Blood samples collected will be shipped to the sponsor's laboratory to establish analytical performance characteristics of the ADVIA Centaur® Pregnancy Associated Plasma Protein A (PAPP-A) and ADVIA Centaur® Free Beta Human Chorionic Gonadotropin (Free βhCG) assays.

Blood samples are to be collected from pregnant women attending their scheduled 1st Trimester scan; the samples are to be collected immediately after the subject's routine blood sample at the clinic visit. No extra venepuncture will be required.

Blood samples collected will be shipped to the sponsor's laboratory to establish analytical performance characteristics of the ADVIA Centaur® Pregnancy Associated Plasma Protein A (PAPP-A) and ADVIA Centaur® Free Beta Human Chorionic Gonadotropin (Free βhCG) assays.

Inclusion Criteria:

• A subject is considered eligible for participation in the trial if all of the following inclusion criteria are satisfied prior to enrolment:

  1. Subject is ≥ 18 years of age
  2. Subject is informed and has been given ample time and opportunity to think about her participation and has given her written informed consent.
  3. Women with a structurally normal viable pregnancy with a fetal crown rump length of 45-84 mm

Exclusion Criteria:

• A subject is not eligible for participation in the trial if any of the following exclusion criteria are met prior to enrolment:

  1. Subject is unable to give consent
  2. Subject has already participated in the study

First trimester pregnancy