Journal Club Follow up: Interpretation of LP

As we spoke about at Journal Club, there is no standard definition of LP diagnosed SAH. This article makes an attempt to at least make a "rule out" quantification and also provides interesting data to the discussion.

LINK

"The study results suggest that there may be a CSF RBC cutoff value at which one can safely exclude a radiographically detectable SAH. In our study, an RBC count in tube 4 of 500 or less corresponded to a negative predictive value for SAH of 100%. This number was statistically significant and independent of clearance from tube to 4. The sensitivity for SAH in this RBC range was 100%."