I Had A Last Pregnancy 1 Year Back My Child

I had a last pregnancy 1 year back my child had heartblock 3 and other heart issues , she passed away after 5 days of her life . I had my antibodies test like dsdna , ana and ena was negative , my blood count was fine . Rubella was negative too . No health issue during pregnancy . My dr now ordered me for a torch panel test . What does torch mean and why she told me to that when i have no such antibodies