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When you are taking warfarin or once you have unexplained or prolonged bleeding or unreasonable blood clotting


None needed, although if you room receiving anticoagulant therapy, the blood sample should be accumulated before taking your daily dose.


A PT measures the number of seconds it takes for a clot to type in your sample the blood ~ substances (reagents) are added. The PT is often performed together with a partial thromboplastin time (PTT) and together they assess the lot and function of proteins called coagulation components that are an essential part of suitable blood gerean formation.

In the body, when there is one injury and also bleeding occurs, the clotting procedure called hemostasis begins. This process involves in part a collection of sequential chemistry reactions referred to as the coagulation cascade, in i beg your pardon coagulation or “clotting” determinants are set off one after an additional and result in the development of a clot. There should be a adequate quantity of every coagulation factor, and also each must function properly, in bespeak for regular clotting come occur. Too little can command to too much bleeding; as well much may lead to extreme clotting.

In a test tube during a activities test, there space two “pathways” that have the right to initiate clotting, the so-called extrinsic and also intrinsic pathways. Both the these then merge into a usual pathway to complete the clotting process.

The PT test evaluates how well every one of the coagulation components in the extrinsic and also common pathways of the coagulation cascade occupational together. Consisted of are: determinants I (Fibrinogen), II (Prothrombin), V, VII and X.The PT/INR may be excellent at the same time together a PTT, which evaluate the clotting determinants that are component of the intrinsic and common pathways: XII, XI, IX, VIII, X, V, II (prothrombin), and also I (fibrinogen) and also prekallikrein (PK) and high molecular weight kininogen (HK).

The PT and PTT evaluate the overall ability to create a gerean in a reasonable lot of time and, if any type of of these components are deficient in amount or no functioning properly, the test results will it is in prolonged.

The INR is a calculation that adjusts for alters in the PT reagents and allows for results from various laboratories to be compared. Many laboratories report both PT and also INR worths whenever a PT test is performed. The INR have to be just applicable, however, because that those taking the blood-thinning medication warfarin.


The PT and INR are provided to screen the efficiency of the anticoagulant warfarin. Warfarin is prescribed for world with a variety of conditions to “thin” your blood and also prevent inappropriate clotting. A health care practitioner will typically prescribe warfarin and also measure just how well that dose “thins” the blood using the PT/INR. The dose may be changed up or down depending on the result and come ensure the dose is adequate in staying clear of clots without causing excessive bleeding. This balance requires careful monitoring.

Warfarin may be prescribed for problems such as:

Irregular heartbeat (atrial fibrillation)The existence of man-made heart valves

The PT test may be used together with a PTT together the starting points for investigating too much bleeding or coagulation disorders. By evaluating the outcomes of the PT and PTT together, a wellness practitioner can get clues as to what bleeding or coagulation disorder may be present. These tests are not diagnostic through themselves however usually provide information on whether or what further testing may it is in needed.

Examples the other trial and error that might be done in addition to a PT and PTT or in follow as much as abnormal outcomes include:

Based on closely obtained patience histories, the PTT and also PT test are sometimes selectively performed together pre-surgical or before other invasive steps to display screen for potential bleeding tendencies.


A PT and also INR space ordered ~ above a continuous basis when a human being is acquisition the anticoagulant drug warfarin come make certain that the medicine is creating the wanted effect.

The PT may be ordered as soon as a human being who is no taking anticoagulant drugs has actually signs or symptom of too much bleeding or clotting, together as:

Unexplained bleeding or basic bruisingNosebleedsBleeding gumsA blood gerean in a vein or artery

PT, together with PTT, may be ordered prior to surgery when the surgical procedure carries an boosted risk the blood lose and/or as soon as the person has a clinical history of bleeding, such as frequent or too much nosebleeds and easy bruising, i beg your pardon may suggest the presence of a bleeding disorder.


For civilization taking warfarin, most laboratories report PT outcomes that have actually been adjusted to the INR. These civilization should have an INR the 2.0 to 3.0 for straightforward “blood-thinning” needs. For part who have a high danger of a blood clot, the INR demands to be greater – about 2.5 to 3.5.

For individuals who are not taking warfarin, the reference selection for a PT depends on the technique used, with results measured in seconds and also compared to the normal variety established and maintained by the laboratory that performs the test. This normal range represents an median value the healthy civilization who live in that area and will vary somewhat from lab to lab. Someone who is no taking warfarin would certainly compare their PT test an outcome to the common range provided with the test result by the activities performing the test.

A lengthy PT method that the blood is acquisition too lengthy to form a clot. This may be led to by conditions such as liver disease, vitamin K deficiency, or a coagulation variable deficiency (e.g., aspect VII deficiency). The PT an outcome is often taken with the of the PTT in determining what problem may it is in present.

