Perinatal Medicine

Question 1

# Define: Term 
Post-term

Answer 1

Term: 37-41 weeks
Post-term: >41 weeks

Question 2

Define: Preterm

Late preterm
Moderate preterm
Very preterm
Extreme preterm

Answer 2

Preterm <37 weeks

Late preterm: 34 - 36+6
Moderate: 32 - 33+6
Very: 28 - 31+6
Extremely preterm: <28 weeks

Question 3

Define:

Low birth weight (LBW)
Very low birth weight (VLBW)
Extremely low birth weight (ELBW)

Answer 3

LBW <2500 g
VLBW <1500 g
ELBW <1000 g

Question 4

Define:

Small for gestational age
Large for gestational age

Answer 4

SGA - birth weight <10th centile for gestational age
LGA - birth weight >10th centile for gestational age

Question 5

Define:

Stillbirth
Neonatal death

Answer 5

Stillbirth - fetus delivered at or after 24 weeks showing no signs of life

Neonatal death - live born baby (at 20 weeks or after, or weight of 400g or more if accurate gestational age not possible), who died before 28 days after birth

Question 6

Define:

Perinatal mortality rate
Neonatal mortality rate
Postneonatal mortality rate
Infant mortality rate

Answer 6

Perinatal mortality rate: stillbirths + deaths within first week per 1000 live births AND stillbirths

Neonatal mortality rate: deaths of live-born infants within first 4 weeks after birth per 1000 live births

Postneonatal mortality rate: number of deaths aged 28 days and over, but under 1 year, per 1000 live births

Infant mortality rate: number of deaths under 1 year of age per 1000 live births (includes neonatal deaths)