Early Antenatal assessment

Question 1

B-hcg

- when detectable

Answer 1

• serum 9/7 post conception

- urine 28/7 after 1st day LMP

Question 2

B-HCG levels and earliest detectable USD findings - TV and TA

Answer 2

TV - 5 wks - >1,500 IU; Fetal sac
- 6wks - fetal pole
- 7-8 wks - feral heart tones
TAb - 6-8wks >6,500; IU pregnancy

Question 3

Dating scan

Answer 3

8-12 wks

Question 4

FTS

Answer 4

Blood (bHCG and PAPP-A) and NTS - 11-13+6wks

Question 5

T2 bloods

Answer 5

AFP, B-HCG, unconjugated oestrogen; 15-18wks

Question 6

Morph scan

Answer 6

18-20wks

Question 7

CVS

Answer 7

12-14wks; 1%abortion risk some fetal limb injury ; TV or Tab; only chromosomal screening. Adv: earlier, faster results.

Question 8

Amniocentesis

Answer 8

> 15wks to term; .5% abortion risk, some fetal limb injury; NTD and chromo abnormalities (more accurate genetic testing than CVS)

Question 9

FTS for >35yo - chromosomal screening for high risks 1:300 T1; 1:250 T2

Answer 9

30yrs -1: 1600
35yo - 1:250/300
37yo - 1:150
40yo - 1/80-100

Question 10

5mg of Folate with

Answer 10

DM
BMI >35
Epilepsy
Prev NTD FMhx, child