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Table 3 Laboratory values and iron therapy in cases and controls

From: The contribution of iron deficiency to the risk of peripartum transfusion: a retrospective case control study

Laboratory measure

N case; N control

Case

Control

Ferritin measured in pregnancy – n (%)

145; 145

101 (70)

102 (70)

Ferritin measured in 1st trimester – n (%)

145; 145

56 (39)

56 (39)

Preconception iron deficiency – n (%)

85; 41

27 (32)

9 (22)

Ferritin < 30 μg/L – n (%)

53; 23

26 (49)

8 (35)

TSAT < 20% – n (%)

2; 1

0 (0)

0 (0)

MCV < 80 fL when previously normal– n (%)

85; 40

2 (2)

1 (3)

Preconception anemia – n (%)

85; 40

15 (18)

8 (20)

Iron deficiency in pregnancy – n (%)

145; 145

72 (50)

62 (43)

Ferritin < 30 μg/L – n (%)

101; 102

64 (63)

59 (58)

TSAT < 20% – n (%)

2; 2

2 (100)

2 (100)

MCV < 80 fL when previously normal – n (%)

145; 131

8 (6)

8 (6)

Anemia in pregnancy – n (%)

145; 145

63 (44)

23 (16)

Iron deficiency anemia in pregnancy – n (%)

145; 145

32 (22)

11 (8)

Lowest hemoglobin in pregnancy - median in g/L (IQR)

145; 145

108 (14)

117 (12)

Lowest ferritin in pregnancy – median in μg/L (IQR)

101; 102

24 (24)

27 (30)

Lowest MCV in pregnancy – median in fL (IQR)

145; 145

87.6 (6.5)

88.2 (5.9)

Postpartum iron deficiency – n (%)

144; 75

14 (10)

5 (7)

Ferritin < 30 μg/L – n (%)

20; 7

7 (35)

0 (0)

TSAT < 20% – n (%)

1; 0

0 (0)

0 (0)

MCV < 80 fL when previously normal – n (%)

144; 74

7 (5)

5 (7)

Postpartum anemia (Hb < 110 g/L up to 6 months)– n (%)

144; 74

142 (99)

39 (53)

Oral iron – n (%)

145; 145

30 (42)

23 (37)

Intravenous iron – n (%)

145; 145

22 (15)

3 (5)

  1. IQR interquartile range, MCV mean corpuscular volume, TSAT transferrin saturation