Loading...

Human Chorionic Gonadotropin (hCG), β-Subunit, Quantitative CPT: 84702

Special Instructions

This test may exhibit interference when sample is collected from a person who is consuming a supplement with a high dose of biotin (also termed as vitamin B7 or B8, vitamin H, or coenzyme R). It is recommended to ask all patients who may be indicated for this test about biotin supplementation. Patients should be cautioned to stop biotin consumption at least 72 hours prior to the collection of a sample.

Expected Turnaround Time

Within 1 day

Specimen Requirements

Specimen

Serum

Volume

0.8 mL

Minimum Volume

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

Container

Red-top tube or gel-barrier tube.

Collection

If a red-top tube is used, transfer separated serum to a plastic transport tube.

Storage Instructions

Room temperature

Stability Requirements

Temperature Period
Room Temperature 14 days
Refrigerated 14 days
Frozen 14 days
Freeze/thaw/ cycles Stable x 3

Patient Information

To confirm a pregnancy; to help identify an ectopic pregnancy; to monitor a pregnancy that may be at risk of failing; occasionally to screen a woman for pregnancy prior to some medical treatments; as part of a panel of tests used to screen for fetal abnormalities (see First Trimester Down Syndrome Screen and Second Trimester Maternal Serum Screening)

When you suspect that you are pregnant (testing can be done reliably by 10 days after you miss your menstrual period and some methods can detect hCG even earlier); when you have signs and symptoms that suggest you may have an ectopic pregnancy or a pregnancy that is failing; prior to some medical treatments.

A urine sample, preferably collected first thing in the morning, or a blood sample drawn from a vein in your arm.

Do not drink large amounts of fluid before collecting a urine sample for a pregnancy test because overly diluted urine may result in a false negative; no preparation is needed for a blood sample.