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lumbar puncture, opening pressure

i just got my lumbar puncture and and my doctor wanted to know what the opening pressure. it was a 7 and i was wondering what that meant??
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How bad is an opening pressure of 40?
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368886 tn?1466235284
MEDICAL PROFESSIONAL
Hi.

This is a normal reading. A normal opening pressure should be less than 18 cm H2O.

Regards
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