The blood urea has been examined in 106 cases
which include cases of appendicitis, saplingitis,
cholecystitis, puerperal sepsis, various abscesses,
peritonitis, intestinal obstruction, pneumonia,
empyema and pleural effusion. It was also examined
in four cases of myelaemia.
Urea concentration tests were performed to
The blood urea is raised in some cases of all
of these conditions except cholecystitis and
uncomplicated salpingitis. It is markedly raised
in intestinal obstruction, in pneumonia before the
crisis, and in general peritonitis when there is
a paralytic ileus.
The rise in blood urea, however great it may be,
is always associated with perfectly normal urea
concentration tests, and therefore it is not due
to a failure of the kidneys to concentrate urea.
An examination of the blood urea may have
considerable diagnostic importance in abdominal
cases, and a reading over 100 mgrs. per 100 cc. is
strongly in favour of intestinal obstruction. A
urea concentration test should always be performed
as well as estimating the blood urea, especially
when a question of uraemia is involved.
The blood urea is no guide as to whether an
abscess or empyema has developed or not.