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Test Code HEM24 PT, INR, PTT

Synonym

  • PTPTT
  • PT/INR PTT
  • Protime/INR 
  • Activated Partial Thromboplastin Time

Profile Information

Reporting Name Available Separately Always Reported
PT Yes Yes
INR No Yes
PTT Yes Yes

Specimen Required

Preferred Container/Tube: 3.2% Citrate Blue Top - 2.7 mL
Specimen Volume: 2.7 mL
Acceptable Container/Tube: 3.2% Citrate Blue Top - 1.8 mL
Specimen Volume: 1.8 mL
Platelet poor plasma (PPP):
Specimen Volume: 2 - 1 mL aliquots platelet poor plasma (PPP)
Specimen Minimum Volume: 1 - 1 mL aliquot platelet poor plasma (PPP)

Specimen Collection Information

For Outreach, other than OSU Patient Service Centers: Samples must be processed and received frozen/must remain frozen in transit. 

For sending frozen plasma specimens, process immediately upon receipt. Centrifuge capped specimen tube in accordance with CLSI H21, at a speed and time required to consistently produce platelet-poor plasma (PPP = platelet count <10 K/uL). Transfer PPP into plastic aliquot tubes, cap and freeze. DO NOT transport until specimens are completely frozen.

Specimen Stability Information

Ambient (PT):
     Capped whole blood: 24 hours
     Capped and centrifuged: 24 hours
     Uncapped whole blood: 8 hours
     Plasma: 8 hours 
Ambient (PTT):
     Whole blood: 1 hour
     Capped and centrifuged: 4 hours
     Centrifuged and plasma separated from cells: 4 hours
Frozen: 
      Platelet poor plasma: PPP removed from the cells and frozen at -20°C or ideally -70°C.

Rejection Due To

  • Ambient (PT) capped WB specimens >24 hours old
  • Ambient (PT) uncapped WB specimens >24 hours old
  • Ambient (PT) PPP specimens >8 hours old
  • Ambient (PTT) WB specimens >1 hour old
  • Ambient (PTT) PPP specimens >4 hours old
  • Clotted specimens
  • Underfilled or overfilled tube
  • Hemolysis

Reference Values

PT: 11.9-14.2 sec

INR: 0.9-1.1

PTT: 24.0-34.3 sec

Method Description

PT, PTT: Mechanical clot detection

INR: Calculation

Performing Lab

Clinical Lab UH
Clinical Lab University East
Clinical Lab James
Clinical Lab Martha Morehouse
Clinical Lab Spielman
Clinical Lab West Campus

Day(s) Performed

Monday through Sunday

Report Available

Same day/1 day

Reporting Name

PT/INR, PTT

CPT Code Information

85610
85730

LOINC Code Information

5902-2
34714-6
14979-9