Placenta Number

Placenta Weight (gm)

Perfusion Time (min)

AIB level (mg/l)

Number of Samples

Concentration Ratio Fetal/Maternal (Mean)

Gradient*

19

359

250

10, 40

13, 13

-

M → F

21

605

60

20

7

1.37

M ↔ F

26

480

140

20, 100, 200

4, 5, 6

1.69, 1.95, 1.44

M ↔ F

12

620

95

5, 10, 40

6, 6, 8

1.19, 1.29, 1.40

M ↔ F

23

576

70

100

7

1.51

M ↔ F

11

799

110

5, 10, 40

4, 2, 5

1.65, 1.49, 1.54

M ↔ F

32

523

285

10, 40

15, 15

-

M → F

33

566

160

10

17

-

M ← F

37

437

80

10

9

1.28

M ↔ F

24

466

20

100

5

1.32

M ↔ F

27

538

60

20

7

1.16

M ↔ F

31

668

30

100

4

1.38

M ↔ F

39

367

90

10

10

1.32

M ↔ F

Mean ± S.E.

539 ± 34

112 ± 22

49 ± 14

8 ± 1

1.44 ± 0.05