Result is immediate for the scanning part using the ultrasound. But need to wait few days for blood test result. Both result will be combined together.
They took my blood test after the scan, it was not immediate, I know my result the following week
I got a call from the clinic on the results few days after the scan.
https://sg.theasianparent.com/oscar-test-fee-singapore
Takes about 1 to 2 weeks for results to be out.