Pregnancy Test, Urine

CPT: 81025
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Synonyms

  • hCG, Urine
  • Human Chorionic Gonadotropin (hCG), Qualitative, Urine

Expected Turnaround Time

Within 1 day


Related Information


Related Documents


Specimen Requirements


Specimen

Urine (first morning)


Volume

1 mL


Minimum Volume

0.5 mL (Note: This volume does not allow for repeat testing.)


Container

Plastic urine container


Collection

Deliver specimen to the laboratory immediately following collection.


Storage Instructions

Refrigerate


Causes for Rejection

Gross contamination with blood or bacteria; specimen older than 48 hours from date and time of collection


Test Details


Use

Confirmation of pregnancy; normal or ectopic (latter is best done by the more sensitive type assay such as ICMA); evaluation of threatened abortion, trophoblastic tumors, support for the diagnosis of testicular tumors, ectopic hCG production by nontrophoblastic tumors


Limitations

Five-minute immunoenzymetric assay: sensitivity − 20 mIU/mL (The test will normally become positive by the seventh day after menstruation fails to occur.) Proteinuria or hematuria may affect the performance of the test. Interpret specimens with these conditions cautiously. False-positive and false-negative results may also occur in specimens from individuals taking a variety of drugs. Urines from patients on methadone replacement therapy >100 mg/day have demonstrated a high incidence of false-positive reactions when using this test. If this condition is suspected and a positive test results, the test should be repeated using a different methodology. False-positives may also be reported with ectopic production of hCG and/or hCG-like substances by trophoblastic or nontrophoblastic neoplasms (eg, ovarian cysts, testicular tumors, carcinoma of the lung). Positive results from patients suspected to have elevated concentrations of pituitary gonadotropins such as LH should be interpreted with caution although cross reactivity is minimal. Positive tests are also found with various types of choriocarcinoma and hydatidiform mole. A complete abortion may result in a positive test for a week following the procedure.


Methodology

Enzyme immunoassay (EIA)


Reference Interval

Negative


LOINC® Map

Order Code Order Code Name Order Loinc Result Code Result Code Name UofM Result LOINC
004036 Pregnancy Test, Urine 2106-3 004036 Pregnancy Test, Urine 2106-3

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