Ultrasound Discriminatory Sizes
Female pelvis
Normal size of yolk sac: <5.6 mm (6 mm)
-Discriminatory sizes
Should see:
1. Gestational sac (EV) by Beta hcg-1900MIU/ml
2. Fetal heartbeat by CRL>5 mm (EV)
On EV:
Should see:
Yolk sac if MSD> 8 mm
Embryonic pole ifMSD> 16 mm
On Transadbdominal Scan:
Should see:
Yolk sac if MSD> 20 mm
Embryonic pole if MSD> 25 mm
Ovaries:
Normal sizes:
Mean volume Upper limit of normal vol. (cc)
0-3 months 1 4
3 mos-2 years 1 3
Premenarchal (3-15y) 3 9
Menstrual 10 22
Postmenopausal 6 14
>15yrs postmenopausal 2 4
Endometrium:
Premenopausal: >/= 15mm
Postmenopausal
(With bleeding): > 5mm
Postmenopausal
(Without bleeding): > 8mm
Normal size of yolk sac: <5.6 mm (6 mm)
-Discriminatory sizes
Should see:
1. Gestational sac (EV) by Beta hcg-1900MIU/ml
2. Fetal heartbeat by CRL>5 mm (EV)
On EV:
Should see:
Yolk sac if MSD> 8 mm
Embryonic pole ifMSD> 16 mm
On Transadbdominal Scan:
Should see:
Yolk sac if MSD> 20 mm
Embryonic pole if MSD> 25 mm
Ovaries:
Normal sizes:
Mean volume Upper limit of normal vol. (cc)
0-3 months 1 4
3 mos-2 years 1 3
Premenarchal (3-15y) 3 9
Menstrual 10 22
Postmenopausal 6 14
>15yrs postmenopausal 2 4
Endometrium:
Premenopausal: >/= 15mm
Postmenopausal
(With bleeding): > 5mm
Postmenopausal
(Without bleeding): > 8mm