Both values must be within 2.7 seconds of the 27 second value Expected Values Each lab establishes its own reference range which varies according to a number of factors including patient population characteristics (e.g., age, gender, anticoagulant history, etc.), and the type of PTT reagent an...
PTT-LA
The normal range of the APTT is 30 to 40 seconds. If the value exceeds 70 seconds, it indicates bleeding disorders. The reference value of APTT varies among laboratories due to the chemicals they use to perform the test. However, it should generally range between 25 to 38 seconds. If the...