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UW Health SMPH
American Family Children's Hospital

UW Hospital and Clinics Lab Test Directory

Test Name: TEG-Patient on Heparin

Test Code(s): TEGH / HCTEGH

CPT Code(s): 85347,85384,85576,85390 (if lysis ordered)

Test Description: Test Component:

Clot time-R, Clot strength-K, Angle, Maximum Amplitude,Coagulation Index-CI and Lysis (if ordered)

Methodology: Thromboelastography

Clinical Significance: Assessment of hemostasis (if patient is receiving heparin)

Days Performed: Daily, 24 hours.

Turnaround Time: Stat: 2 hours.
Routine: 2 hours.

Specimen Requirements

Specimen: Blood

Collection Instructions: DO NOT draw through a line containing heparin.  The venipuncture MUST be atraumatic to avoid hemolysis, contamination with tissue factor or platelet activation.  Tubes must be allowed to fill completely.

If unable to collect 1.8 ml tube (pediatrics only) please call Core Coagulation Lab at 263-9617 or Special Coagulation Lab at 263-5005 for alternate tube and instructions.  

Collection Container: Preferred: Light blue top (3.2% NaCitrate)

Collection Volume: Preferred: 3.5 mL
Pediatrics: Pediatric tube filled to fill mark

Sample Analyzed: Whole Blood

Specimen Processing: Do NOT freeze, refrigerate or centrifuge. Do NOT open tube. Call UWHC Special Coagulation at (608)263-5005 if questions.

Specimen Transport: Deliver specimen to UWHC Core Laboratory (B4/220) within 1 hour of collection. Call UWHC Special Coagulation at (608)263-5005 if questions.

Unacceptable Criteria: Hemolyzed or clotted specimens are NOT acceptable.  A partially filled tube is NOT acceptable.

Stability: Ambient: 2 hours unspun
Refrigerated: Not acceptable
Frozen: Not acceptable


Reference Interval:

Clot time-R,Hep

5.0-11.0 min
Clot Strength-K,Hep 1.0-4.0 min
Angle,Hep 47.0-74.0 degree
Max Amplitude,Hep 50.0-73.0 mm
Lysis,Hep 0.0-8.0%
Coag Index,Hep -3.0-3.0











The use of TEG in pediatric patients has not been cleared by FDA. 


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