Yes, testing at 5 months after a potential exposure is well past the window period for all standard
HIV tests, including rapid card and immunoassay tests. The window period for modern 4th generation tests is 45 days, and for rapid antibody tests it is up to 90 days. A negative result at 5 months is considered conclusive and reliable.
Next Steps
Please consult me directly on Practo for a detailed evaluation if you have concerns about the result or need further guidance.