A positive test resulted in a post-test likelihood of endometrial cancer of 81.7 percent (95 percent CI 59.7 percent –92.9 percent) whereas a negative test resulted in a probability of 0.9 percent (95 percent CI 0.4 percent –2.4 percent). Conclusion Outpatient endometrial biopsy offers a good overall accuracy in identifying endometrial cancer when a sufficient specimen is collected.