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22702 Heparin, Unfractionated

Heparin, Unfractionated
Test Code: HEPUF
Synonyms/Keywords
Heparin-unfract, Unfractionated Heparin​
Useful For
Monitoring unfractionated heparin therapy.
Monitoring low molecular weight heparin (Lovenox, etc), order Heparin, Low Molecular Weight (HEPLMW).
Monitoring fondaparinux (Arixtra), order Fondaparinux (ARIXTRA).​
Specimen Requirements
Specimen Type Preferred Container/Tube Acceptable Container/Tube Specimen Volume Specimen Minimum Volume
(allows for 1 repeat)		 Pediatric Minimum Volume
(no repeat)
*Platelet Poor Plasma 3.2% ​Citrated Blue Top Tube (BTT) ​ 0.75 mL​ 0.75 mL​ 0.5 mL ​
Collection Processing Instructions
One 0.75 mL citrated Blue Top Tube (BTT) plasma aliquot.
If more than one coagulation test is ordered, a separate aliquot is needed for each test.
-Collect in Citrated Blue Top Tube (BTT)
-Citrate anticoagulant must be adjusted for HCT >55%
-Tube must be at least 90% full
-Invert completely 3-4 times (without shaking) to mix
*See Instructions for: Preparation of Platelet Poor Plasma ​
Specimen Stability Information
Specimen Type Temperature Time
​Plasma ​Frozen ​6 months
Rejection Criteria
Clotted or Hemolyzed
​Contamination with IV or Hickman Line fluids
​Specimens that thaw during storage or transport
Performing Laboratory Information
Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
​Marshfield ​Monday through Friday ​Less than 2 hours ​Anti-Factor-Xa Chromogenic/Siemens BCSXP
Reference Range Information
Performing Location Reference Range
​Marshfield

Recommended therapeutic range for DVT = 0.30 - 0.70 anti-Xa IU/mL 

Panic values: <0.10 or >1.50 anti-Xa IU/mL​

Outreach CPTs
CPT Modifier
(if needed)		 Quantity Description Comments
​85520 ​ ​ ​
Synonyms/Keywords
Heparin-unfract, Unfractionated Heparin​
Ordering Applications
Ordering Application Description
​Centricity ​Heparin, Unfractionated
​Cerner None​
​COM ​Heparin, Unfractionated
If the ordering application you are looking for is not listed, contact your local laboratory for assistance.
Specimen Requirements
Specimen Type Preferred Container/Tube Acceptable Container/Tube Specimen Volume Specimen Minimum Volume
(allows for 1 repeat)		 Pediatric Minimum Volume
(no repeat)
*Platelet Poor Plasma 3.2% ​Citrated Blue Top Tube (BTT) ​ 0.75 mL​ 0.75 mL​ 0.5 mL ​
Collection Processing
One 0.75 mL citrated Blue Top Tube (BTT) plasma aliquot.
If more than one coagulation test is ordered, a separate aliquot is needed for each test.
-Collect in Citrated Blue Top Tube (BTT)
-Citrate anticoagulant must be adjusted for HCT >55%
-Tube must be at least 90% full
-Invert completely 3-4 times (without shaking) to mix
*See Instructions for: Preparation of Platelet Poor Plasma ​
Specimen Stability Information
Specimen Type Temperature Time
​Plasma ​Frozen ​6 months
Rejection Criteria
Clotted or Hemolyzed
​Contamination with IV or Hickman Line fluids
​Specimens that thaw during storage or transport
Useful For
Monitoring unfractionated heparin therapy.
Monitoring low molecular weight heparin (Lovenox, etc), order Heparin, Low Molecular Weight (HEPLMW).
Monitoring fondaparinux (Arixtra), order Fondaparinux (ARIXTRA).​
Reference Range Information
Performing Location Reference Range
​Marshfield

Recommended therapeutic range for DVT = 0.30 - 0.70 anti-Xa IU/mL 

Panic values: <0.10 or >1.50 anti-Xa IU/mL​

For more information visit:
Performing Laboratory Information
Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
​Marshfield ​Monday through Friday ​Less than 2 hours ​Anti-Factor-Xa Chromogenic/Siemens BCSXP
For billing questions, see Contacts
Outreach CPTs
CPT Modifier
(if needed)		 Quantity Description Comments
​85520 ​ ​ ​
For most current information refer to the Marshfield Laboratory online reference manual.