12. Loeb M, et al. Development of minimum criteria for the initiation of antibiotics in residents of long term care facilities: results of a consensus conference. Infect Control Hosp Epidemiol. 2001;22(2):120-124.
Normal results vary based on the method and activators used. Normal APTT results are usually between 25-40 seconds; PTT results are between 60-70 seconds.APTT results for a patient on heparin should be 1.5-2.5 times normal values.An APTT longer than 100 seconds indicates spontaneous bleeding.artial thromboplastin time (PTT), a test for detecting coagulation defects of the intrinsic system by adding activated partial thromboplastin to a sample of test plasma and to a control sample of normal plasma. The time required for the formation of a clot in test plasma is compared with that in the normal plasma.
1 The normal range of values for AST (SGOT) is about 5 to 40 units per liter of serum (the liquid part of the blood).2  The normal range of values for ALT (SGPT) is about 7 to 56 units per liter of serum. The normal range of values for AST (SGOT) is about 5 to 40 units per liter of serum (the liquid part of the blood).