Advisable to do scan first followed by double marker on the same day. These are screening tests for downs syndrome. And are time specific. If you miss double marker, then either triple or quadruple marker can be done.
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Disclaimer : The content is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding your medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read on this website.
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