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General Information:

Web Links:

Mayo Clinic Laboratories

Test Code LAB0248807 Partial Thromboplastin Time (APTT, PTT), Plasma

Methodology

Photometric Clot Detection

Performing Laboratory

CentraCare Laboratory Services

Specimen Requirements

Specimen Type: Plasma

Container/Tube: Light-blue top (3.2% sodium citrate)

Specimen Volume: 5 mL

Collection Instructions:

1. Draw a full tube. This tube must be second tube drawn.

2. Centrifuge for 10 minutes at 3,000 rpm.

3. If there is a delay in testing of >4 hours, freeze plasma immediately at -20° C and send frozen in plastic vial.

Specimen Transport Temperature

Refrigerated 4 hours/Frozen OK

Reference Values

25.1-36.5 seconds
Critical value (automatic call-back): >65 seconds

Note: This critical value changes each year with new lot numbers of reagents.

Day(s) Test Set Up

Monday through Sunday

Test Classification and CPT Coding

85730