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Test Code SQ PTPTT, EPIC LAB4388 INR (Prothrombin Time [PT]) and Activated Partial Thromboplastin Time (APTT), Plasma

Methodology

Mechanical Clot Detection

Performing Laboratory

Meriter Laboratories

Specimen Requirements

Reference ranges are based on 3.2% sodium citrate anticoagulant.

 

Specimen must arrive within 4 hours of draw.

 

Submit only 1 of the following specimens:

 

Specimen Type: Whole blood

Container/Tube: Light-blue top (3.2% sodium citrate)
Specimen Volume: 2.7 mL

Collection Instructions:

1. It is imperative that tube be completely filled.

2. Ratio of blood to anticoagulant is critical for valid results.

3. If patient is receiving heparin, spin down and separate plasma within 1 hour of draw.

 

Specimen Type: Plasma

Collection Container/Tube: Light-blue top (3.2% sodium citrate)

Submission Container/Tube: Plastic vial
Specimen Volume: 1.5 mL

Collection Instructions:

1. It is imperative that tube be completely filled.

2. Ratio of blood to anticoagulant is critical for valid results.

3. If patient is receiving heparin, spin down and separate plasma within 1 hour of draw.

Specimen Transport Temperature

Refrigerated within 4 hours/Ambient OK within 4 hours/Frozen OK for 30 days at -20° C.

NOTE: Any specimens for patients on Heparin therapy should be sent as whole blood unspun or spun platelet-poor plasma within 2 hours of collection. Frozen platelet-poor plasma specimens are stable for up to 30 days.

Reference Values

APTT

20.0-35.0 seconds

Therapeutic APTT: 65.0-89.0 seconds (Meriter Hospital only)

Critical value (automatic call-back): >200.0 seconds

INR: 0.8-1.2

Therapeutic ranges for Coumadin® therapy will remain the same.

INR THERAPEUTIC:

2.0-3.0 (low-to-moderate intensity)

2.5-3.5 (moderate intensity)

Critical value (automatic call-back): 4.5

Critical results will be called to the client if the INR result is 4.0, unless the critical is consistent with previous results.

Day(s) Test Set Up

Monday through Sunday

Test Classification and CPT Coding

85610-PT INR
85730-PTT