meconium
Pronunciation: meh-KOH-nee-um
The first intestinal discharge of a newborn, composed of materials ingested during fetal development.
Full Definition
Meconium is the earliest stool passed by a newborn, typically occurring within the first 24-48 hours after birth. This dark, sticky substance consists of materials the fetus ingested while in the uterus, including epithelial cells, mucus, bile, and amniotic fluid. The presence of meconium in amniotic fluid during labor (meconium-stained liquor) can indicate fetal distress and requires careful monitoring. If aspirated by the fetus or newborn, meconium can cause serious respiratory complications requiring immediate medical intervention.
Usage
Usage note: Often confused with 'meconium aspiration' - ensure context clarifies whether referring to normal passage or pathological aspiration.
In Context
- "The newborn passed meconium within six hours of delivery, indicating normal bowel function." — Newborn assessment
- "Thick meconium was noted in the amniotic fluid, requiring pediatric consultation at delivery." — High-risk delivery notes