Test Catalog

Test ID: 1STT1    
First Trimester Maternal Screen, Serum

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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 instructions, or as products that do not undergo full FDA review and approval, and are then labeled as an Analyte Specific Reagent (ASR) 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 Clinic Laboratories interpretation of CPT coding requirements. It is the responsibility of each laboratory to determine correct CPT codes to use for billing.

CPT codes are provided by the performing laboratory.


LOINC® Information Provides guidance in determining the Logical Observation Identifiers Names and Codes (LOINC) values for the order and results codes of this test. LOINC values are provided by the performing laboratory.

Test IDTest Order NameOrder LOINC Value
1STT1First Trimester Maternal Screen49086-2


Result IDTest Result NameResult LOINC ValueApplies only to results expressed in units of measure originally reported by the performing laboratory. These values do not apply to results that are converted to other units of measure.
26428Recalculated Maternal Serum Screen43995-0
601798Results Summary50679-0
26434Down Syndrome Screen Risk Estimate43995-0
26435Down Syndrome Maternal Age Risk49090-4
26436Trisomy 18 Screen Risk Estimate43994-3
601515PAPP-A MoM76348-2
601516THCG MoM32166-1
601517NT MoM49035-9
NT_BNT Twin49035-9
601518NT Twin MoM49035-9
26439Recommended Follow Up80615-8
26438Additional Comments48767-8
26411Specimen Collection Date33882-2
26412Maternal Date of Birth21112-8
26429Calculated Age at EDD43993-5
26413Maternal Weight29463-7
26880Maternal Weight29463-7
IDD_Insulin dependent diabetes44877-9
B_RCEPatient Race21484-1
SMKN1Current cigarette smoking status64234-8
DT3Scan Date34970-4
CRL2CRL Twin11957-8
26430GA on Collection by U/S Scan11888-5
NUMFNumber of Fetuses55281-0
CHORNumber of Chorions92568-5
PRHXPrev Down (T21) / Trisomy Pregnancy53826-4
INTL1Initial or repeat testing86955-2
SONONSonographer Name49088-8
SONOCSonographer CodeNo LOINC Needed
SONODSonographer Reviewer ID49089-6
DRPH1Physician Phone Number68340-9