The quadruple test is a screening for Down Syndrome and is usually performed if you have missed the nuchal scan earlier in your pregnancy.
It’s called the quadruple test because it measures four substances in your blood to calculate a Down Syndrome risk. The test is not invasive and does not harm you or your baby but it cannot be performed if you are an insulin dependent diabetic.
If you have already had either the nuchal scan or combined test and have received a high risk result we recommend that you consider a diagnostic test like a CVS or amniocentesis rather than having another screening test.