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KCE reports vol. 6A Prenatale zorg 189
Study Ref Population Intervention Outcomes Results Comments Study
type
Tunon et
al., 1996
Backe and
Nakling,
1994
Blondel et
al., 2002
4 [55] 14,167 pregnant
women in
Norway from
1987 to 1992
4 [54] 1341 pregnant
women in
Norway from
1988 to 1989
4 [56] 44,623 births in
Canada from
1978 to 1996
Ultrasound examination at 18
weeks of gestation compared to
LMP for prediction of date of
delivery. LMP only used if
reliable and menstrual cycle was
regular
Ultrasound performed before 20
weeks of gestation compared to
LMP for prediction of term birth
date
Comparison of 6 algorithms to
assess gestational age
1: LMP
Prediction of day of
delivery for term birth
(282 days)
Prediction compared to
actual day of delivery for
term birth (280 days)
Rates of preterm and
post-term births (< 32, 34,
and 37 weeks and º 41 and
Proportion of women who
delivered within 1 week of
prediction for term: 61% for
ultrasound and 56% for LMP
calculation
Proportion of women who
delivered within 2 weeks of
prediction for term: 88% for
ultrasound and 84% for LMP
calculation
Estimated number of post-term
births: 4.1% for ultrasound and
9.8% for LMP,
p < 0.001
Ultrasound prediction was closer
to actual day of delivery, p = 0.03
Proportion of women who
delivered within 2 weeks of
prediction for term: 87.5% for
ultrasound and 79.3% for LMP
calculation, chi 2 = 33, p < 0.001
Delivered more than 2 weeks after
predicted date: 3% with ultrasound
estimation and 13.9% with LMP,
chi 2 = 103, p < 0.001
At < 37 weeks:
1. 7.6%
2. 7.8%
EL
CH 2b
CH 2b
CH 2b