Is your husband having any symptoms?
Did the doctor explain to you why she wants to check for MS or cancer in his spinal fluid?
I apologize for taking 12 minutes to provide an answer. I wanted to be sure that it was complete.
The cerebrospinal fluid contains several substances. The brain and spinal cord are bathed in this fluid. A spinal tap that reveals a high nimber of antibodies and oligocolonal bands or certain proteins, can be suggestive of MS. This is how a diagnosis is made or ruled out. However, a "negative" spinal tap does not rule out MS or other diseases. The diagnosis is usually made by combining other diagnostic procedures such as MRI.
Take a look at the websites below and let me know if you find them helpful.