AbstractEstimation of gestational age is one of the corner stone of prenatal care. Preterm birth rates are higher in developing countries. Women presenting late in pregnancy poses a great problem in assessing gestational age, even USG may not provide correct estimation. Amniotic fluid near term contains an increased amount of surfactant protein. It accelerates the clotting if added to the blood. Accelerated clotting time (aACT) in amniotic fluid is a simple easy bedside test especially for unreported cases admitted with uncertain gestational length.
Key words: Amniotic fluid; Clotting time; Preterm.