Cut off values for HCV titer categories

Question

سلام،

Information about health care workers included age and ***. Information about exposure included the type of exposure (i.e., percutaneous injury or mucous membrane or skin contamination with infectious body fluid) and the body fluid to which the health care worker had been exposed (i.e., blood or other body fluids). For percutaneous injuries, information was collected about the device involved, the use of gloves, and the severity of the injury. Procedures involving a needle placed in the source patient’s artery or vein (e.g., phlebotomy, insertion of an intravenous catheter, or collection of arterial blood gas) were distinguished from other procedures, such as injection into an intravenous catheter. The severity of injury was defined as superficial (surface scratch), moderate (penetration of the skin and bleeding), or deep (deep puncture or wound with bleeding). Information about the source patient included HCV RNA status (i.e., HCV RNA detection and HCV load), as well as hepatitis B virus and HIV status. Cut off values for HCV titer categories were determined using the distribution of HCV load in control subjects (HCV load 33rd and 66th percentiles).

Answer 1

Cut-off value: مرز تشخيصي 

HCV titter categories : دسته بندي بر أساس  تيتر ( عيار) HCV

كات آف عددي است كه نتايج مساوي يا بالاتر از آن، مثبت ( وجود بيماري مورد نظر) تلقي مي شود ( پس كات آف مرز جداكننده افراد بيمار و غير بيمار است!) 

دسته بندي بر أساس تيتر : مثال :

ممكن است در مورد تستي اين دسته بندي مطرح شده باشد:( با فرض كات آف حد اقل 1.0)

كل نتايج كمتر از 0.9 : negative

نتايج بين 0.99-0.9: equivocal. (=مشكوك)

نتيايج مساوي يا بيشتر از1.0: positive 

لذا اگر جواب آزمايش فردي 1.04 بشود، يعني نتيجه تست او مثبت است. 

 

Answer 2

Cut off values رو توي مقاله‌هاي فارسي،معيار برش ترجمه كرده بوند. Titer categories هم ميشه انواع تيتر؟!