This story has been revised to clarify the tests' different no-call rates.

Over the past year, three different companies in the US have launched noninvasive sequencing-based prenatal trisomy tests, competing furiously for what could be a multi-billion dollar market.

Each company is attempting to grab market share by distinguishing itself from its competitors through various criteria, including test quality, price, turnaround time, and the number of disorders for which the test screens.

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