Prothrombin Time/INR (PT/INR)

Synonyms

• LAB320
• PROTIME-INR
• PT

Cerner Name

Protime/INR

Clinical Info

Specimen Sources

Blood, Arterial Blood, Capillary Blood, Central Line Blood, Venous

Specimen Types

Blood

Specimen Volume

Full tube

Container

Blue Top Tube

Collection Instructions

One (1) part 3.2% sodium citrate to nine (9)
parts whole blood (Blue top Vacutainer®). The ratio of blood to
anticoagulant is critical.  Erroneous
clotting times may result if this ratio is not achieved.  The collection tube must have a
"nonwettable or siliconized" surface to eliminate contact
activation.  NCCLS guidelines require a
minimum of 90% expected fill of the collection tube to guarantee accuracy of
results. If the light blue top tube is the only tube to be drawn and will be
collected using a butterfly set, a “discard” tube (either
a plain[non-additive] or light blue) must be partially drawn just to
completely fill the collection tubing with blood before collecting the
light blue top for testing.

Transport Instructions

Room Temperature

Specimen Stability

24 Hours Room Temperature (18-24C)

Methodology

IL ACL-Top 

Days Performed

Monday through Sunday, Continuously

Performing Laboratory

Northwell Health Laboratories

CPT

85610

PDM

5500515

Only Orderable at Locations:

Orderable Everywhere

Results

Result Interpretation

Forms