This study is a randomized clinical trial to evaluate the accuracy of the novel SAIL technique compared to the classic intercristal line technique in estimating the L4-L5 interspace for labor epidural or spinal anesthesia placement. The investigators hypothesize that the SAIL technique will be more accurate in successfully locating the L4-L5 interspace in pregnant women than the classic intercristal line technique.
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Accuracy, as measured by percentage of estimations that correctly match ultrasound determined interspace
Timeframe: From enrollment to the end of data collection, approximately 15 minutes