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Test Code MSINT1 AFP Maternal Integrated Screen 1

Important Note

This test is run in conjunction with but collected prior to the Integrated Screen 2nd Trimester. Results will not be reported until both samples are sent and received by the State Hygienic Laboratory.

Additional Codes

Epic: LAB2268

Specimen Requirement

2 mL of serum is required.


Reference Values



The maternal integrated screens are screening tests for Down’s Syndrome, Trisome 18 and Open Neural Tube Defects. Results are released after completion of the Integrated Screen 2nd Trimester:

Nucal Translucency (NT), Pregnancy-Associated Plasma Protein-A (PAPP-A), Alpha Feto-Protein (AFP), Estriol, Human Chorionic Donadotropin (HCG) and Inhibin are reported. Also included are the risk assessment for age related Down’s Syndrome, Down’s Syndrome and Trisomy 18. An interpretation and recommended action are also included.


Test performed Monday through Sunday

CPT Information

82105 Chemistry: Alpha-fetoprotein (AFP); serum

82677 Chemistry: Estriol

84702 Other and Unlisted Chemistry Tests: Gonadotropin, chorionic (hCG); quantitative

86336 Diagnostic Immunology Testing: Inhibin a

84163 Chemistry: Pregnancy-Associated Plasma Protein-A (PAPPA)


Quantitative Chemiluminescent Immunoassay

Additional Specimen Collection Instructions

Stage 1 is collected during first trimester, when crown-rump length (crl) is between 32-80 mm. This measurement is required for screening in the first trimester. The Nucal Translucency measured by a certified sonographer during ultrasound is required for first trimester screening.

  1. Collect blood in a plain, red-top tube(s) or serum gel tube(s).
  2. Allow the blood to clot, then centrifuge and remove serum (at least 2 ml) from the tube and transfer to a tube labeled with patient name or unique identifier and date of birth.
  3. Wrap the tube in absorbent material and place in a biohazard bag.
  4. Roll the specimen in the bag and place in a SHL mailer with an “A”-code self-adhesive  wrapper provided.
  5. Ship at ambient temperature.
  6. Unlabeled specimens will not be tested.
  7. Send along with the completed Iowa Maternal Screen Test Request form.
    SHL Iowa Maternal Screen Request Form
  8. The specimen must be received by SHL within 9 days of collection date.

Stage 2 is collected during second trimester; between 15-20 weeks. See Integrated Screen 2nd Trimester for testing.

Useful For

Detection of possible fetal abnormalities due to birth defect or chromosome abnormalities

LOINC Code Information

49085-4 First and Second Trimester Integrated Maternal Screen Panel