Hi, and thank you for your question
If the same tests are ordered by both providers (eg. HIV testing is ordered by both the STI clinic and by the care providers in a hospital) then both tests should have the same result.
For example, if a person does NOT have an HIV infection, and has an HIV test done in two different locations (one in an STI clinic and another done at a hospital) then both test results will be negative. It is always a good idea to ask a care provider (doctor or nurse) which tests are being ordered. A laboratory can only run tests on blood that a doctor or nurse has asked them to perform.
Let us know if this does not answer your question or if you have any more questions or concerns.