My son is a former iv drug user on suboxone. he is hcv antibody positive, but he did not have a viral load on further testing. should his dad and i get tested?

Probably not : .... Unless you shared razor blades or toothbrushes. Those are high risk situations.

No: No, it is only transmitted through blood or per cutaneous passage through the skin. If you werent sharing needles and such with him then no.

He is: Not contagious. He has no viral load. Transmission is most always from blood to blood anyway and it takes a whole lot of blood with a lower viral load or a smaller amount of blood like on a needle when the viral load is higher. Don't worry. You are safe.