TETRA

Maternal Serum Screening (AFP Tetra)

EPIC Test Procedure Code: LAB3353

Synonyms:
Quad Screen
Performing Lab:
Referral Laboratory
Patient Preparation:

1. THIS TEST IS ONLY PERFORMED ON PATIENTS WITH GESTATION AGES BETWEEN 15.0 - 21.9 WEEKS.
2. Specimens must be collected before amniocentesis.

Required Patient Info:

Patient information may be provided to the laboratory using the Request for Maternal Prenatal Screening form 0900: 

 

THE FOLLOWING INFORMATION IS REQUIRED FOR PROCESSING:

1.  Gestational Age
2.  Date on which the patient was the stated gestational age
3.  How gestational age was determined (LMP, EDD, US)
4.  Patient's weight
5.  Patient's date of birth
6.  Patient's race (white, black, other)
7.  Insulin-dependent diabetic status
8.  Indicate relevant patient history (e.g. prior neural tube defects, Down syndrome, ultrasound anomalies, or previous maternal serum screening specimen during this pregnancy)

Container Type:
Serum gel tube
Specimen Type:

Serum

Preferred Volume:
5 mL
Minimum Volume:
3 mL
Specimen Processing:

Send the specimen in the original tube. Pour off is not advised.

Store and Transport:
Room Temperature
Stability:

Frozen - 14 days
Refrigerated - 14 days
Room temperature - 7 days

Unacceptable Condition:

Specimens that are grossly hemolyzed or grossly lipemic will be rejected.

CPT Codes:

MAAA 81511 - AFT Tetra Profile (EAP 30021024)

Method:
Chemiluminescent Immunoassay
Reference Ranges:

Please refer to the performing lab report for applicable reference ranges
Notes:

This is a screening test for open neural tube defects (detects 80% open spina bifida and 90% anencephaly), Down syndrome (detects 75% to 80%), and trisomy 18 (detects 73%).

Lab Personnel

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