Home Pregnancy Tests
Home pregnancy tests can find the
presence of a pregnancy
hormone (called human chorionic gonadotropin, or hCG)
in a sample of urine. If you are pregnant, most tests show a color change or a
symbol shows in the indicator area of the test strip or on the part of the test
What Affects the Test
Reasons you may not be able to
have the test or why the results may not be helpful include:
- Taking the test very early in your pregnancy.
HCG may not be found. In this case, the test kit may show that you are not
pregnant when you really are pregnant. This is called a
false-negative result. If you have drunk a lot of
fluid, your urine may be diluted and this may also cause a false-negative
- Certain things may cause the
test results to show that you are pregnant when you are not pregnant. This is
false-positive result. False-positive results may be caused by reading the test at the wrong time, letting the test equipment get
warm, having protein or blood in the urine, or having hCG hormone in the urine
from some other cause.
- Taking certain medicines, such as chlorpromazine
- Taking fertility medicines that contain human chorionic
- Not reading the result at the right time as shown on
the instructions. If you read the result too early or too late, the color
change may not be accurate, and you will need to retest.