different degrees of uterine cavity deformity were noted. The highest rate of expulsions (58,1%) was seen in patients of both subgroups who had distance between tubal angles above 4,5 cm (5,21 ± 0,54 cm) and cavity area more than 9.0 cm 2 (12,78 ± 2,01 cm 2 ) which is significantly different from same characteristics of control group (p < 0,05). There was no difference in mean length of uterine cavity between the groups of carriers and patients with occurred expulsions. Conclusions: The analysis of data allows establishing the advantages of three-dimensional echography in predicting expulsion of IUS Mirena. Patients who are prescribed treatment with Mirena should undergo three-dimensional reconstruction of uterine cavity in coronal section before insertion of Mirena. The probability of expulsion is high in cases of deformities of uterine cavity which can hamper correct placement of IUS, and in cases when the width of cavity between tubal angles is more than 4,5 cm. OP16.07 Comparison of 3D/4D transvaginal ultrasound to 3D saline infused sonohysterography for evaluation of endometrial polypsObjectives: The purpose of this study was to evaluate the accuracy of 3D/4D transvaginal ultrasound (3D/4D TVUS) and SIS for the evaluation of endometrial polyps for women with abnormal uterine bleeding or postmenopausal bleeding. Methods: Between 2009 and 2011, 159 women with abnormal uterine bleeding or postmenopausal bleeding were evaluated with 3D/4D TVUS, SIS, and hysteroscopy. Pathology was obtained from either a dilation and curettage or hysterectomy. Sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV) for TVUS and SIS for diagnosing endometrial polyps were determined. Results: After endometrial polyps were confirmed with histology, the sensitivity and specificity of 3D/4D TVUS for the diagnosis of polyps were 91.3% and 90.9% respectively. The sensitivity and specificity of SIS were 97.3% and 96% respectively. The PPV and NPV for 3D/4D TVUS were 96% and 80%, while the PPV and NPV for SIS were 96.5% and 93%. Conclusions: In this study, we compared the accuracy of TVUS to SIS to diagnose endometrial polyps. Previous studies have analyzed the ability non 3D/4D TVUS to correctly diagnose endometrial polyps. With the advancement 3D/4D technology to ultrasound, the ability to accurately diagnose polyps may eliminate the need for further testing with SIS if the diagnosis is endometrial polyps. OP16.08 Three-dimensional (3D) in v...