The normal coagulation time of the human body varies depending on the detection method.

The following are several common detection methods and their corresponding normal reference ranges:

1 Activated partial thromboplastin time (APTT):

The normal reference range is generally 25-37 seconds. APTT mainly reflects the function of coagulation factors VIII, IX, XI, XII, etc. in the intrinsic coagulation pathway.

2 Prothrombin time (PT):

The normal reference value is usually 11-13 seconds. PT is mainly used to evaluate the function of coagulation factors II, V, VII, X, etc. in the extrinsic coagulation pathway.

3 International normalized ratio (INR):

The normal reference range is between 0.8 and 1.2. INR is calculated based on the PT value and is used to monitor the therapeutic effect of oral anticoagulants (such as warfarin) to make the test results between different laboratories comparable.

4 Fibrinogen (FIB):

The normal reference range is 2-4g/L. FIB is a plasma glycoprotein synthesized by the liver and plays a key role in the coagulation process. It is converted into fibrin under the action of thrombin to form a blood clot.

It should be noted that the testing equipment and reagents of different laboratories may differ, and the specific normal reference values ​​may be slightly different. In addition, some physiological factors (such as age, gender, pregnancy, etc.) and pathological factors (such as liver disease, blood system diseases, taking certain drugs, etc.) will also affect the coagulation time. Therefore, when interpreting the coagulation time results, a comprehensive analysis needs to be conducted in combination with the patient's specific situation.