Differentiating blood tests

The following website explains the difference between the different blood tests (PT, PTT, INR):
http://surgery.about.com/od/beforesurgery/qt/PTPTTINRtests.htm

This makes so much more sense.

I never knew before today that the meninges covered the spine in addition to the brain...

It's so nice to review everything, right before my Neuro/Trauma ICU interview on Thursday!

Sources:

• http://www.nlm.nih.gov/medlineplus/ency/imagepages/19088.htm

Understanding Cancer Scans