Muhammad Hashim: When the Blood Smear Told a Different Story Behind a ‘Critical’ Platelet Count
Muhammad Hashim, Medical Laboratory Technologist at Shaukat Khanum Memorial Cancer Hospital and Research Centre, shared a post on LinkedIn:
“A Critical Platelet Count… But the Blood Smear Told a Different Story
Today in the hematology laboratory, I received a CBC sample from a 75-year-old male patient admitted to the medical ward. The sample was processed on a 3-part hematology analyzer, and the platelet count appeared critically low at only 4,000/µL.
Surprisingly, the patient did not show the typical bleeding manifestations usually associated with such severe thrombocytopenia. This clinical mismatch raised suspicion about the automated result.
To verify the findings, I prepared a peripheral blood smear from the EDTA sample. On microscopic examination, numerous platelet clumps were clearly visible throughout the smear.
Manual counting revealed that the platelet number was relatively normal, indicating that the analyzer result was falsely low due to platelet clumping.
For further confirmation, the CBC was repeated using a sodium citrate (blue top) tube. This time, the platelet count improved to 84,000/µL, supporting EDTA-induced pseudothrombocytopenia caused by platelet clumping.
This case was a strong reminder that:
- Automated analyzer results should always be correlated clinically
- Peripheral smear examination remains essential in hematology
- Platelet clumping can significantly affect accurate platelet estimation
- Manual smear review still plays a critical role in modern laboratories
- Proper troubleshooting can prevent misleading critical reports and unnecessary clinical concern
Sometimes, the microscope reveals what automation alone cannot.”
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