In preparing a client for a lumbar puncture, which position should the nurse assist them into?

The lateral recumbent position is the most appropriate choice for a client undergoing a lumbar puncture. This position helps to widen the spaces between the vertebrae and allows easier access to the cerebrospinal fluid (CSF) in the lumbar region of the spine. When the patient is in this position, it facilitates proper alignment of the spine, minimizes discomfort, and reduces the risk of complications during the procedure. Additionally, this position can help prevent any potential leakage of CSF post-procedure by keeping the spine in a stable configuration.

In contrast, the supine position may not be ideal as it can lead to increased pressure on the spine and limit access for the procedure. The seated position could introduce discomfort and may not provide optimal access to the lumbar area required for the puncture. Lastly, the Trendelenburg position, which involves tilting the body so that the head is lower than the feet, is not suitable for a lumbar puncture, as it can complicate the procedure and does not provide the necessary spinal alignment. The lateral recumbent position is, therefore, the most effective and safer choice for conducting a lumbar puncture.