hi Gie,
Whether or nt necessary to go thru Oscars , i tink depends on the gynae. For those older school of thought gynae, only do triple test(blood test) and measurement. Also my fren who is only 27, gynae also ask her to do the Oscars which cost more but accuracy is 90%. Cost more also....
However, there are also young mummies who dod the oscars but shows high risk. so hv to do amnio which is 100% accurate but carries 0.5% of risk of miscarriage.
U have to see which u are more comfortable as for us, we want 100% sure. Moreover yr gynae may be very confident tat u do nt need, may due to yr age? hw old are u ?