NEGATIVE PREGNANCY TEST
It is a test that measures a hormone called human chorionic gonadotropin (HCG), produced
during pregnancy. It appears in the blood and urine of pregnant women up to 10 days after
How Test Is Performed
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A pregnancy test can be performed using blood or urine. There are two types of pregnancy
* Qualitative, which measures whether the HCG hormone is present or not.
* Quantitative, which measures how much HCG is present.
The blood test is done by drawing a single tube of blood and sending it to the laboratory. You
must wait anywhere from a few hours to more than a day to get results. Proof of human
chorionic gonadotropin (hCG) in urine is usually performed by applying a drop of urine on a
prepared chemical strip and generally produces the result on one or two minutes.
What You Feel During Examination
A urine test involves normal urination into a cup. The serum tests involve drawing blood
through a needle and into a tube. Any discomfort you might feel for the collection of blood
only last a few seconds.
Why Test Is Performed
This test can be done to:
* Determine if you are pregnant.
* Diagnose abnormal conditions that can raise HCG levels.
* Watch the development of pregnancy during the first three months (quantitative test only).
*HCG levels rise rapidly during the first trimester and then decrease slightly.
Abnormal Results Mean
HCG levels should double every 48 hours at the beginning of pregnancy. When these levels
do not rise appropriately may indicate a problem with the pregnancy. Some problems
associated with an abnormally rising HCG level include espontáneoaborto spontaneous
abortion and ectopic (tubal) ectopic pregnancy (tubal).
Extremely high levels of HCG may suggest the presence of a molar pregnancy or more than
one fetus, for example, twins.
The doctor will understand the significance of HCG levels and should discuss this with you.
The urine pregnancy test will be positive only when you have enough HCG in the blood. If you
are in a very early pregnancy and the HCG level is below 25-50 mIU / mL, the test is
If you think you are pregnant, repeat the home pregnancy test or doctor's office.
Webster RA. Reproductive Function and Pregnancy. In: McPherson RA, Pincus MR, eds.
Henry's Clinical Diagnosis and Management by Laboratory Methods. 21st ed. Philadelphia,
Pa: Saunders Elsevier, 2006: chap 25.
Morrison LJ. General Approach To The Pregnancy Patient. In: Marx J, ed. Rosen's
Emergency Medicine: Concepts and Clinical Practice. 6th ed. St Philadelphia, Pa: Mosby
Elsevier, 2006: chap 176.