All blood from the abdominal area goes through the
portal vein and into the liver, first, before returning to
the heart. The liver filters the blood of toxins and
converts these toxins to a non toxic form, to be
disposed of, by the body, mostly in the urine.
Seeing contusions close to the liver, may mean that
blunt force from the accident could have occurred and
damaged the liver.

The liver cells contain enzymes. When the liver cells
become damaged, these enzymes can be released or
leak out and this is what causes a rise in the blood
work lab tests results. The doctors uses the liver
enzyme blood test to signify if there is cell damage.
These tests are known as the ALT, AST, GGT,
and Alkaline Phosphatase.
They also have another set of tests done to check and
see how well the cells of the liver are functioning to
do over 500 functions that the liver normally does in
a healthy person. These are known as the
Liver Function blood tests....the tests done are
usually the Bilirubin, INR, Albumin, Total Protein,
Pt, and PTT.

I'm a little surprised that they did not, also, order the
Liver blood tests to be done...like I mentioned above.
This is very much separate from the CBC testing.
The CBC, type, crossmatch may be for transfusion
purposes.

To learn more about the tests I mentioned for the
liver:
http://www.labtestsonline.org
Or you can type in Liver Enzymes or Liver Function
tests in your search engine.