The Phantom Platelet Problem: Unmasking Ethylenediaminetetraacetic Acid (EDTA)-Induced Pseudo-Thrombocytopenia

Ethylenediaminetetraacetic acid-induced pseudo-thrombocytopenia (EDTA-PTCP) is an artefact caused by EDTA-dependent platelet clumping in laboratory testing. Unrecognized cases may lead to unnecessary investigations, diagnostic confusion, and inappropriate medical management. We present a case of EDTA-PTCP, a condition that is still commonly overlooked in clinical practice. A clinical suspicion should always be raised when a drop in platelet count in the blood is identified among otherwise asymptomatic patients. To confirm the diagnosis, serial platelet counts on alternative anticoagulants, i.e., citrate or heparin, and blood smear studies to check for platelet clumping have to be performed. EDTA-PTCP awareness is vital to prevent patients from unnecessary medical procedures and investigations. Early recognition of this diagnostic artefact and its treatment using the appropriate diagnostic methods will help clinicians avoid misinterpreting laboratory findings. This leads to precise management of affected patients and reduces unnecessary patient anxiety, mismanagement, and healthcare costs.