Preterm labor (PTL) is defined by WHO as the onset of labor after the age of viability which is from 20 to 28 weeks of gestation and before 37 completed weeks.
True labor refers to regular uterine contractions (at least one every 10 minutes), which are gradually increasing in intensity, frequency, and durationassociated with either cervical dilatation or rupture of fetal amniotic membranes. If cervical change or rupture of the membranes does not occur, a diagnosis of threatened PTL (TPTL) can be made. Fortunately, about 50% and up to 70% of TPTL womendo not deliver preterm and the contractions subside.
Preterm delivery is associated with a significant increase in fetal mortality and morbidity, respiratory problems, high risk of infection, feeding difficulties, visual and hearing weakness, and neurodevelopmental delay. This makes the screening for women at the highest risk of preterm birth and prevention of preterm crucially important.

AIM OF THE WORK:
The aim of this work was to assess the use of different blood parameters and ratios {lymphocytes, monocytes, neutrophils, and platelets count, and platelets lymphocytes ratio (PLR), neutrophils lymphocytes ratio (NLR), and lymphocytes monocytes ratio (MLR)} in prediction of preterm delivery in women with threatened preterm labor.