Until now the scan only privately in Edinburgh and the Lothians, around 250 pound price.
The test is offered to all pregnant women in the area for the reduction of the number must be the subject of more risky amniocentesis procedure.
Women will be offered of the Nuchal Translucency test when they are between 11 and 14 weeks pregnant.
The scan measures the fluid is placed under the skin on the back of the baby's neck, which together with blood tests, increases the detection rates of 60% to 80%.
Health officials said it would be half the number of references for the test of amniocentesis, which carries a risk of spontaneous abortion and is linked to a needle is inserted in a pregnant woman in the stomach.
Until now only pregnant women in the part of Glasgow and in Ayrshire and Arran Health Board area has been proposed of Nuchal Translucency test for free.
Miscarriage riskOver the next two months Nuchal screen will be implemented in each area in Scotland.
Dr. Graham McKenzie, Nhs Lothian consultant in public health, said: "the investigation may involve difficult choices and you want to make sure that we offer women the best possible services.
"This Combined screening test is more accurate than the previous test and will reduce the need to offer women additional diagnostic tests, which increase the risk of spontaneous abortion."
Pamela Hamilton, 31 of Edinburgh is 14 weeks pregnant with her second child and recently had a Combined test.
Ms. Hamilton, said: "they are pregnant is very exciting, but there are worries.
"My husband" and "should be preferred to have this test, so that we can learn for the well-being of our baby and yourself prepare for all eventualities."
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