Gestational age and size Flashcards
Define gestational age
This is the no. of weeks from the first day of the last period to the day of birth
Define the postconceptional age
This is approximately 2 weeks less than the gestational age
What is the normal range for the gestational age
37-42 weeks
When is an ultrasound an accurate way of estimating the age of a fetus
Less than 20 weeks
What is naegles rule
The month of the last period - 3 months + one year and then the day is 7+ LMP
When does the LMP give an accurate expected date of delivery 2
- If the mother has a regular cycle
- If the mother have an accurate date for the start of LMP
What is the ballord score and when is it used
This is a postnatal assessment that uses 6 neurological and 6 physical assessments to assess the gestational age of the infant
When can the foot length not be used to estimate the gestational age of an infant
When the infant has IUGR
What is the normal range of fetal birth weight
2500-4000gW
What are the causes of symmetrical IUGR 3
- Chromosomal abnormalities
- Teratogens
- Congenital infections
What is asymmetrical IUGR
This is where the infant’s head size is normal but the rest of the body is small
What are the possible causes of asymmetrical IUGR 5
This occurs when there are later insults that limit but do not cut off the fetus’s nutrition supply thus reducing it:
1. Maternal pre-eclampsia
2. Abruptio placentae
3. Maternal chronic hypertension
4. Kidney disease
5. Lupus
What is the normal vital signs for an infant
HR: 120-160
RR: 40-60
Temp: 36.5 - 37.5
What are the 2 main causes of an overweight infant
- Maternal obesity
- Gestational diabetes
What are the possible maternal causes of an underweight infant 3
- Low maternal weight or malnutrition
- Smoking or alcohol
- Hypertension
