Table 2.

Test results from the AST and actual pre-bypass ACT

	Heparin resistant	Non-heparin resistant	Total
AST
Positive	54	7	61
Negative	25	214	239
Total	79	221	300

A positive test was an ACT or AST of 480 seconds or less. ACT is activated clotting time. AST is anticoagulation sensitivity test.