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Beaumont Laboratory

HCG Qualitative, Pregnancy Serum

Human Chorionic Gonadotropin, Serum Qualitative, Beta Subunit Human Chorionic Gonadotropin, Serum Qualitative, hCG, Qualitative Serum (Pregnancy Test), Antrim #17279, EPIC: LAB5067, SOFT: HCGS2

Instructions

Serum qualitative hCG specimens should ONLY be collected from EC and inpatients at the Troy Hospital Campus. Specimens should NOT be collected at any other Beaumont Laboratory drawsite or Outreach office.

Specimen Collection Criteria

Collect: One Gold-top SST tube. (Minimum Whole Blood: 4.0 mL)

Contact the Laboratory for acceptability of other tube types.

Rejection Criteria

  • Plasma specimens.
  • Red-top tubes with serum not separated from cells within two hours of collection.

Storage

Specimen Stability for Testing:

Centrifuged SST Tubes and Microtainers® with Separator Gel
Room Temperature (20-26°C or 68-78.8°F): 2 hours
Refrigerated (2-8°C or 36-46°F): 48 hours
Frozen (-20°C/-4°F or below): Unacceptable

Red-top Tubes and Microtainers® without Separator Gel
Room Temperature (20-25°C or 68-77°F): 2 hours
Refrigerated (2-8°C or 36-46°F): Unacceptable
Frozen (-20°C/-4°F or below): Unacceptable

Serum Specimens (Pour-Overs)
Room Temperature (20-26°C or 68-78.8°F): 2 hours
Refrigerated (2-8°C or 36-46°F): 48 hours
Frozen (-20°C/-4°F or below): 1 year

Specimen Storage in Department Prior to Disposal:

Refrigerated (2-8°C or 36-46°F): 7 days

Laboratory

Troy Hematology Laboratory.

Performed

Sunday - Saturday, 24 hours a day.
STAT results available within 1 hour of receipt in the Laboratory.
Routine results available within 4 hours of receipt in the Laboratory.

Reference Range

Negative.

Test Methodology

Chromatographic Immunoassay.

Interpretation

  • This assay measures free Beta subunits plus intact Beta-hCG. The hCG detection limit is 10.0 mIU/mL.
  • Positive findings by this method will be confirmed and reported as quantitative serum hCG, Total Beta.
  • hCG results should be evaluated in relation to the clinical findings of the patient and the results of other diagnostic tests. Rarely, hCG levels may appear consistently elevated due to the presence of heterophilic antibodies or to nonspecific protein binding. If the hCG level is inconsistent with clinical evidence, results should be confirmed by an alternate hCG method.
  • A single negative pregnancy test cannot absolutely rule out pregnancy. After ovulation and conception, the embryo moves through the fallopian tube and implants into the endometrium. Ovulation usually, but not always, occurs at the end of the second week (14 days) of the menstrual cycle. Conception may precede detection of HCG by as much as 1 week. Assuming a regular 28 day menstrual cycle:
    • Using a qualitative serum HCG assay (sensitivity 10.0 mIU/mL) the lab can diagnose 100% of pregnant patients by day 22-25.
    • Using a quantitative serum HCG assay (sensitivity 2.0 mIU/mL) the lab can diagnose 100% of pregnant patients by day 21.
  • Therefore, a negative HCG result within the 7 day window between ovulation and implantation would not rule out pregnancy, regardless of HCG test used.

Clinical Utility

This assay aids in the diagnosis of pregnancy.

CPT Code

84703.

Test Codes

Antrim #17279, EPIC: LAB5067, SOFT: HCGS2

Last Updated

11/14/2016

Microtainer® and Vacutainer® are registered trademarks of Becton, Dickinson and Company.
UroVysion® is a registered trademark of Abbott Laboratories. ThinPrep® is a registered trademark of Hologic, Incorporated.

This directory currently reflects information only for specimens collected and/or processed at the Farmington Hills, Grosse Pointe, Royal Oak, and Troy campuses.