if air touches an infected vaginal fluid will it be inactive for the transmission of hiv
Only if it is an HIV test.
but can they tell you you have hiv by this normal urine test carried out at the hospitals
http://www.sfaf.org/default.aspx?pid=18#sensitivity
http://www.sfaf.org/default.aspx?pid=18#urine
"Because it is less sensitive than a blood test, positive results must be confirmed by a traditional blood sample (ELISA plus WB)".
This doesn't make intuitive sense, since it is less sensitive than traditional blood tests. Intuitively, if the urine test comes up positive, then an ELISA or a rapid test would also be positive.
Urine Test for HIV
A test that detects HIV antibodies in urine was approved by the FDA in 1996. This test is not generally available to consumers. It is usually marketed to insurance companies and to other countries. Note: urine has antibodies for HIV, not HIV itself, so HIV is not transmitted by urine. Manufactured by Seradyn, it is called the "Sentinel" test.
A sample of urine is tested at a certified lab, using a modified ELISA procedure. This test must be ordered by a physician; this means the urine HIV test, by definition, is confidential, not anonymous.
Because it is less sensitive than a blood test, positive results must be confirmed by a traditional blood sample (ELISA plus WB).
HIV antibodies can be detected in urine (there is an HIV urine test).
As for whether the virus itself can be detected in urine, I am at a loss and don't know.