Clotting NRS 325 LABS NEED TO KNOW

Prothrombin Time (PT) / International Normalized Ratio (INR) Normal INR

around 1

Prothrombin Time (PT) / International Normalized Ratio (INR) therapeutic INR

Varies, usually 2-3

What does prothrombin Time (PT) / International Normalized Ratio (INR) measure?

Warfarin, how long your blood takes to clot

high INR means

increased bleeding risk

low INR means

increased clotting risk

What does Partial Thromboplastin Time (PTT or aPTT) measure

heparin, measures the time it takes for a clot to form in a blood sample

Partial Thromboplastin Time (PTT or aPTT) normal

21-35 seconds

Partial Thromboplastin Time (PTT or aPTT) therapeutic

Varies, usually 60-80 seconds

D-dimer what does it measure

used to check if you may have a blood clot. The test helps to find out if you need more tests to check for blood clotting disorders like (Pulmonary embolism, myocardial infarction, and ischemic stroke)

high d-dimer means

can be a sign of a blood clotting disorder

low d-dimer test means

patient doesn’t have a clotting disorder

Sub-therapeutic

far below the normal therapeutic range

Supra therapeutic

exceeds the normal therapeutic range