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Feb 3, 2017

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100

UWHC,UWMF,

Clinical Hub,Tools & Resources,UWHC Lab Test Directory,Coagulation

Platelet Aggregation, Ristocetin Only (includes Hematocrit and Platelet Count)

Platelet Aggregation, Ristocetin Only (includes Hematocrit and Platelet Count) (HCRISTAGG) Coagulation Lab Test

Name: Platelet Aggregation, Ristocetin Only (includes Hematocrit and Platelet Count)

Test Name: Platelet Aggregation, Ristocetin Only (includes Hematocrit and Platelet Count)

Health Link Test Code: HCRISTAGG

LIS Test Code: RISTAGG

CPT Code(s): 85576, 85049, 85014

Test Component:

Platelet Aggregation Ristocetin only, Hematocrit, Platelet Count

Methodology: Impedance

Clinical Information:

Test measures the ability of platelets to aggregate in whole blood in response to ristocetin.

Days Performed: Mon-Fri, 0700-1600. Specimens will not be accepted prior to 0700 or after 1600. Testing required during off hours must be approved by a Coagulation physician. Call 263-5005 before collection.

In-Lab Turnaround Time: 2 hours.

Stat In-Lab Turnaround Time: 1 hour.

Patient Preparation:

The results may be affected if the patient has ingested aspirin or any anti-platelet medication, antihistamines, non-narcotic analgesics or NSAIDS prior to testing.

Specimen: Blood

Collection Container: Light blue top (3.2% Na Citrate) and K3EDTA-Lavender top

Collection Instructions:

Do NOT draw through a line containing heparin. The venipuncture MUST be atraumatic to avoid hemolysis and contamination with tissue factors and platelet activators. Tube must be allowed to fill completely.

 

Please indicate patient history and if patient is receiving anticoagulant (Warfarin/Heparin/Vitamin K antagonists), direct thrombin inhibitor or fibrinolytic agent therapy and duration.

Collection Volume: 1 full 3.5 mL lt. blue and 1-4mL lavender top

Pediatric Collection Volume: 2 full pediatric lt. blue tops filled to fill mark and 1-2mL lavender top

Stability Ambient:

3 hours unspun

Stability Refridgerated:

Not acceptable

Stability Frozen:

Not acceptable

Sample Analyzed: Whole Blood

Specimen Processing:

Do NOT send through pneumatic tube. Do NOT freeze, refrigerate, or centrifuge. Do NOT open tube.

Outreach Specimen Processing:

Do NOT send through pneumatic tube. Do NOT freeze, refrigerate, or centrifuge. Do NOT open tube.

 

Transport at room temperature. Specimens must be received within 2 hours of collection.

Specimen Transport:

Hand deliver specimen to UWHC Hospital Laboratory ASAP. Do NOT send through a pneumatic tube. Specimens must be received by the laboratory by 1500 Monday through Friday.

Unacceptable Criteria:

Hemolyzed or clotted specimens are not acceptable. A partially filled tube is NOT acceptable. Patient ingestion of aspirin for 7 days and/or antihistamines, non-narcotic analgesics, or NSAIDs for 48 hours prior to sample collection is not acceptable.

Interpretation:

Component

UOM

Reference Range

Age/Gender

Platelet Count

K/µL

160-370

all ages

Hematocrit

%

44-70

0 days – 29 days

28-55

30 days-5 months

32-42

6 months-23 months

33-43

2-9 years

36-47

10-17 years, male

35-45

10-17 years, female

40-52

18 years and up, male

34-46

18 years and up, female

0.15 mg/mL Ristocetin Aggregation

Ohms

<5

all ages

0.40 mg/mL Ristocetin Aggregation

Ohms

>5

all ages

Interpretation Type: Reference Interval

Test Limitations:

Platelet count must be greater than 75 K/mcL for test results to be valid.

Additional Information:

Hand deliver sample ASAP to UWHC Hospital Laboratory. If unable to deliver, please call UWHC Special Coagulation Lab at (608) 263-5005 and someone will come to pick up the sample.