What does OB mean in Laboratory?

This page is about the meanings of the acronym/abbreviation/shorthand OB in the Medical field in general and in the Laboratory terminology in particular.

Occult Blood

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What does OB mean?

Ob, Ob River(noun)
a major river of western Siberia; flows generally northward and westward to the Gulf of Ob and the Kara Sea

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"OB." Abbreviations.com. STANDS4 LLC, 2015. Web. 25 Nov. 2015. <http://www.abbreviations.com/term/31031>.