Establish Reference Intervals of Complete Blood Count for Twin Pregnancy

Background: Twin pregnancy is of high risk, which increased in recent years. Establishment of reference intervals of complete blood count (CBC) for twin-pregnant women during pregnancy might help for the properly prognosis of adverse outcomes in twin pregnancy. Methods: We screened out 253 cases of twin pregnancy reference cohort from 1153 twin pregnancy after the complications and adverse pregnancy outcomes were excluded. Complete blood count data were collected during the mid- and late-term of pregnancy and analyzed by SPSS to establish the reference intervals of peripheral blood of twin pregnancy. Results: The RBC, HGB, HCT, and PLT were lower in twin pregnant women than those in healthy nulligravida women during gestation, while the levels of WBC, NEU, and NEU% increased, especially in the mid-term. The reference intervals of late-term pregnancy validated by using 20 samples of twin pregnancy, then utilized for figuring out the distinctive characteristics of CBC with preterm birth (PTB) pregnancy. Absolutes of WBC and NEU increased in PTB pregnancy using our established reference intervals, implying they might be prognosis indicators of this adverse outcome. Conclusion: Establishing the reference interval of blood cell-related indicators of normal twin pregnancy is helpful for the monitoring and prognosis of PTB.