Dating of Pregnancy & Testing

Question 1

What are the two different ways of dating a pregnancy?

Answer 1

1. Fertilisation Age

2. Menstrual Age

Question 2

When does the menstrual age date from and how many weeks it it?

Answer 2

Dates pregnancy from last menstrual period. 40 weeks with 3 equal trimesters

Question 3

When does fertilisation age date from and how many weeks is it?

Answer 3

Dates from day of fertilisation. Is 38 weeks with 3 unequal time periods

Question 4

Why is there a difference in weeks between these two methods of dating a pregnancy?

Answer 4

40 weeks of the menstrual age accounts for first 2 weeks of menstrual cycle where a woman cannot conceive

Question 5

What are the 3 time periods of fertilisation age?

Answer 5

1. Early development (ED)
2. Embryonic period (E) (organogenesis)
3. Foetal period (F)

Question 6

What happens during ED?

Answer 6

Rapid cell division, pre-embryonic

Question 7

What happens during E?

Answer 7

Roughly between weeks 3-8 when most of the organs&systems are developed

Question 8

What happens during F?

Answer 8

Systems grow and mature

Question 9

What molecule is tested for during pregnancy tests?

Answer 9

hCG