Whitelily,
Just to share with you what I have posted on the December thread on the DS Scan.
1)Nuchal Translucency (aka NT Test)
WHY: to look for indications of chromosomal disorders, such as Down's Syndrome.
HOW: During an ultrasound scan, the thickness of the fluid-filled area at the back of the foetus's neck (aka as NT)is measured. This reading is combined with thee mother's age to give a risk rating
WHEN: 11 - 14 WEEKS
ROUNTINE: yes
RISK: none
ACCURACY: 60 - 70%
2)Triple Blood Test
WHY: to look for indications of Down Syndrome and neural tube defects, such as spina bifida
HOW: a sample of your blood is drawn. Level of alpha-fetoproteins are measured, along with other 3 proteins markers. These levels are combined with your age to give a risk rating
WHEN: 16 - 21 weeks
ROUNTINE: Offered but not rountine
RISKS: none
ACCURACY: 70%
3)Amniocentesis (aka chou yang sau)
WHY: to look for abnormalities and neural tube defects like spina bifida
HOW: a fine needle is passed through your abdomen into the womb and a sample of the amniotic fluid is taken. Result in 2 - 3 weeks time
WHEN: from 16 weeks
ROUNTINE: no. done on high risk women assessed through screeinng test Women above 35 years of age at delivery. At 35, the risk of DS is 1:350
RISKS: Miscarriage risk of 0.5%
ACCURACY: 99.9%
Oscar would be a combination of both Scan and blood test which usually cost around $300+ to $400. The test is optional but encouraged to take. Cheers
Always been a greedy bear bt after i am pregnant restrict myself quite abit scare will harm bb if i anyhow eat. 
