Clinical utility of automated platelet clump count in the screening for ethylene diamine tetraacetic acid-dependent pseudothrombocytopenia.
- Author:
Wei WU
1
;
Ye GUO
;
Lin ZHANG
;
Wei CUI
;
Wei LI
;
Shuo ZHANG
Author Information
- Publication Type:Journal Article
- MeSH: Adult; Edetic Acid; adverse effects; Female; Humans; Male; Middle Aged; Platelet Aggregation; drug effects; Platelet Count; methods; Thrombocytopenia; diagnosis; Young Adult
- From: Chinese Medical Journal 2011;124(20):3353-3357
- CountryChina
- Language:English
-
Abstract:
BACKGROUNDPlatelet (PLT) clumping occurring in pseudothrombocytopenia (PTCP) can result in inaccurate PLT. Automated platelet clump count (APCC) is a quantitative parameter of platelet aggregation. In this study, we evaluated the clinical utility of APCC in the screening for platelet aggregation related ethylene diamine tetraacetic acid (EDTA)-dependent PTCP (EDTA-PTCP).
METHODSA total of 105 patients and 200 healthy individuals were enrolled in this study. Blood samples were collected with dipotassium EDTA and sodium citrate respectively. ADVIA 2120 hematology analyzer was used to perform complete blood count (CBC) and APCC. Blood smears of both EDTA- and citrate-anticoagulated samples were made for microscope observation and manual PLT counting.
RESULTSIn 25 patients with EDTA-PTCP patients, for EDTA-2K anticoagulated-blood, PLT was (55 ± 6) × 10(9)/L, significantly lower than citrate anticoagulated blood ((186 ± 13) × 10(9)/L)). APCC was (905 ± 694) × 10(9)/L, significantly higher than citrate anticoagulated blood (98 ± 37) × 10(9)/L. In true thrombocytopenia and healthy control groups, APCC was (63 ± 60) × 10(9)/L and (69 ± 59) × 10(9)/L respectively and there was no significant difference between EDTA and citrate anticoagulants. Receiver operator characteristic (ROC) curve showed both sensitivity and specificity of APCC were 96% when the cutoff value of APCC was set as 182 × 10(9)/L. Other platelet parameters had poor performance.
CONCLUSIONThe APCC has a good sensitivity and specificity in differentiating EDTA-PTCP from true thrombocytopenia compared with other platelet parameters.