Accuracy of self-reported gestation estimation in women presenting for abortion, NHS Fife

Dr Carolyn Ford, consultant O&G; Dr Emily Hennah, clinical fellow, both NHS Fife Gynaecology

Background: Telemedicine - Use of technology; Increases access; Employs triage system; Generally safe and effective

Staff sometimes question whether women will accurately self-report gestation.

 Study: Our region looked  retrospectively at the accuracy of self-reported gestation in women presenting for abortion.

We compared LMP reported on referral with scan gestation.

Results: 112 women self-referred in 1 month.

On referral:

71% gave LMP to nearest day/week

24% gave to week/fortnight

5% uncertain of LMP

On scan:

5% not pregnant

90% <12/40

5% >12/40

Accuracy of estimation (not pregnant excluded):

77% accurate to nearest week and further 8% accurate to nearest 2 weeks (total 85%).

5% had not known LMP – all <12/40

10% underestimated gestation – median 18 days.