HomeUltrasound and ImagingViability ultrasound Viability ultrasound A viability ultrasound is used in determining gestational age by measuring the Crown to Rump Length (CRL). This provides the most accurate information for the due date. Viability ultrasound is usually performed at less than 11 weeks. Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to email a link to a friend (Opens in new window)Click to print (Opens in new window)Click to share on LinkedIn (Opens in new window)Click to share on Reddit (Opens in new window)Click to share on Tumblr (Opens in new window)Click to share on Pinterest (Opens in new window)Click to share on Pocket (Opens in new window)Click to share on Telegram (Opens in new window)Click to share on WhatsApp (Opens in new window)Like this:Like Loading...