Sonographer Application To Obtain Prenatal Screening Laboratory NT
Measurement Accreditation
Preliminary Notes:
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The five laboratories that carry out prenatal screening in Ontario for Down Syndrome and other
aneuploidies have begun to apply more stringent quality provisions to the nuchal translucency (NT)
measurements used in the calculation of screen risk. The laboratories now accept the NT
measurements of new sonographers only if they have completed the specific training given by the
Fetal Medicine Foundation (FMF) at www.fetalmedicine.com; and then submitted a total of 15 NT
measurements acquired over the CRL range listed on the pages below. This is to check that the
NT-CRL distribution follows the expected pattern.
For Integrated prenatal screening (IPS), the NT ultrasound will be booked by the referring health
care provider as an IPS ultrasound. The patient should present with a prenatal screening
requisition with the top and bottom sections already filled in. The sonographer will be responsible
for the ultrasound information. The patient then takes the form to any Ontario registered clinical
laboratory for the blood tests, preferably on the same day as the ultrasound but before a
gestational age of 13 + 6 is reached.
For further information regarding the program, you may contact any of the testing laboratories
below:
Credit Valley Hospital: 905-813-4104
North York General Hospital: 416-756-5996
London Health Sciences Centre: 519-667-6592
Mt Sinai Hospital: 416-586-8510
Children’s Hospital of Eastern Ontario: 613-737-7600 extension 3093
Checklist: (make sure you have completed and included the following, and then
fax it back to CHEO laboratory fax number (613) 738- 4819. Do not apply to
multiple sites.)
 the completed application form
 a copy of your FMF 11 – 13 Weeks Scan Certificate of Competence.
Last updated July 2010.
Sonographer Name: ___________________________________________________
Work Address: (please make sure to also indicate the name of the centre(s) you
work at)
____________________________________________________
_____________________________________________________
Phone number: ____________________________________________________
Fax number: ____________________________________________________
e-mail address: ____________________________________________________
Name of MD department head/quality advisor: ____________________________
(please print clearly)
Name:________________________________
FMF#:________________
NUCHAL TRANSLUCENCY (NT) DATA TABLE:
Please complete the following table. As you can see, we require 15 NT measurements
in total spanning the gestational age range between a CRL of 41 mm to 84 mm. Please
remember that the CRL is the best image CRL, not necessarily the same image that
gives you the best NT. You will be contacted once these data are reviewed. Sometimes,
you might be asked to provide some additional NT/CRL measurements to facilitate the
assessment for registration.
CRL 41mm-55mm
NT measurement (mm)
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CRL 55 mm-62 mm
NT measurement (mm)
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2.
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5.
CRL 63mm-70 mm
NT measurement (mm)
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2.
3.
4.
CRL 71 mm-84 mm
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2.
3.
NT measurement (mm)