ECLIA (electrochemiluminescence immunoassay) is a type of immunoassay.
An immunoassay is a biochemical test that measures the concentration of a substance, using the reaction of an antibody or antibodies to its antigen.
Depending on what is linked to either the antibody or the antigen, there are several types of immunoassay: enzyme immunoassay (EIA), radioimmunoassay (RIA), magnetic labels (MIA), Enzyme-Linked Immunosorbent Assay (ELISA).
All of the above mentioned methods (including ECLIA) are quite reliable. ECLIA is not the same as ELISA, because they have different substances attached in order to detect the substance that is checked for.
Given the data you provided (unprotected oral sex, protected vaginal sex, and negative HIV rapid test with ECLIA method after 6 weeks), it is likely that you are HIV negative. However, because the test checks for antibodies versus HIV, they might not be developed if your immune system is weakened.
In people that received Anti-HIV treatment after exposure, antibodies might need more time to be produced. In these cases, it is recommended to retest at three and six months. If all the tests are negative, a definitive conclusion that you are negative can be given.
You might want to visit a specialist for infective diseases to consult about this issue.
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