PTT, Partial Thromboplastin Time

Specimen Container

1 lt.bl.

Specimen Collection Type

Plasma

Minimum Volume To Collect (Ml)

1.8 mL

Pediatric Volume To Collect (Ml)

1.8 mL

Specimen Preparation

Separate ASAP

Stability

Ambient Stability: 4 hrs
Refrig Stability: Unable
Frozen Stability: 2 Weeks

Unacceptable Conditions

Hemolysis,
Over-filled or under-filled tubes
Capillary draw

Preferred Transportation Temperature

FROZEN

Remarks

IME SENSITIVE

All Light Blue (3.2% Sodium Citrate) tubes must be filled to the proper level as indicated on vacutainer tube no matter what size tube you are using

Do not draw above a running heparin line. If a line has ever had heparin in it, it is not suitable for coagulation tests

CLSI guideline for centrifugation of platelet poor plasma is 1500 x g for 15 minutes. Centrifuges which have been validated to produce platelet poor plasma are also acceptable (at the validated speed and time)

Platelet poor plasma has a platelet count of less than 10,000 platelets per microliter

Performed

Sun-Sat

Reported

Same day

Methodology

Coagulation

Lab Department

Core

Testing Location

RML

Synonyms

Activated Partial Thromboplastin Time
aPTT
Partial Thromboplastin Time
Partial Thromboplastin Time, Activated
PTT

Test OR Panel

Test

Misc Instructions

Separate plasma from cells ASAP
1.0 mL platelet-poor plasma. TIME SENSITIVE

Unit of Measurement

measured in seconds interval

CPT Codes

85730

LOINC

14979-9

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