evap line clear blue pregnancy test

Positive or just Evap line? - June 2018 - BabyCenter AustraliaWhat to do about a line of evaporation in a pregnancy test We include products that we believe are useful to our readers. If you buy through links on this page, we can win a small commission. Making a pregnancy test can be a nervous irritation experience, especially when it is difficult to understand what the test lines mean. A test can show a small streak where the positive line should be. This is called the evaporation line. A line of evaporation does not indicate pregnancy. If this type of estreak appears, it usually means that a person has read the results too late or misused the test. For most women, getting a precise result simply means taking another test. Some women do pregnancy tests too early to receive accurate positive results. It may be a good idea to wait a few days before taking another test. A line of evaporation is a light streak that appears where the positive line should be in a pregnancy test. Evaporation lines are colorless stripes, not weak lines. They usually appear if a person waits longer than the suggested time to read the test result. A evaporation line may also appear if the test is wet. A line of evaporation does not indicate that a woman is pregnant. These lines often occur when a person has checked the result too late or has taken the test incorrectly. When a evaporation line appears, it is better to take another test for a precise result. Evaporation lines only appear in tests that show negative results. A positive test would change the color in the same place, loosening the evaporation line. If a person sees a line of evaporation, it means the test is negative, or it was taken too early in the pregnancy to show a positive result. Pregnancy begins when a fertilized egg implant in the lining of the uterus. The body then begins to produce a hormone called . HCG levels of the body increase rapidly during the first quarter, usually double each. At the end of the first quarter, hCG levels fall. Home pregnancy tests work by detecting hCG levels during the first trimester of pregnancy. Tests that can detect hCG in the urine are more likely to show positive results before. HCG levels are very low in the days immediately before and after the first lost period. In addition, these levels may vary from woman to woman in early pregnancy. Some naturally have lower levels than others. Compounds in home pregnancy tests interact with hCG, and a positive result will often be seen as a line, a point or a more sign. Most tests also have lines that indicate that the tests are working. Only urine containing a sufficient level of hCG can cause the test dye to stain in a way that shows a positive result. In early pregnancy, there may be very little HCG in the urine, and the positive line may be weak. Even a weak positive line has color, and this distinguishes it from a line of evaporation, which is colorless. Any coloring on a positive line indicates a woman is pregnant. Some pregnancy tests promise to detect pregnancy 5 or more days before a lost period. Although they can often, the test effectiveness depends on the level of hCG in the urine. According to , the average concentration of HCG in urine at 9 days after — about 5 days before a lost period — is 0.93 international milliliters per milliliter (mIU/ml). Most early pregnancy tests can only detect hCG when it rises to 25 mIU/ml or higher levels, which usually occurs around the 11th day. By day 14, hCG levels are typically around 137 mIU/ml. For some women, however, they can be as low as 45 mIU/ml. Because hCG increases so quickly in the early days of pregnancy, the day of malnovation in 1–2 days may affect the result of a pregnancy test. A woman who thinks she's on the 11th day can often expect an exact result, but if she's actually on the 9th, the test may not be able to accurately detect pregnancy. False negatives are more common than false positives. If the result is negative, it may be a good idea to take another test in a few days, to give the hCG levels the opportunity to climb. Very few medicines, including fertility medications, can cause false positives. Otherwise, a positive result followed by a negative result a few days later could mean a very early pregnancy loss. A mark on a pregnancy test can be a line of evaporation if:If the line of control in the test does not change the color, this means the test has failed. A line in a pregnancy test can show a positive result if: Evaporation lines are likely to appear if a woman has not followed the instructions in the test packaging. To avoid evaporation lines: The concentrations of urine hCG are often higher when a person wakes up. Doing a test the first thing in the morning can increase the chances of an early positive result. Expecting the results of a pregnancy test can be agonizing. A simple way to help ensure accuracy is to take two tests. If both show a line, even a weak one, the result is likely positive. Anyone who is not sure of the results should give hCG levels time to get up and take another test in a few days. This can reduce the risk of false negatives. A doctor can provide the most accurate results by testing the blood or urine. Home pregnancy tests are available for purchase in many pharmacies and . Last medical review on July 31, 2018Most recent newsRelated Coverage

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