Ultrasound Scan Abbreviations: Complete Reference Guide for OB/GYN & General Imaging

Obstetric & Gynecologic Abbreviations

Abbreviation	Full Term	Context
2D / 3D / 4D	Two/Three/Four-Dimensional	Imaging mode (4D = real-time 3D)
AFI	Amniotic Fluid Index	Sum of 4 quadrants; normal 5–25 cm
AC	Abdominal Circumference	Fetal growth parameter
BPD	Biparietal Diameter	Fetal head transverse diameter
CRL	Crown-Rump Length	Dating (6–13 wks)
EDD / EDC	Estimated Due Date / Date of Confinement	Calculated from LMP or CRL
EFW	Estimated Fetal Weight	Formula (Hadlock, etc.) using HC, AC, FL
FL	Femur Length	Long bone growth
GA	Gestational Age	Weeks + days
HC	Head Circumference	Fetal head size
LMP	Last Menstrual Period	Dating reference
NT	Nuchal Translucency	11–14 wks screening
OFD	Occipitofrontal Diameter	Head anteroposterior diameter
IUP	Intrauterine Pregnancy	Confirms location
TVS	Transvaginal Scan	Early pregnancy, adnexal detail
USG	Ultrasonography	General term

Vascular / Doppler

Abbreviation	Full Term
UA	Umbilical Artery
UtA / UA (context)	Uterine Artery
MCA	Middle Cerebral Artery
DV	Ductus Venosus
PI / RI / S/D	Pulsatility Index / Resistance Index / Systolic-Diastolic Ratio

General / Early Pregnancy

• GS = Gestational Sac
• YMS = Yolk Sac
• FH = Fetal Heartbeat (not fundal height)
• CRL = Crown-Rump Length
• PUL = Pregnancy of Unknown Location

Note

Abbreviations vary by machine vendor (GE, Philips, Samsung, Mindray) and institution. Always confirm with local protocol or sonographer.