First trimester ultrasound


* Mean diameter = ( length + height + width ) / 3

CL
Corpus luteum
GSD
Gestational sac
YSD
Yolk sac
CRL
Crown-rump length
NT
Nuchal translucency
NT/CRL


Fetal heartbeat


FHR
Fetal heart rate


Fetal biometry

Multiple Pregnancy


CHL
Crown-heel length
BPD
Biparietal diameter
OFD
Occipitofrontal diameter
CI
Cephalic index
HC
Head circumference
AC
Abdominal circumference
APAD
Anteroposterior abdominal diameter
TAD
Transverse abdominal diameter
FL
Femur length
TL
Tibia length
FiL
Fibula length
FoL
Foot length
HL
Humerus length
UL
Ulna length
RL
Radius length
NB
Nasal bone length
NT
Nuchal translucency


Placenta. Amniotic fluid.


PT
Placental thickness
PG
Placental grade
AFI
Amniotic fluid index