Platelet Aggregation Studies

Test ID LAB5331
EPIC Order PLATELET AGGREGATION
CPT Code(s) 85576, 82397, 80502
Group/Individual Test Group
Laboratory Special Coagulation
Tube Station N/A
Specimen Routine: Drawn with assistance from Special Coagulation Laboratory
Stability Unspun - 3 hrs
Room Temp - 3 hrs
Refrigerated - NO
Frozen - NO
Availability Routine: Monday-Friday, 08:00-12:00; MUST BE SCHEDULED (984-974-8326)
Turnaround Time 7 Business Days
Internal Reference Testing & Outreach Handling Instructions Patient MUST be collected at UNC Medical Center in Chapel Hill, NC
Reference Range Normal:
Agonist Aggregation
(ohms)
 Secretion
(nmoles)
Thrombin NA 0.6 – 2.02
Collagen 2ug 9 - 31 0.67 - 1.97
Collagen 5ug 14 - 30 0.55 - 2.41
Arachidonate 10 - 26 0.26 - 2.28
ADP 5uM 6 - 24 0.02- 0.96
ADP 10uM 9 - 23 0.3 - 1.06
Ristocetin 0.15mg/mL 0 - 4 NA
Ristocetin 0.4 mg/mL 6 - 46 NA

Reviewed by J. Carr on January 15, 2026

UNC Hospitals
McLendon Clinical Laboratories
101 Manning Drive
Chapel Hill, NC 27514