This study wants to investigate if ultrasound assisted epidural catheter insertion for labor analgesia is easier and safer to the standard epidural technique.

This study has four specific aims:

1. to evaluate congruity between palpatory technique and ultrasound lumbar evaluation to identify the correct spinal space;
2. to compare between ultrasound evaluation and needle measure of skin-epidural space depth;
3. to compare between longitudinal and transverse ultrasound epidural space depth in obese and normal parturients;
4. to check the reduction of complications and failure rates of epidural analgesia with ultrasound assistance.

Inclusion Criteria:

• all women who request epidural analgesia for labor

Exclusion Criteria:

• all women who present contraindication for epidural analgesia

all women after thirty weeks of pregnancy, experiencing spontaneous or induced labor