Days Set Up
Daily, 24 hours
Analytic Time

2 hours

MiChart Code
Mixing Study
Soft Order Code
MIXST

Test Updated:

Synonyms

Circulating Anticoagulant
Mixing Study
MIX1
MIXST
APTT, Prolonged
Evaluation of Prolonged PTT
Prolonged PTT Evaluation
MIX STUDY
INHIBITOR SCREEN

Looking to order a test?

We’ve provided helpful links to make ordering easy.

Find a Requisition

All specimens should be accompanied by a requisition.

Submitting Specimens

Learn about how to properly label and where to ship specimens.

Order Kits and Supplies

MLabs provides all the supplies necessary for the collection of specimens.

Test FAQ

Visit our provider FAQ and learn about common questions to ordering tests.

Test Overview

Test Methodology

Dilution of patient's plasma with normal plasma followed by APTT and/or PT determination on the mixtures tested immediately and after 30 minute incubation at 37 C.

Test Usage

To determine reason for prolongation of the PT7 and/or aPTT test. Help to differentiate between a factor deficiency or coagulation inhibitor.

Reference Range

Physician interpretation included.

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Specimen Requirements

Collection Instructions

Collect specimen in two blue top (citrate 3.2%) tubes. Mix by inversion. Specimen should arrive at lab within 3 hours of collection; transport at room temperature. Alternatively, centrifuge, aliquot plasma into two plastic tubes, and freeze the specimen within 4 hours of collection. Transport frozen specimen on dry ice. Collection of the blood through lines that have been previously flushed with heparin should be avoided. If the blood must be drawn through a VAD (vascular access device), the line should be flushed with 5 mL of saline and the first 5 mL of blood or six dead space volumes of the VAD discarded.

Blue Top Tube
Normal Volume
2 full 2.7mL tubes or 2mL of plasma (two 1mL aliquots)
Minimum Volume
2 full 1.8mL tubes or 2mL of plasma (two 1mL aliquots)

Billing Information

CPT Code
85732
Pro Fee Code
 
Insurance Auth Info
 
LOINC
 

Have More Questions?

Explore our helpful billing resources:

Our High Standard

Quality that sets us apart

As the reference laboratory division of Michigan Medicine's Department of Pathology, MLabs shares the institution's commitment to applying established quality principles to clinical laboratory testing. Like other large organizations in complex, consequential fields, we rely on an established approach to monitor quality throughout the testing process.