What is the recommended patient position during a lumbar puncture?

What is the recommended patient position during a lumbar puncture?

• A. Supine
• B. Prone
• C. Side-lying
• D. Seated

Answer: (C)

Opening the intervertebral spaces by spinal flexion makes a lumbar puncture easier and safer. Positioning the patient in a side-lying posture with the knees drawn up toward the chest flexes the lumbar spine, widening the spaces between the vertebrae and aligning the spine for a midline needle path into the subarachnoid space. This stability reduces movement during needle insertion and helps the clinician access the intended space around L3-L4 or L4-L5, where the spinal cord is not present in adults. While a seated or other positions can be used in some cases, side-lying is preferred because it reliably maximizes access to the lumbar interspaces and supports a straightforward, midline approach.

Opening the intervertebral spaces by spinal flexion makes a lumbar puncture easier and safer. Positioning the patient in a side-lying posture with the knees drawn up toward the chest flexes the lumbar spine, widening the spaces between the vertebrae and aligning the spine for a midline needle path into the subarachnoid space. This stability reduces movement during needle insertion and helps the clinician access the intended space around L3-L4 or L4-L5, where the spinal cord is not present in adults. While a seated or other positions can be used in some cases, side-lying is preferred because it reliably maximizes access to the lumbar interspaces and supports a straightforward, midline approach.