Milad Abdalla: When 180,000 Becomes 45,000 – The EDTA Trap
Milad Abdalla, Medical Laboratory Technologist at Al Yalayis Government Transactions Center, shared a post on LinkedIn:
“When 180,000 Becomes 45,000: The EDTA Trap
The analyzer flagged severe thrombocytopenia. The patient looked completely healthy.
The peripheral smear revealed the truth.
‘EDTA-dependent pseudothrombocytopenia.’
EDTA causes platelets to clump ‘in the tube’ — not in the patient.
The automated counter mistakes these clumps for one large cell and reports a falsely low count.
Simple ways to resolve it:
- Recollect in a ‘Sodium Citrate‘ tube and multiply the result by 1.1
- Process the sample within 1 hour before significant clumping occurs
- Warm the sample at 37°C for 10 minutes to disperse early clumps
We encountered this exact case last month during a pre-op screening. A ‘critical’ platelet count of 45,000 turned into a normal 180,000 on citrate. The patient proceeded to surgery instead of a hematology referral.
‘Key takeaway:’
Never trust a platelet count that doesn’t match the clinical picture or the blood smear.
Have you seen EDTA-dependent pseudothrombocytopenia in your lab or practice?
What tipped you off — the instrument flag, the smear, or clinical suspicion?”
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