oxytocin challenge test


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oxytocin

 [ok″se-to´sin]
a hypothalamic hormone stored in and released from the posterior pituitary; it may also be prepared synthetically or obtained from the posterior pituitary of domestic animals. It acts as a powerful stimulant to the pregnant uterus, especially toward the end of gestation, and also causes milk to be expressed from the alveoli into the lactiferous ducts during breastfeeding. Injection of oxytocin may be used to induce labor or strengthen uterine contractions during labor, to contract uterine muscle after delivery of the placenta, and to control postpartum hemorrhage. It must be administered with care to avoid trauma to the mother or infant by hyperactivity of uterine muscles during labor. Oxytocin also may be administered intravenously by slow drip or applied to the mucous membranes of the nasal cavity to be absorbed into the bloodstream.
oxytocin challenge test (OCT) a type of contraction stress test to assess placental reserve for transmitting oxygen to the fetus and detecting insufficiency by observing the fetal heart rate response to oxytocin-induced contraction. See also fetal monitoring.

oxytocin challenge test

a contraction stress test accomplished by administration of intravenous dilute oxytocin solution to stimulate contractions.

ox·y·to·cin chal·lenge test

(ok'si-tō'sin chal'ĕnj test)
A contraction stress test accomplished by administration of intravenous dilute oxytocin solution to stimulate contractions.
Synonym(s): contraction stress test.