Defining safe criteria to diagnose miscarriage: prospective observational multicentre study.

Objectives: To validate recent guidance changes by establishing the performance of cut-off values for embryo crown-rump length and mean gestational sac diameter to diagnose miscarriage with high levels of certainty. Secondary aims were to examine the influence of gestational age on interpretation of mean gestational sac diameter and crown-rump length values, determine the optimal intervals between scans and findings on repeat scans that definitively diagnose pregnancy failure.)

Design: Prospective multicentre observational trial.

Risk factors for obstetric admissions to the intensive care unit in a tertiary hospital: a case-control study.

Objective: The objective was to review all obstetric admissions to the intensive care unit (ICU) at the Royal Free Hospital, London, UK, and to identify the risk factors for obstetric admissions to the ICU.

Method: We carried out a retrospective case-control study. The cases consisted of women admitted to the ICU during pregnancy and up to 42 days postpartum between 1 January 1993 and 31 December 2003.