"
So what is “BM”? Well, it is definitely an
abbreviation but an abbreviation of what?
In most of the teaching sessions I deliver,
someone in the audience uses the term
“BM” and when asked what “BM” means, I
am usually told “blood monitoring”. I then
follow this with the question “blood monitoring
of what?” and the reply I normally receive is
“glucose”. Actually, that could not be further
from the truth; those of you who were nursing
in the late 1980s and 1990s will remember
a blood glucose test strip called “BM Test
1-44”, in which BM was the abbreviation for
“Boehringer Mannheim”, a pharmaceutical
company that was purchased by Roche in 1997
(Andrews, 1997), and the test has not been used
routinely in practice since around that time.
This means that, by using “BM”, doctors and
nurses across the UK are actually recording in
their clinical notes terms such as “Boehringer
Mannheim 13.6 mmol/L”; what is actually
being recorded is not only an inaccurate
abbreviation but jargon and a meaningless
phrase."
http://www.thejournalofdiabetesnursing.co.uk/media/content/_master/3190/files/pdf/jdn17-2-46.pdf
So the nurse probably meant Blood Monitoring Test.