A lumbar puncture is sometimes called a “spinal tap.” It’s a medical procedure that can involve collecting a sample of cerebrospinal fluid (CSF). CSF is the fluid that surrounds your spinal cord and ...

A lumbar puncture is a test to check the fluid that circulates around the brain and spinal cord. This is called the cerebrospinal fluid or CSF. A lumbar puncture can check for cancer cells or for ...