13. DIAGNOSTIC TESTS for GB Disorders
13.1 ROUTINE ABDOMINAL X-RAYS
Plain films are indicated in biliary
tract disease, since biliary
calculi in upto 20% of cases are
calcified. Gallstones visibility
is denpendent upon the amount of
calcium present in the stone.
Ultrasonography has
been adopted as the principle
diagnostic
test.
13.2 ORAL CHOLECYSTOGRAPHY
After
ingestion of telepaque 12 hours earlier, visualization of
the normal gallbladder takes place.
*
Subsequent to the
ingestion of a fatty meal,
contraction
begins promptly and within 40 minutes, the
gallbladder is
reduced to at least one-third of one-fourth of
its normal
size.
*
An abnormal cholecystogram may demonstrate poor visualization
of the gallbaldder
or presence of filling defects due to
presence of calculi or tumours.
*
Non-visualization may be due to :
* Failure to retain the oral
medication
* Faulty absorption such as with
pyloric obstruction
* Hepatic dysfunction
* Hepatic or cystic duct
obstruction
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