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PT

Important Note

Samples are good for 24 hours spun or unspun. No refrigeration allowed, maintain at room temperature.

 

INR will be reported for all prothrombin time requests.

eD-H Order Code

LAB320

Specimen Collection Information

Specimen Minimum Test Volume Container Special Handling
Blood

PEDI, PICU, or ICN draws refer to specimen collection job aid.

All other Coag tubes must be filled to the line on tube.

  

Specimen Transport Temperature

Double spin, separate, and freeze

Reference Ranges / Critical Values

Assay Gender Age Range Normal Range Critical Values Units
INR All 0 Minutes – 150 Years   >4.9  
PT All 15 Days – 1 Months 9.5 -12.6   sec
    1 Months – 6 Months 9.7 -12.8   sec
    6 Months – 1 Years 9.8 -13.0   sec
    1 Years – 6 Years 9.9 -13.4   sec
    6 Years – 11 Years 10.0 -14.6   sec
    11 Years – 18 Years 10.0 -14.1   sec
    18 Years – 150 Years 9.4 -12.5   sec

Specimen Stability

24 hours

Additional Specimen Instructions

Blue 1.8 mL Sodium Citrate filled to the line

OR

Blue 2.7 mL Sodium Citrate filled to the line

 

 

Blue top tubes must be filled within 10% of the stated volume. A discard tube must be used if a citrate tube is to be drawn using a winged blood collection set. It is important to remove air from the blood collection set to ensure the proper blood volume is obtained in the coag tube.

 

If needed, 1mL sodium citrate tubes can be prepared by the laboratory.  These are a non-vacuum orange screw cap tube with lab prepared anticoagulant. To obtain some of these custom tubes please call the coagulation laboratory at 5-9463.

 

If the patient has a known hematocrit >55%, please contact the coagulation lab for an adjusted collection tube before drawing the blood.

Interpretive Data

Assay Display Interpretive Data
INR An INR <2.0 indicates adequate procoagulant activity for hemostasis in most patients without underlying bleeding disorders though the INR may not adequately reflect hemostatic capacity in patients with liver disease and synthetic impairment. The recommended target INR range for therapeutic anticoagulation is 2.0 – 3.0 for most applications though lower and higher ranges may be appropriate depending on clinical circumstances.
PT MHMH Transfusion Committee Guidelines: INR less than 2.0 PTT less than OR equal to 43.5 seconds or Fibrinogen greater than or equal to 100 mg/dl indicate adequate procoagulant activity for hemostasis in patients without underlying bleeding disorders.

CPT(s)

85610

Performing Lab Section

Hematology