Pelvis

Ultrasound

<3 mm (distended), <5 mm (non-distended)

Normal Value

Measure when bladder is full for accuracy. Plane: Transverse or sagittal

<30 cc (approx. <20–25 g)

Normal Value

Volume = L × W × H × 0.52. Plane: Transrectal or transabdominal

7.5 × 4.5 × 3.0 cm

Normal Value

Size varies with parity/age. Plane: Longitudinal and transverse

<5 mm (postmenopausal, no HRT); 7–14 mm (reproductive phase)

Normal Value

Depends on menstrual cycle phase. Plane: Sagittal uterine plane

<10 cm³

Normal Value

Volume = L × W × H × 0.523. Plane: Transvaginal or transabdominal

<5.8 cm³

Normal Value

Plane: Transvaginal or transabdominal

Measurement	Normal Value	Comments
Bladder wall thickness	<3 mm (distended), <5 mm (non-distended)	Measure when bladder is full for accuracy. Plane: Transverse or sagittal
Prostate volume	<30 cc (approx. <20–25 g)	Volume = L × W × H × 0.52. Plane: Transrectal or transabdominal
Uterus size (nulliparous)	7.5 × 4.5 × 3.0 cm	Size varies with parity/age. Plane: Longitudinal and transverse
Endometrial thickness	<5 mm (postmenopausal, no HRT); 7–14 mm (reproductive phase)	Depends on menstrual cycle phase. Plane: Sagittal uterine plane
Ovarian volume (premenopausal)	<10 cm³	Volume = L × W × H × 0.523. Plane: Transvaginal or transabdominal
Ovarian volume (postmenopausal)	<5.8 cm³	Plane: Transvaginal or transabdominal