Wilbert-Itzel et al identified factors associated with spontaneous onset of labor in a woman with suspected prelabor rupture of the membranes. These can help identify a woman who is likely to deliver within 24 to 48 hours after presentation. The authors are from Soder Hospital and Karolinska University in Stockholm.
Parameters:
(1) lactate concentration in vaginal fluid
(2) visible amniotic fluid
(3) gestational age in weeks
Outcomes:
(1) spontaneous onset of labor within 24 hours
(2) spontaneous onset of labor within 48 hours
Parameter
Approx OR from MVA for SOL in 24 Hours
Approx OR from MVA for SOL in 48 Hours
lactate concentration in mmol/L >= 4.5 mmol/L
14
29
visible amniotic fluid
4
3
gestational age in weeks >= 39 weeks
NA
3
where:
• OR = odds ratio; MVA = multivariate analysis; SOL = spontaneous onset of labor
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