If you go to this link
http://www.nlm.nih.gov/medlineplus/ and do a search you will find all the answers you need for the results you have for your LP.
Also, there is a link at the top of the page for PubMed. Click on that and do a search for Lumbar Puncture or Spinal Tap. Lots of good links on this site!!
Normal for MBP is 4.0, FYI.