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Beta-HCG blood test - quantitative Article
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Beta-HCG blood test - quantitative hcg-in-blood-serum-qualitative
Definition
A quantitative human chorionic gonadotropin (HCG) test measures the specific level of HCG in the blood. HCG is a hormone produced during pregnancy.
See also: Qualitative HCG test
Alternative Names
Serial beta HCG; Repeat quantitative beta HCG; Human chorionic gonadotrophin blood test - quantitative; Beta-HCG blood test - quantitative; Pregnancy test - blood - quantitative
Why the Beta-HCG blood test - quantitative is Performed
HCG appears in the blood and urine of pregnant women as early as 10 days after conception. Quantitative HCG measurements can precisely predict the age of the fetus.
This test is also done to diagnose abnormal conditions that can raise HCG levels.
How the Beta-HCG blood test - quantitative is Performed
Blood is drawn from a vein, usually on the inside of the elbow or the back of the hand. The puncture site is cleaned with antiseptic, and an elastic band is placed around the upper arm to apply pressure and restrict blood flow through the vein. This causes veins below the band to swell with blood.
A needle is inserted into the vein, and the blood is collected in an air-tight vial or a syringe. During the procedure, the band is removed to restore circulation. Once the blood has been collected, the needle is removed, and the puncture site is covered to stop any bleeding.
How to Prepare for the Beta-HCG blood test - quantitative
No special preparation is necessary.
How the Beta-HCG blood test - quantitative Will Feel
When the needle is inserted to draw blood, some people feel moderate pain, while others feel only a prick or stinging sensation. Afterward, there may be some throbbing.
Risks
Possible risks from any blood test include:
- Excessive bleeding
- Fainting or feeling lightheaded
- Hematoma (blood accumulating under the skin)
- Infection (a slight risk any time the skin is broken)
- Multiple punctures to locate veins
Considerations
Drugs that can decrease HCG measurements include diuretics and promethazine.
Drugs that can increase HCG measurements include anticonvulsants, anti-parkinsonian drugs, phenothiazine, and promethazine.
Veins and arteries vary in size from one patient to another and from one side of the body to the other. Obtaining a blood sample from some people may be more difficult than from others.
Normal Results
HCG levels rise rapidly during the first trimester of pregnancy and then slightly decline.
What Abnormal Results Mean
Higher-than-normal levels may indicate:
- Choriocarcinoma of the uterus
- Hydatidiform mole of the uterus
- Normal pregnancy
- More than one fetus -- for example, twins or triplets
- Ovarian cancer
- Beta-HCG blood test - quantitativeicular cancer (in men)
Lower-than-normal levels may indicate:
- Fetal death
- Incomplete miscarriage
- Threatened spontaneous abortion
- Ectopic pregnancy
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