Specimen Requirements
Minimum of 1.0 mL serum; alternately 2.0 mL serum from Red Top tube
Supplies for Submission
SST/Gold Top (1); alternately Red Top (1)
Specimen Collection
Interpretation is available for gestational age of 14 weeks to 24 weeks 6 days, if an accompanying complete history form is submitted.
- Label serum separator tube (SST) with two identifiers. Acceptable identifiers include patient’s name, date of birth, social security number, requisition number, and medical record number.
- Allow SST contents to clot in an upright position for at least 30 minutes (60 minutes for Red Top tube).
- SST specimen - centrifuge within 2 hours of collection and refrigerate.
- Red Top specimen - centrifuge within 2 hours of collection, transfer serum to a plastic transport tube labelled appropriately and as Red Top serum, and refrigerate.
Storage Requirements
Refrigerated.
Specimens are stable if if stored at room temperature for 5 day, refrigerated for 14 days, or frozen for 6 months.
Causes for Rejections
Specimens with the following conditions are not accepted: