Sequential Maternal Screening, Part 2, Serum
Testing Algorithm Delineates situation(s) when tests are added to the initial order. This includes reflex and additional tests.
The following are available in Special Instructions:
-Sequential Maternal Serum Screening Testing Process
-Prenatal Aneuploidy Screening and Diagnostic Testing Options Algorithm
Specimen Type Describes the specimen type needed for testing
Specimen Required Defines the optimal specimen. This field describes the type of specimen required to perform the test and the preferred volume to complete testing. The volume allows automated processing, fastest throughput and, when indicated, repeat or reflex testing.
Sequential maternal screening is a 2-part test that includes a first-trimester sample (SEQU / Sequential Maternal Screening, Part 1, Serum) and a second-trimester sample (SEQF / Sequential Maternal Screening, Part 2, Serum). Do not order this test unless you have already ordered test SEQU / Sequential Maternal Screening, Part 1, Serum. If a standalone second-trimester screen is desired, order QUAD / Quad Screen (Second Trimester) Maternal, Serum.
Draw blood between 15 weeks, 0 days and 22 weeks, 6 days. Do not draw blood after performing amniocentesis, as that may lead to an artificially increased serum alpha-fetoprotein level and unreliable results.
Preferred: Red top
Acceptable: Serum gel
Specimen Volume: 1 mL
Collection Instructions: Spin down immediately.
Additional Information: Draw date is required.
Specimen Minimum Volume Defines the amount of specimen required to perform an assay once, including instrument and container dead space. Submitting the minimum specimen volume makes it impossible to repeat the test or perform confirmatory or perform reflex testing. In some situations, a minimum specimen volume may result in a QNS (quantity not sufficient) result, requiring a second specimen to be collected.
Mild OK; Gross reject
Mild OK; Gross OK
Specimen Stability Information Provides a description of the temperatures required to transport a specimen to the laboratory. Alternate acceptable temperature(s) are also included.
|Serum||Refrigerated (preferred)||7 days|