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.
The normal values for AST in males are 14-20 units per liter or U/L, which may be translated to 0.23 to 0.33 microkats per liter or mckat/L.In females, the normal ranges are defined as 10- 36 U/L, which may be translated as 0.17 to 0.60 mckat/L.he normal values for AST in males are 14-20 units per liter or U/L, which may be translated to 0.23 to 0.33 microkats per liter or mckat/L.