Results
PTB
PRETERM BIRTH, PRETERM LABOUR
A total of 49 women with symptoms of TPTL were recruited into the study. One test result was invalid and the patient was excluded from the study, leaving 48 women in the final analysis. Demographic and obstetrics characteristics for the participants were described in Table 
Demographic characteristicsBMI: body mass index; IQR: interquartile range; PTB: preterm birthThe median gestational age of women presenting with TPTL was 29.2 weeks’ gestation (IQR 3.8, range 24 weeks to 33 weeks 6 days). In both groups with PTB vs. term delivery, the majority of patients were of Chinese ethicity (80 vs. 97%) with no statistical difference (p = 0.11). There was a statisical difference in obstetric history between the two groups with 29 (76%) patients in term goup being nulliparous compared with 3 (30%) in preterm group (p = 0.006). There was no statistical difference in history of previous preterm birth in preterm and term group (20% vs. 5% p = 0.13). 21 women were given corticosteroids and tocolytics at the discretion of the attending obstetrician. 9 (42.8% of those receiving corticosteroid) had PTB. 12 (57.1% of those receiving corticosteroid) had term delivery after 37 weeks. Overall, 23 (48%) had vaginal delivery; 25 women (52%) had Caesarean delivery. 10 women delivered before 37 + 0 weeks (21% PTB rate) and 6 of them had spontaneous PTB before 34 + 0 weeks. Out of the 10 women with PTB, 6 had caesarean Sect. (5 for preterm labour with malpresentation and 1 for abnormal cardiotocography and previous Caesarean section). 19 women had Caesarean delivery at term with indications such as previous Caesarean section, malpresentation and maternal request.Concentrations of fFN were obtained for all women with the PeriLynx system. The number of women with results falling within each of the prespecified fFN categories is shown in Table 
Spontaneous preterm birth rate within fetal fibronectin categoriesfFN: Fetal fibronectin, PTB: preterm birthNote: 3 PTB (< 37w) took place > 14 days of testingThe rate of spontaneous preterm birth at 34 weeks’ gestation was associated increasing concentrations of fFN (Table 
The accuracy of fetal fibronectin tests