hypo
hypodermic
h.s.
hour of sleep; at bedtime
h
hour
ht
height
hr
hour
hor.
Hour
H
hypodermic
Hx
history
Hg
mercury
HCl
hydrochloric acid
HD
hemodialysis
HRT
hormone replacement therapy
HIV
human immunodeficiency virus
HCTZ
Hydrochlorothiazide
h/o
History of
H2
Histamine 2
H2O
Water
HAART
Highly Active antiretroviral therapy
HR
Heart rate
HTN
Hypertension