What is it?
The Double Market Test (or Dual Test), is a biochemical prenatal screening test performed during the 11th and 14th week. It consists in measuring the concentration of free chorionic gonadotropin beta fractions (ßHCG) and of PAPP-A (pregnancy-associated plasma protein) in the mother’s blood and performing an ultrasound scan in order to establish the exact gestational age.
The values of these substances may vary in the presence of foetal chromosomal abnormalities; more specifically, in the case of trisomy 21 an increase in ßHCG and a decrease in PAPP-A can be observed.
The Double Marker Test is usually used to calculate chromosomal risks; when combined with the nuchal fold thickness test, it is known as the Combined Test.
How to make an appointment
Call your preferred centre for an appointment.
Find out more
SISMeR provides its patients with useful information on topics related to infertility and Medically-Assisted Procreation techniques. For this, it has published a series of booklets that are given to patients when they visit their SISMeR Centre.