• Blood test #1 is done between 10 and just under 14 weeks of pregnancy
• Blood test #2 is done between 15 and just under 21 weeks of pregnancy

The blood tests may be done at any laboratory or hospital.  You do not need to make an appointment but remember to bring the requisition your doctor or midwife gave you.

Use our pregnancy dating tool to find out when to have your blood drawn.  If you miss the first blood test, you may still have the second blood test. It is best to have both when possible. Having both improves the accuracy of the screen result.

Nuchal Translucency (NT) Ultrasound

• NT ultrasound is done between 11 and just under 14 weeks of pregnancy

Depending on your age, medical or obstetrical history, you may be offered a NT ultrasound along with the blood tests.  The NT ultrasound must be done at an ultrasound clinic by a specially trained ultrasound technician or doctor.  The ultrasound looks at the tiny fluid filled space at the back of baby's neck, and is difficult to do accurately. 

NT ultrasound site locations