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PTT

eD-H Order Code

LAB325

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
PTT All 0 Minutes – 15 Days   >100 sec
    15 Days – 1 Months 28 -46 >100 sec
    1 Months – 6 Months 25 -41 >100 sec
    6 Months – 1 Years 25 -41 >100 sec
    1 Years – 6 Years 24 -39 >100 sec
    6 Years – 11 Years 27 -39 >100 sec
    11 Years – 18 Years 25 -38 >100 sec
    18 Years – 150 Years 25 -37 >100 sec

Specimen Stability

4 hours at room temperature

Additional Specimen Instructions

Blue 1.8 mL Sodium Citrate tube filled to the line

OR

Blue 2.7 mL Sodium Citrate tube filled to the line

 

Blue top tubes must be filled within 10% of 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.

 

Specimen drawn more than one hour prior to testing may not be reliable for Heparin monitoring (may be fasely low) if not spun immediately and seperated from the cells.

Interpretive Data

Assay Display Interpretive Data
PTT Recommended therapeutic PTT range for full dose unfractionated heparin is 70-105 seconds

CPT(s)

85730

Performing Lab Section

Hematology