Clinics and Departments

Laboratory Services

Lab Dept:

Hematology

Test Name:

PREGNANCY TEST, SERUM

General Information

Lab Order Codes:

SHCG

Synonyms:

HCG; pregnancy test; human chorionic gonadotropin

CPT Codes:

84703 – Gonadotropin, chorionic (hCG); qualitative

Test Includes:

Qualitative serum pregnancy test reported as positive or negative.

Logistics

Test Indications:

Useful for the qualitative detection of human chorionic gonadotropin (hCG) to detect pregnancy.

Lab Testing Sections:

Hematology

Phone Numbers:

MIN Lab: 612-813-6280

STP Lab: 651-220-6550

Test Availability:

Daily, 24 hours

Turnaround Time:

1 hour

Special Instructions:

N/A

Specimen

Specimen Type:

Blood

Container:

Red top tube

Draw Volume:

2 mL (Minimum: 1.5 mL) blood

Processed Volume:

Minimum: 0.5 mL serum

Collection:

Routine venipuncture

Special Processing:

Lab staff: Centrifuge specimen, remove serum aliquot into a screw-capped plastic vial. Store at refrigerated temperatures.

Patient Preparation:

None

Sample Rejection:

Unlabeled or mislabeled specimen

Interpretive

Reference Range:

Negative (reported as positive or negative).

Specimens containing as low a level as 25 mIU/mL hCG will yield positive results when tested with Quick Vue One-Step hCG Combo Test. In normal pregnancy, hCG can be detected as early as 6 days following conception with concentrations doubling every 32 to 48 hours, peaking in excess of 100,000 mIU/mL in approximately 10 to 12 weeks. Levels of 25 mIU/mL hCG are reportedly present in urine and serum as early as 2 to 3 days before expected menses. Serum hCG is rapidly cleared into the urine and the concentration of hCG in serum is approximately equal to the concentration in urine.

Critical Values:

N/A

Limitations:

Some instances of a positive urine and negative serum test occur. This is due to hCG breakdown products present in the urine. Repeat the test a week later.

Methodology:

Monoclonal Antibody, Quick Vue One-Step hCG Combo Test

Contraindications:

This test should not be used for tumor markers, order HCG, Beta subunit.

References:

Quidel Quick Vue One-Step hCG Combo Test Kit Package Insert (2002)



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