Prothrombin Time

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4.2
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Overview
Interpretations
FAQ's

Overview of Prothrombin Time

What is Prothrombin Time?

It measures the amount of time your blood takes to clot. This test is prescribed when you have prolonged bleeding or unexplained clotting such as nosebleeds, gum bleeding or easy bruising. A doctor can also order this test if he is suspecting liver disease, vitamin K deficiency or to monitor the effect of blood thinning drugs like warfarin.

Sample Type

The sample type collected for Prothrombin Time is: Blood

Preparation for Prothrombin Time

  • No special preparation required

Why Get Tested for Prothrombin Time?

  1. If you have signs or symptoms of a bleeding or clotting disorder like easy bruising, heavy menstrual periods, nosebleeds, swollen and painfol joints 
  2. If you are taking blood thinning medicines like warfarin 
  3. If you have suspected liver disease or vitamin K deficiency




What Results of Prothrombin Time mean?

Interpretations

It usually takes 11 to 14 seconds for blood plasma to clot if you are not taking blood thinning medicines. That means the Prothrombin time is usually between 11 to 14 seconds. If you are taking blood thinners like warfarin, the planned INR is between 2 to 3.5. 


Some causes of increased PT are:
a. Bleeding or clotting disorder
b. Wrong dose of warfarin
c. Vitamin K deficiency
d. Liver disease
e. Rarely, Factor II or Prothrombin deficiency


Patient Concerns about Prothrombin Time

Frequently Asked Questions about Prothrombin Time

Q. Are there any other factors which can affect my PT?
Yes, PT is governed by a large number of factors like alcohol, drugs like oral contraceptive pills, food items such as beef, broccoli, green tea etc. Therefore, it is very important for you to tell your doctor about any medicines, supplements or food items which you are taking.
Q. If my PT is abnormal, what other tests will my doctor order?
1. Partial thromboplastin time (PTT) 2. Platelet count 3. Thrombin time 4. Fibrinogen testing 5. Tests for coagulation factors 6. Von Willibrand factor

Provided By

NABL

ISO

Sahyadri Speciality Labs is committed to provide the highest quality of Medical Laboratory services. There is a continual effort to ensure that the staff of the lab understands the Quality Policy & all the quality documentation, as well as follows the Quality manual and implements the Quality System Procedures all the time. By employing QMS, the lab strives to achieve the highest standard of service to provide the most reliable results, nearest to the true value and at most competitive rates. The lab is committed to good & ethical professional practices giving highest priority to client’s confidentiality and ensuring the reporting of the test values without any bias or influence. The lab implements the QMS so as to conform to ISO 15189:2007 and NABL 112 with the objective of Reducing reporting errors to the minimum, Minimizing customer complaints, Achieving maximum growth of the lab.
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