['Comparison of two transfer catheters in an IVF program.', 'Prospective, randomized clinical study.', 'A private tertiary care center for ART.', '66 patients < 38 years of age undergoing IVF and/or ICSI.', 'Patients were randomly assigned to undergo ET using the Tomcat catheter (n = 32) or the TDT catheter (n = 34).', 'Primary outcome measures were implantation and pregnancy rates. Secondary outcome measures were contamination with blood and/or mucus on the tip of the catheter, cramping or patient discomfort, and time required to complete ET.', 'Use of the Tomcat catheter resulted in significantly higher implantation (25.2% vs. 8.4%) and clinical pregnancy rates (47% vs. 14.7%) compared with the TDT catheter. All secondary outcome measures were similar for both catheters.'] Does the choice of embryo transfer catheter affect embryo implantation after IVF?