Variable

Score

1) Endometrial thickness (a, b, c)

Thickness a: <7 mm

1 point,

b: 7 - 10 mm

2 points

c: ≥11 mm

3 points

2) Endometrial morphology

Type A: immature trilaminar endometrium with three distinct zones of

hyperechoic outer and inner layer and hypo-echoic dark parenchyma*

2 points

Type B: preovulatory trilaminar endometrium, with iso-echoic parenchyma*

3 points

Type C: over-mature, hyper-echoic endometrium with loss of the three zone structure

1 point

3) Pulsatility Index of Uterine Arteries (UAPI) (mean value of both uterine arteries)

Degree 1: PI: <2

2 points

Degree 2: PI: 2 - 3

3 points

Degree 3: PI: >3

1 point

4) Vascularity of myometrium-vascularisation of endometrium

Grade 1: vessels detectable only in the outer half of the myometrium

1 point

Grade 2: vessels detectable throughout the myometrium

2 points

Grade 3: vessels detectable up to the basal membrane of the endometrium or within the endometrium

3 points