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Test ID: 1STT    
First Trimester Maternal Screen

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Test Classification Provides information regarding the medical device classification for laboratory test kits and reagents. Tests may be classified as cleared or approved by the US Food and Drug Administration (FDA) and used per manufacturer's instructions, or as products that do not undergo full FDA review and approval, and are then labeled as an Analyte Specific Reagent (ASR), Investigation Use Only (IUO) product, or a Research Use Only (RUO) product.

This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the U.S. Food and Drug Administration.

CPT Code Information Provides guidance in determining the appropriate Current Procedural Terminology (CPT) code(s) information for each test or profile. The listed CPT codes reflect Mayo Medical Laboratories interpretation of CPT coding requirements. It is the responsibility of each laboratory to determine correct CPT codes to use for billing.

81508-Fetal congenital abnormalities, biochemical assays of two proteins (PAPP-A, hCG [any form]), utilizing maternal serum, algorithm reported as a risk score

LOINC® Code Information Provides guidance in determining the Logical Observation Identifiers Names and Codes (LOINC) values for the order and result codes of this test.

Test IDTest Order NameOrder LOINC Code
1STTFirst Trimester Maternal ScreenIn Process


Result IDTest Result NameResult LOINC Code
26428Recalculated Maternal Serum Screen43995-0
26411Collection Date33882-2
26412Maternal Birthdate21112-8
26429Calculated Age at EDD43993-5
26413Maternal Weight29463-7
26880Maternal Weight29463-7
IDD_Insulin dependent diabetes44877-9
B_RCEBlack race21484-1
DT3Scan Date34970-4
NUMFNumber of Fetuses55281-0
CRL1CRL Measure 111957-8
CRL2CRL Measure 211957-8
CHORChorionsIn Process
26430GA on Collection by U/S Scan11888-5
NT_BNT Twin B48803-1
26434Down Syndrome Screen Risk Estimate43995-0
26435Down Syndrome Maternal Age Risk49090-4
26436Trisomy 18 Screen Risk Estimate43994-3
26438Additional Comments55107-7
26439Recommended Follow UpIn Process

LOINC and CPT codes are provided by the performing laboratory.