Weiniger CF, et al. - Given difficult neuraxial block can be predicted by high body mass index (BMI), however, fat distribution may also be significant, so, researchers investigated body habitus and fat distribution measurements that correlated with ultrasound measured epidural depth in this prospective IRB approved research including term pregnant women needing neuraxial block. They hypothesized a likely better correlation of measurements such as midarm and subscapular fatpad thicknesses and length of cervical spine, with ultrasound measured epidural depth compared with a global measure of BMI. In this study, overall 131 women completed body habitus measurements. They found a significant correlation of measured BMI, subscapular fatpad and midarm fatpad thickness, but not of vertebral column length, with ultrasound depth to epidural space. Experts found that for anticipating greater ultrasound measured depth to epidural space, measurements of body habitus and fat distribution were no better as compared with measured BMI.