Synonyms
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PTT
APTT
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Allscripts (AEHR) Order Name
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Activated Partial Thromboplastin Time
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Sunrise Clinical Manager (SCM) Order Name
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Activated Partial Thromboplastin Time
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Clinical Info
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Specimen Type
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Blood
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Container
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Blue Top Tube
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Collection Instructions
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Container/Tube: Light blue-top (3.2% sodium citrate) tube
Specimen: Full tube
Transport Temperature: Refrigerate
Collection Instructions: 1. If no other tube is drawn, draw a discard tube.
2. Fill tube completely.
3. Mix by gently inverting several times.
Collection Instructions:If the light blue top tube is the only tube to be drawn and will be collected using a
butterfly set, a “discard” tube (either a plain[non-additive] or light blue) must be partially drawn just to completely
fill the collection tubing with blood before collecting the light blue top for testing. Failure to perform this step
will result in an under-filled tube that the laboratory will reject. Allow blood to fill the tube completely to the line on the tube.
The ratio of blood to anticoagulant is critical in coagulation testing and at least a 90% fill is required. Immediately mix
the specimen by gently inverting the tube 4-60 times to completely mix with the anticoagulant.
Failure to perform this can result in a clotted sample, which is unacceptable for testing.
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Transport Instructions
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Refrigerate
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Specimen Stability
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Preferred 4 Hours Acceptable: 24 hrs Refrigerated
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Methodology
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Clotting-ACL® TOP/IL
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Days Performed
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Monday through Sunday, continuously
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Performing Laboratory
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Northwell Health Laboratories
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CPT
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85730
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PDM
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5500540
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Result Interpretation
24.5 - 35.6 Seconds
Recommended therapeutic heparin range (full dose) for APTT is 55-99 seconds.
Recommended therapeutic argatroban range is 1.5 to 3.0 times the baseline APTT value, not to exceed 100 seconds.
Recommended therapeutic refludan range is 1.5 to 2.5 times the baseline APTT.
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Forms
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