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Activated Partial Thromboplastin Time

Last Modified: 9/30/2009 3:23:07 PM


  Medicare Medical Necessity Restrictions May Apply
Medical Necessity Documentation:

For acceptable narrative descriptions and ICD-9 information see Addendum C
Specimen Requirements: A full Whole Blood in a Blue Top Tube - 3.2% Buffered Sodium Citrate
Collection Instructions: Correct ratio of Blood to Citrate is critical (9:1). Specimens must be filled within +/- 10% of stated volume.
Temperature & Stability: 2 hours Ambient or Refrigerated if patient heparinized
24 hours Ambient or Refrigerated if patient non-heparinized
2 weeks frozen within 2 hours of collection if patient heparinized 
2 weeks frozen within 24 hours of collection if patient non-heparinized
 
Reference Range: 24.5 - 34.8 seconds

Therapeutic range for pre-mixed heparin is 50.0-70.0 seconds. Heparin therapeutic range is based on the APTT range corresponding to a heparin concentration of 0.3 to 0.7 U/ml determined by Factor Xa inhibition assay.
Critical Ranges: > 110.0 Seconds
Test Comments: Therapeutic range for pre-mixed heparin is 50.0 - 70.0 seconds
Methodology: Photo Optical

PRODUCTION SCHEDULE

Stat Eligible: Yes
Turn Around Time: 8 hours
Days Performed: Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday
Sites Performed: Parkview Hospital, Parkview Huntington, Parkview LaGrange, Parkview Noble, Parkview North, Parkview Whitley
PHL Test Code: PTT
Alternate Test Names: APTT; Partial Thromboplastin Time; PTT
CPT Coding: 85730

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