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KCE reports vol. 6A Prenatale zorg 199
Study Ref Population Intervention Outcomes Results Comments Study type EL
Taipale et al., 4 [553] 6428 women Transvaginal Number of 287/6428 (4.5%)
CH 2b
1997
with singleton ultrasound women with had placenta at
pregnancies from performed at 12 placenta at or or over internal
an obstetric clinic to 16 weeks. over internal os
in Finland from Placenta that cervical os at 12
1993 to 1994 extended over to 16 weeks 10/6428 (0.16%)
the internal
had placenta
cervical os was Number of praevia at time of
measured with women with birth
electronic placenta praevia
calipers at birth 8/10 women with
placenta praevia
Sensitivity were identified
with transvaginal
scan: sensitivity
80%, 95% CI 44
to 98
Taipale et al.,
1998
4 [554] 3696 women
with singleton
pregnancies in
Finland from
1995 to 1996
Transvaginal
ultrasound
performed at 18
to 23 weeks.
Distance from
edge of placenta
to internal
cervical os was
Number of
women with
placenta at or
over internal
cervical os at 18
to 23 weeks
Number of
women with
In all 8 of these
women, the
placenta
extended 15mm
or more over the
internal os
at 12 to 16
weeks
57/3696 (1.5%)
had placenta at
or over
internal os
5/3696 (0.14%)
had placenta
praevia at time of
birth
CH 2b