Interpretation of PT and PTT in Patients with a Bleeding or clotting Syndrome

PT resultptt resultExample of conditions that might be present
ProlongedNormalLiver disease, vitamin K insufficiency, diminished or defective element VII, chronic low-grade disseminated intravascular coagulation (DIC), anticoagulation medicine (warfarin) therapy
NormalProlongedDecreased or defective aspect VIII, IX, XI, or XII, von Willebrand an illness (severe type), presence of lupus anticoagulant, autoantibody versus a specific factor (e.g., element VIII)
ProlongedProlongedDecreased or defective variable I, II, V or X, significant liver disease, acute DIC, warfarin overdose
NormalNormal or slightly prolongedMay suggest normal hemostasis; however, PT and PTT can be typical in problems such as mild deficiencies in coagulation factor(s), mild type of von Willebrand disease, and also presence of weak lupus anticoagulant. Further trial and error may be forced to diagnose these conditions.

Some antibiotics have the right to increase the PT and also INR. Barbiturates, oral contraceptives and hormone-replacement treatment (HRT), and also vitamin K (either in a multivitamin or liquid nutrition supplement) might decrease PT.

Drinking alcohol deserve to also impact PT results. Specific foods, such as beef and also pork liver, environment-friendly tea, broccoli, chickpeas, kale, turnip greens, and soybean products, contain large amounts of vitamin K and can change PT results. The is vital that a healthcare provider knows about all the the drugs, supplements, and also foods that you have consumed recently so the the PT and also INR outcomes are interpreted and used correctly.


Warfarin functions by to reduce the accessible vitamin K because that the liver to make several of the blood coagulation factors. Thus, warfarin and vitamin K space antagonists—they work against each other. Significant increases or reduce in the amount of vitamin K a person consumes can influence how well that person’s dose the warfarin functions in preventing blood clots without causing excess bleeding. So quite than avoiding foods rich in vitamin K, that is an ext important for you come consume a regular amount the those foodstuffs each day. Girlfriend can gain the vitamin K you need as long as you are consistent about the amount friend consume.


Illness, readjust in diet, and some medications (as mentioned above) can change PT/INR results. Particular foods, such as beef and pork liver, green tea, broccoli, chickpeas, kale, turnip greens, and also soybean products contain huge amounts of vitamin K and also can alter PT/INR results. The blood collection technique and the an obstacle in obtaining the blood sample can also influence test results. If your health care provider has actually concerns about the stability of her PT/INR, your provider may test her blood more frequently prior to adjusting her dose.


You may be able to find your test results on your laboratory’s website or patient portal. However, friend are right now at lab Tests Online. You may have actually been directed below by your lab’s website in bespeak to carry out you through background information around the test(s) you had performed. You will need to return to her lab’s website or portal, or call your medical care practitioner in order to obtain your check results.

Lab Tests digital is one award-winning patient education and learning website offering info on activities tests. The content on the site, which has been the evaluation by activities scientists and also other medical professionals, provides basic explanations the what results can mean because that each test detailed on the site, such together what a high or short value can suggest to your healthcare practitioner about your health and wellness or medical condition.


The reference ranges for her tests deserve to be uncovered on your laboratory report. Lock are generally found come the appropriate of her results.

If you execute not have actually your rap report, consult your medical care provider or the activities that carry out the test(s) to obtain the referral range.

Laboratory test outcomes are not systematic by themselves. Their an interpretation comes from comparison to recommendation ranges. Reference arrays are the values expected for a healthy person. They are sometimes called “normal” values. By comparing your test outcomes with recommendation values, you and your medical care provider deserve to see if any of her test results fall exterior the variety of expected values. Values that are external expected ranges can provide clues to help identify possible conditions or diseases.

While accuracy the laboratory trial and error has substantially evolved over the past couple of decades, some lab-to-lab variability can happen due to differences in experimentation equipment, chemistry reagents, and techniques. This is a factor why so few reference arrays are listed on this site. The is crucial to understand that you need to use the selection supplied by the activities that performed her test come evaluate even if it is your results are “within common limits.”

For more information, please review the post Reference Ranges and What castle Mean.


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Listed in the table below are the LOINC with links to the LOINC information pages.

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Please keep in mind when you click on the hyperlinked code, you space leaving rap Tests Online and accessing Loinc.org.

LOINCLOINC display screen Name
52129-4INR post heparin adsorption Coag (PPP)
34714-6INR Coag (Bld)
46418-0INR Coag (BldC)
38875-1INR Coag (Platelet bad plasma or blood)
6301-6INR Coag (PPP)
5964-2PT Coag (Bld)
46417-2PT Coag (BldC)
5901-4PT Coag (PPP control)
42638-7PT Coagulation 1:1 saline (PPP)
5902-2PT Coag (PPP)