Platelet Function Closure Time ADP (Reflex test if PFCT is Abnormal)
| Sunquest Code: | PFCTA | ||
| Epic Code: | LAB3673 | Epic Name: | Platelet Function Closure Time ADP |
| Synonyms: | Replaces Bleeding Time; Recommended for Aspirin Resistance | ||
| Methodology: | Activated clotting | ||
| Turnaround Time: | Performed and reported 24 hours per day. | ||
Collection Instructions
| Specimen: | Blood |
| Optimal Volume: | 5.4 mL (in two 3 mL tubes for correct anticoagulant to blood ratio) |
| Minimum\Peds Volume: | 2.7 mL (in a 3 mL tube) Note: This volume does not permit further testing if results are abnormal. |
| Container: | Blue Na Citrate, 3.2% - fill to fill line on tube |
| Collection Instructions: | Samples should be collected using a 21 gauge needle or larger. Do not use first 2 mL of blood collected. For correct anticoagulant to blood ratio place 2.7 mL blood in 3 mL tube. If patient's hematocrit is greater than 55%, contact laboratory to obtain a special tube. Do not send in Pneumatic Tube System (PTS). |
| After Care: | If the patient has a coagulation abnormality, apply direct pressure to the puncture site for 10 minutes; apply a pressure dressing. Instruct the patient to leave the bandage on for 12 hours. |
| Causes for Rejection: | Over filled or under filled tubes; clotted specimens; plasma specimens; centrifuged specimens; hemolyzed specimens; refrigerated specimens; specimens greater than 4 hours; specimens sent through the PTS. |
Processing and Shipping
| Specimen Processing: | Do not process. Do not store. |
| Shipping Instructions: | Ship at room temperature. Specimens must arrive ASAP (within 3 hours if possible) as testing must be completed within 4 hours of collection. Do not send in PTS. |
| Test Performed at or Referral Lab | Coagulation (Fairview Range - FRMC, UMMC-East Bank, Fairview Southdale - FSH, UMMC/UMMCH-West Bank) |
Interpretive
| Reference Range: |
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| Use: | Closure time is indicated when a disorder of platelet function is suspected by a personal or family history of easy bruising, nosebleeds, menorrhagia or post-operative bleeding. It is not recommended as a screen for potential bleeding risk. Abnormal closure times, indicating possible defective platelet function, should be further investigated with standard platelet aggregation tests. The platelet function closure time (CT) replaced bleeding time which was a poor indicator or surgical bleeding risk, labor intensive, and operator dependent, demonstrated poor correlation to platelet function and caused scarring. The CT is sensitive to platelet adhesion and aggregation abnormalities, thereby providing increased sensitivity for von Willebrand screening and aspirin-induced platelet dysfunction in comparison to the bleeding time. |
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