 The screening process occurs when the patient requests labor analgesia. The study is then explained to the patient as well as the option of receiving labor analgesia without participating in the study protocol. The epidural catheters will be placed in the usual fashion in the L2-3 interspace. The catheter will be injected with 3ml lidocaine 1.5 with epinephrine 1:200,000 test dose as is the usual practice at Baystate following insertion of all epidural catheters to rule out placement of an intravenous catheter. All catheters will be placed in 5 cm. Following customary test dosing, patients will be given Fentanyl 100 mcg in 10 ml volume. After the woman is comfortable from the epidural, we will again approach the patient. If the patient then agrees to participate in the study and signs the consent form, study procedures are initiated. 