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Test Code PTT PTT (ACTIVATED PARTIAL THROMBOPLASTIN TIME)

Aliasis

APTT, PTT, Partial Thromboplastin

Patient Preparation

No special patient preparation required

Special Collection Instructions

Properly filled 9:1 ratio (blood to anticoagulant)

Collection Method

Venous collection; properly filled 9:1 ratio (blood to anticoagulant)

Minimum Volume

0.5 mL of plasma from a properly filled 1.8 mL or 2.7 mL NaCitrate (light blue) tube

Container

Light Blue Sodium Citrate

Preferred Specimen

2.7 mL Lt Blue (3.2% NaCitrate)

Acceptable Specimen(s)

1.8 mL Lt Blue (3.2% NaCitrate tube)

Reference or Target Ranges

21.0 – 32.8 seconds

 

51 – 80 seconds

Suggested therapeutic range

Reportable Units

Seconds

Critical Value

> 100 seconds

Reasons for Rejection

Other:                

Short draws, Over draws, Clotted, Improperly labeled

Specimen Stability

Plasma

 

Ambient:

4 Hours; Specimen must be centrifuged within 1 hour of collection

Frozen:

2 Weeks

Performance Information

Days and Time Performed

24/7

Expected Turn Around Time

Stat: 1 Hour, Routine: 4 Hours

Stat Availability

Yes

Performing Bench

CRMC Coag

Methodology/Method Description

CS - 2500

Methodology/Method Description

The CS-2500 employs the photo-optical detection method.

CPT Codes

85730