| Female usually wants to make it clear whether she is pregnant or not after vita sexualis as soon as possible. The emergence of novel and convenient early pregnant indicator paper brings great convenience to the female. It is really convenient that pregnancy can be diagnosed through urine without going to hospital.
Indicator paper is so effective mainly because of its sensitivity. human chorionic gonadotrophin £¨ HCG £© as a specific hormone which can be discovered in the seventh day of pregnancy is tested in uric pregnancy test in hospital customarily. Currently, the early pregnant indicator paper on sale is applied in quick test to HCG in urine sensitively.
Generally, there are two results of test in early pregnant indicator paper employment. We may conclude that it is not pregnancy when urine drops into the detect hole on the indicator paper and a red or blue colored strip appears on the control part. On the contrary, a significant colored strip on the detect part suggests the positive test result and pregnancy can be concluded. It is instant, convenient, sensitive and highly specific, and consensual reaction caused by other glycoprotein hormones whose chemical structure similar to HCG can also be avoidable. However, indicator paper can only be applied in self preliminary screening.
In order to obtain an accurate test result, there are cautions in indicator paper employment as following. Firstly, indicator paper should be applied before expiry date. If it is excessively long time, more than one year or incorrectly reserved in environment with heavy dampness and higher temperature than in room, the indicator paper could be invalid and result in false negative when in application. Secondly, HCG usually is at a lower level in the case of eccyesis or at the beginning of pregnancy. The test sample should be standing for more than 3minutes, generally for mere 1minute in common case, and identified carefully to make sure whether there is positive weak test result. Because colored strip is quite unclear in these two cases.
Thirdly, in some extreme cases, such as acephalocystis racemosa, chorioepithelioma, HCG is at an excessively high level, but negative test result could be yielded in uric test on the contrary.
Fourthly, negative or weak positive result sometimes also could be yielded in uric test after 3 months of pregnancy, because of the declining level of HCG.
Fifthly, positive result does not mean absolute pregnancy. Because some cells of tumors such as acephalocystis racemosa, chorioepithelioma, bronchial carcinoma and renal carcinoma can also secrete HCG. Furthermore, positive result also could be yielded in the case of endometrial hyperplasia.
Woman at child-bearing age whose pregnancy can not be concluded by a single indicator paper test. This merits our vigilance. For the purpose of security, test should be conducted again in 3 days. Certainly, the most reliable way for pregnancy examination is going to hospital and having an overall examination, particularly for the one who has a weak positive test result. Then effective measures could be adopted timely. |
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