Superiority of Epidural Placement Technique Using EpiFaith Syringe

Inclusion Criteria: * Females 18 years of age and older at screening * Request labor epidural analgesia * Able to give informed consent to participate in the study * American Society of Anesthesiologists (ASA) class Ⅰ to Ⅲ health status * BMI ≤ 40 kg/m2 Exclusion Criteria: * BMI \> 40 kg/m2; any contraindication to neuraxial anesthesia (coagulopathy, uncorrected hypovolemia, increased intracranial pressure, or local skin infection) * Cardiac disease history, marked spinal deformity, previous spinal surgery, or impalpable anatomical landmarks * Any allergy to bupivacaine or fentanyl