![]() ![]() Naegele’s rule assumes a standardized 28-day menstrual cycle with fertilization occurring on day 14. The date of the last known menstrual period will give the approximate start date for age of the fetus 1). This will approximate the estimated delivery date. From this date, add 1 year and 7 days, then subtract 3 months. Naegele’s Rule: Establish the date of the last menstrual period by obtaining a history from the patient. Prenatal Techniques Non-Sonographic Methods for Determining Gestational Age A high birth weight is more than 8.8 pounds. Infants weighing more are considered large for gestational age (LGA).A low birth weight is less than 5.5 pounds. Infants weighing less are considered small for gestational age (SGA).The weight for full-term infants that are born appropriate for gestational age will most often be between 2,500 grams (about 5.5 lbs or 2.5 kg) and 4,000 grams (about 8.75 lbs or 4 kg). Appropriate for gestational age babies have lower rates of problems and death than babies that are small or large for their gestational age. If the baby’s gestational age findings after birth match the calendar age, the baby is said to be appropriate for gestational age (AGA). After birth, gestational age can be measured by looking at the baby’s weight, length, head circumference, vital signs, reflexes, muscle tone, posture, and the condition of the skin and hair.This provides a view on how well the baby is growing in the womb. Before birth, your health care provider will use ultrasound to measure the size of the baby’s head, abdomen, and thigh bone.Gestational age can be calculated before or after birth. The neuromuscular maturity examination is completed within 24 hours after delivery.Ībbreviations: AGA =appropriate for gestational age LGA = large for gestational age SGA = small for gestational age How to calculate gestational age The physical maturity part of the examination is done in the first 2 hours of birth. The Dubowitz/Ballard Examination evaluates a baby’s appearance, skin texture, motor function, and reflexes. A baby’s gestational age often can be closely estimated using this examination. If they’re more developed, they might be cared for in a special care nursery (SCN).Īn examination called the Dubowitz/Ballard Examination for Gestational Age is often used. This means they’ll be cared for in a neonatal intensive care unit (NICU). For example, most babies who are born at less than 32 weeks of pregnancy will need help with breathing. During this time, the baby grows and develops inside the mother’s womb.Įxact gestational age is important because premature babies won’t be as developed and will probably need more medical support for their lungs, hearts, tummy and bowels, temperature control and feeding. Gestation is the period of time between conception and birth. Infants born after 42 weeks are considered postmature. Infants born before 37 weeks are considered premature. A pregnancy is now considered “full term” at 39 weeks. A normal pregnancy can range from 38 to 42 weeks. Gestational age is measured in weeks, from the first day of the woman’s last menstrual cycle to the current date. Gestational age is the common term used during pregnancy to describe how far along the pregnancy is. Gestational age is the age of a fetus or baby that starts on the first day of the mother’s last menstrual period (LMP). How is neuromuscular maturity assessed?.How is large for gestational age diagnosed?.Why is large for gestational age a concern?.Treatment of babies who are small for gestational age.Why is small for gestational age a concern?.Sonographic Methods for Determining Gestational Age.Non-Sonographic Methods for Determining Gestational Age.
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