Equal mix, aPTT

Alphabetical Test listing

Equal mix, aPTT-501

Equal mix, aPTT
Activated partial thromboplastin time mixing study
APTT mixing study
  • APTT
  • If appropriate, normal plasma APTT, equal mix APTT (immediate) and equal mix APTT (incubated 60 minutes)
Sodium citrate (Na cit) plasma

Lt blue Sodium citrate (Na Cit) - 2.7mL

If the patient has a hematocrit >55, a specially prepared Lt blue Sodium citrate (NaCit) tube must be used in place of the standard Lt blue Sodium citrate (NaCit) tube.

Hematocrit-Anticoagulant adjustments

1.5 mL
  • Do not over or under fill tube as the ratio of anticoagulant to whole blood is critical
  • Coag – tube fill guidelines

  • Immediatley following collection, mix sample thoroughly by gentle inverting 8 - 10 times, to prevent clotting
Sodium citrate (Na cit) whole blood - STAT requests only
2.7 mL

Send whole blood sample in original collection container with STAT courier.

Must be tested within 4 hours of collection.


Lt blue Sodium citrate (NaCit) - 2.7mL


Routine testing (plasma):

Frozen (strict)

STAT testing (whole blood):

Ambient - 4 hours

Refrigerated - NO

  • Improper label (unlabeled or mislabeled)
  • Improper anticoagulant
  • Improperly filled tube
  • Hemolysis
  • Clotted specimen
  • Delay in transport
  • Improper storage/transport temperature
  • Grenier tubes are not acceptable
AHL - Coagulation: W
1 - 2 days

Clot Based Assay


See report

85732 (if appropriate)