Measuring the depth to the posterior complex during lumbar neuraxial ultrasound, parasagittal oblique interlaminar view

In the parasagittal oblique interlaminar view, use the caliper function on the ultrasound machine to measure the depth from the skin to the posterior complex (ligamentum flavum, epidural space, and dura). For further detail refer to UpToDate content on neuraxial ultrasound for anesthesia.