Q: What Does BHCG less than 5 (<5) means?

Answer:
BHCG is a short code for Beta-sub-unit Human Chorionic Gonadotropin, the hormone responsible for development of the fetus, and its concentrations are used to investigate how many weeks of pregnancy yet?

If the result is less than 5 it means the test is negative and no pregnancy.
If the BHCG result is any number between 5 and 20, it means borderline and should be retested within 2-3 days to ensure it will increase or drop.
If the BHCG level become 20 and above it considered pregnancy and must retest BHCG test after 48-72 hours to make sure the hormone continue to double every other day which means viable healthy pregnancy.