What is a spinal tap test? How is it used in Brain on Fire? A spinal tap test takes fluid from around the brain and spinal cord. It is a diagnostic tool used to help figure out what is and isn’t going on with Susannah Cahalan and her mysterious illness. Read on to understand the answer to the question “what is a spinal tap test?” and how it helped doctors diagnose Susannah.
What Is a Spinal Tap Test Used For in Brain on Fire?










