in 8 of the 26 patients who experienced recurrence of non-clotting blood after initial response to antivenom , serial measurements of plasma venom and antivenom concentrations revealed that recurrence of venom antigenemia and non-clotting blood bore no direct relation to the elimination half-life of the antivenom used , but non-clotting blood recurred when serum antivenom levels fell below 10-20 % of the total given .
C0032105
plasma
C0229671
serum