Test Overview
Prenatal screening for open neural tube defect (alpha-fetoprotein only), trisomy 21 (alpha-fetoprotein, human chorionic gonadotropin, estriol, and inhibin A) and trisomy 18 (alpha-fetoprotein, human chorionic gonadotropin, and estriol).

Sample Type
Serum

Tube/Container
SST (1)

Submission Container

Specimen Volume

Alternate Specimen
None

Alternate Tube/Container
None

Sample Processing

Special Requirements

Specimen Stability
REFRIGERATE (7 Days)

TAT
5 Days

Methodology
Immunoenzymatic Assay

CPT
81511

Test Aliases
AFP 4 Marker Screen, AFP Maternal Screening, AFP Neural Tube Defects, QUAD, Triple Test, UE3 (Unconjugated Estriol)

Test Overview
Useful for detecting pregnancy and evaluating the approximate date of conception.

Sample Type
Serum

Tube/Container
SST (1)

Submission Container

Specimen Volume

Alternate Specimen
None

Alternate Tube/Container
None

Sample Processing

Special Requirements

Specimen Stability
REFRIGERATE (48 hours)

TAT

Methodology
Immunoassay

CPT
84702

Test Aliases
BHCG Quant, Beta-Human Gonadotropin Quantitative, Beta-HCG, HCG Beta Subunit, Chorionic Gonadotropin Subunit HCG, Chorionic Gonadotropins Beta-Subunit, Human Chorionic Gonadotropins, High-Sensitivity HCG