HIV antibody test 这个是说30天可以排除百分之95了！！
http://www.squidoo.com/HIV-Window-PeriodHIV antibody test & Window period
An HIV antibody test will provide an HIV status at that point in time, EXCEPT if the person taking the test has been exposed and is still within what is called the window period - before seroconversion.
Usually this seroconversion occurs in the first month, but only some people will experience cold or flu-like symptoms that will clear up. So often there is no outward indication of HIV exposure.
For this reason, if using HIV antibody screening, you should wait for at least 1 month, or have two tests, one test 1 month after risk or exposure, and a second test 2 months after risk or exposure.What does the window period mean to me? So how long do I have to wait?
I want to make it clear in this lens, I am summarising the publicly available research, and there is a marked difference between the scientific language and view, and a 'common-man' definition of the length of the 'window period'. Unfortunately, a lot of the detailed research is 'paid-for' content in scientific journals, and not available for eveyone to read unless you can afford thousands of dollars in online subscriptions (health-care for all?). I am not a Physician myself and am not offerring medical advice, but do want to summarise the research available.
Ok, so in general - testing 30 days apart will ensure you detect most (>95%) sero-conversion cases, assuming contact was within the 2 weeks before your 1st test.
An HIV anitbody test is definately helpful for those about to enter a relationship whether short or long term, as its far better to be informed of HIV status at that point in time - even if it is not the definative answer to the partner's status (i.e it requires a followup test).
Taking the HIV anitbody test does not mean giving up safe sex practices, but it is still better to be alerted to those partners that have sero-converted, at that point in time, than to not know at all. Even if it doesnt cover 100% of the risk (if you or your partner are still in the 'window period' before sero-conversion), studies show that a large majority of tests will still be provide a valid result.
Some reports show seroconversion average time is 14 days, but it can happen up to 12 weeks, thats why the window period is typically described as 12 weeks.
The AVERAGE period of time that an infected person will show positive on the test is 25 days. This is an average, so not all people will test positive by this point in time. At 3 months, most persons (>90%) infected with HIV will already show positive on the test.
Other reports show:
50% of the people have detectable antibodies at 2 weeks
95% at 6 weeks
98-99% at 8 weeks
100% at 12 weeks
But there have also been medical 'exceptions' so rare they are reported in Journals, such as one patient that seroconverted past 6 months.
For more details about the timing of sero-conversion, you can go to this website http://www.thebody.com/Forums/AIDS/SafeSex/Archive/Testing/Q9546.html and other scientific websites, or consult a specialist clinic.
Keep in mind Physicians will provide the most conservative ranges or estimates,as thats their duty of care, and you too should also be conservative.
Many people still want to know their status, and the stress psychologically can be debilitating. So it is far better to test and eliminate any worry. Test your HIV status 2 months apart to be reassured.
The typical method is to go to a Doctor or Clinic and get a PCR or Western Blot test, however a portable HIV antibody test is still a highly reliable and useful screening tool for those who are travelling or want to check at home before going to a clinic and registering. 美国cdc明明说是3个月97%的 抗体加上抗原检测，还真可能达到这个数。 我们具体到个体的话就要用实践来证明 百分之97是开始检测HIV一直到现在的！！包括了1代2代3代4代试剂的检测直到现在的统计数据还要加上服用阻断药的数据 另外百分之3 有很多是不确定因素，欧洲都明确表示了 6个月的就发现几个 是个位数！！！你自己去好好找资料看看！！ 2# wangxiaohua0001 十二周百分百~太棒了~说明国家的三个月还是很准确的~
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