A lumbar puncture was taken which didn't show anything.
Examples include lumbar puncture (spinal tap), urine collection, magnetic resonance imaging (MRI), additional blood tests, or electrocardiogram (ECG).
In the case of children under 18 months of age, a lumbar puncture (spinal tap) may be recommended to rule out meningitis because symptoms are often lacking or subtle in children of that age.
CSF is withdrawn from the subarachnoid space through a needle by a procedure called a lumbar puncture or spinal tap.
In some circumstances, a lumbar puncture to withdraw a small amount of CSF for analysis may lead to serious complications.