PARTIAL THROMBOPLASTIN TIME (PTT) DADE FS

Additional Codes

Software	Test Code
Label Text	FSPTT
EPIC	LAB11413

Performing Laboratory

NorDx Laboratories

Useful For

Detection of factor deficiencies (VIII, IX, XI and XII) of the intrinsic clotting system

The test has moderate sensitivity to lupus anticoagulants and high sensitivity to heparin.

Used in conjunction with other coagulation tests, the inclusion or elimination of factor deficiencies can be made.

Method Name

Clot-Based Assay

Reference Values

23 - 29 sec

Days and Times Test Performed

Monday

Report Available

Up to 1 Week

Available Stat

Specimen Type

Plasma

Preferred Container

Light Blue Top Tube (Sodium Citrate) – Tube must be full at time of collection.

Specimen Collection and Handling

Collect specimen as follows:

1. Draw blood in light blue-top (3.2% sodium citrate) tube(s). Tube(s) must be full upon collection.

2. Separate plasma from cells as soon as possible within 4 hours of collection in a centrifuge at 2,500 rpm for 15 minutes or 3,000 rpm for 10 minutes.

3. Using a plastic transfer pipette (do not use a glass pipette) decant the plasma to a screw-capped, plastic (polypropylene) vial. Glass vials will not be accepted.

4. Spin the plasma again at 2,500 rpm for 15 minutes or 3,000 rpm for 10 minutes. Note: Double spinning the specimen ensures platelet poor plasma (<10,000 uL)

5. Divide the plasma into as many 0.5-1.0 mL aliquots as possible and cap the vial(s) tightly.

6. Place tubes upright and flash freeze specimen(s) immediately at ≤ – 20° C or below.

7. Send specimen(s) FROZEN on dry ice.

Click here to view the Procedure for Collecting a Specimen from an A-line

Specimen Stability Information

Specimen Type: Plasma

Room Temp: 4 Hours

Note: Whole blood that remains capped and unspun is stable for up to 4 hours when stored at room temperature (18 – 24°C). Frozen plasma is stable 2 weeks @ -20°C and 12 months @ -70°C. Blue top tubes for coag assays must not be refrigerated or placed on ice.

Add On Capable

Yes

Advance Beneficiary Notice Requirements

This test, when ordered on Medicare patients, is subject to the National Coverage Determination (NCD) policies. Please verify that the diagnosis code (ICD code) you have chosen demonstrates medical necessity for the test as documented in the physician’s patient record. The CMS web site is available to assist you with this verification. A properly executed Advance Beneficiary Notice (ABN) must be submitted with the specimen if medical necessity is not demonstrated by the ICD code chosen.

CPT Code Information

CPT Code	CPT Description	CPT Disclaimer
85730	Thromboplastin Time, Partial (PTT), Plasma or Whole Blood

Keywords

ACTIN

Performing Laboratory Location