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WOMAN 1 : Unit of O-neg. Is that just short for O negative blood?
Run a cross-and-type match. To check her blood and find suitable donors?
Start an arterial line right away.
And blood gasses.

WOMAN 2: Blood gasses, coming up.
WOMAN 1 : Prep for chest tube now.

WOMAN 2: Chest tube.
WOMAN 1 : Let's go, let's go.
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I don't know why the term is "unit", when we all know it is a "pint" in non-metrical terms.
Comments  
Madhulk WOMAN 1 : Unit of O-neg. Is that just short for O negative blood? That's how I read it. 1 unit could be one bag of blood.
Run a cross-and-type match. To check her blood and find suitable donors? I believe so.
Start an arterial line right away.
And blood gasses.

WOMAN 2: Blood gasses, coming up.
WOMAN 1 : Prep for chest tube now.

WOMAN 2: Chest tube.
WOMAN 1 : Let's go, let's go.

They're probably giving her some O-negative to save her life, while they find a better match for her.
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Thanks, Vorpar!
 Philip's reply was promoted to an answer.
Just found this from a website:

A unit of whole blood is 450 milliliters, which is about 0.9510 U.S. pint. For components of blood, one unit is the amount of that substance that would normally be found in one unit of whole blood. The adult human body contains roughly 12 units of whole blood. Note: although the unit is defined by volume, it is actually measured by mass at blood collection centers. Since the density of human blood is 1.053 kilograms per liter, the mass of a unit of blood is about 474 grams or 16.7 ounces.
Cross-matching is more than just type-matching. See
http://en.wikipedia.org/wiki/Cross-matching

A full cross-matching takes time. In case of emergency, O negative can be given before cross-matching can be completed.
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