Webster's New World Medical Dictionary

Lou Gehrig’s disease
See 
amyotrophic lateral
sclerosis.
louse-borne typhus
See 
typhus, epidemic.
low blood pressure
See 
hypotension.
low placenta
See 
placenta previa.
lower GI series
A series of diagnostic X-rays of
the colon and rectum, taken after the patient is
given a barium enema. See also 
barium enema.
lower segment cesarean section
See 
cae-
sarean section, lower segment.
low-set ear
See 
ear, low-set.
LP
Lumbar puncture.
LQTS
Long QT syndrome.
LSCS
Lower segment cesarean section.
lubricant
An oily or slippery substance. A vaginal
lubricant may be helpful for women who feel pain
during intercourse because of vaginal dryness.
lues
See 
syphilis.
LUL
Left upper lobe, the top-left lobe of the lung.
lumbago
An older, medically imprecise term
referring to pain in the lower back.
lumbar
Referring to the five lumbar vertebrae,
the disks below them, and the corresponding area
of the lower back. The lumbar vertebrae and their
disks are situated below the thoracic vertebrae and
above the sacral vertebrae in the spinal column and
are surrounded by soft tissues, including ligaments
and large muscles.
lumbar puncture
A procedure in which cere-
brospinal fluid is removed from the spinal canal for
diagnostic testing or treatment. Abbreviated LP. The
patient usually lies sideways for the procedure,
although LPs in infants are often done upright. After
local anesthesia is injected into the small of the
back (the lumbar area), a needle is inserted
between two vertebrae and into the spinal canal.
Spinal fluid pressure can then be measured, and
cerebrospinal fluid can be removed for testing. LP is