THe white count does seem a little high. I assume her cells are normal?
I think the doctor is right to want to check the CSF (cerebro-spinal fluid). I've had a lumbar puncture done and wile it's not a lot of fun, it was also no big deal. They also did a liver biopsy on me a few days later, that was less fun.
But none of it would have been ordered if the doctor hadn't thought it was necessary.
A spinal tap is done by pushing a needle into the sub-dural space between the vertebrae in your spine. An epidural anasthetic is given outside this space, just a little. But for the patient, it feels much the same.
The brain and spinal cord are bathed in fluid (CSF) which is all held in by a tough, somewhat flexible membrane called the dura mater (or just dura).
Because a lumbar puncture (aka spinal tap) requires the dura to be punctured, the CSF can leak out the hole. The needle goes in, carefully, and the doctor can feel as soon as the dura is punctured - it really is tough. The patient is either on their tummy or on their side for this. The needle sits there and a few drops of CSF ooze out and are collected. Usually only a few mls are taken. If the colour is normal (straw-coloured, like normal blood serum) this is a good sign. This fluid should be completely clean, completely sterile. But if you're really ill it can contain some bugs which the docs really need to know about. You do NOT want bugs in the fluid in which your brain and spinal chord are being bathed!
The CSF can take a while to get fully analysed - it depends on what tests the docs want. But some answers will begin coming back within hours. Some may take weeks.
After a lumbar puncture, it's a bit like after an epidural - they want you to stay still and lie flat for a while, to help that dura puncture heal. They will ask you to drink more fluids, to replace what they took. If you don't replace what they took you could get a headache (low CSF pressure) which feels a lot like a hangover, I'm told. When they did mine I already had a bad headache (I had all the symptoms of meningitis, actually) so I felt no worse. When your body replaces the fluid, any headache will be gone.
It really is no big deal, when you weight it up against the high white count and the doctor's concern. The chances of anything going wrong are fairly remote - they are easy to do. Just let them book you into hospital for the day and take a good book. Enjoy being waited on hand and foot for a few hours. Lord knows we don't get the chance often!
Marg