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Annie Bauzon: How to Properly Make a Peripheral Blood Smear

Annie Bauzon/LinkedIn

Apr 7, 2026, 13:50

Annie Bauzon: How to Properly Make a Peripheral Blood Smear

Annie Bauzon, Medical Laboratory Assistant Technician at Med Health Laboratories, shared a post on LinkedIn:

”How to properly make a peripheral blood smear

It may look like a simple lab step, but creating a proper peripheral blood smear is a critical skill that directly impacts patient diagnosis and care.

Every accurate hematology result begins with a well-prepared slide. A poorly made smear can lead to misinterpretation of cell morphology, missed abnormalities, or even incorrect diagnoses. That’s why technique matters just as much as technology in the laboratory.

Key steps in making a good smear:

Place a small drop of blood near one end of a clean slide
Use a spreader slide at a 30–45° angle
Allow the blood to spread along the edge of the spreader
Push the spreader smoothly and quickly to create a thin film

What makes a quality smear?

A smooth transition from thick to thin (gradient)
A well-defined ‘feathered edge’ where cells are evenly distributed
No streaks, ridges, or clumps
Cells that are not distorted or overlapping

This is where red blood cells, white blood cells, and platelets can be clearly evaluated helping detect conditions like anemia, infections, leukemia, and other blood disorders.

Remember: Even the most advanced analyzers rely on manual verification. When results don’t add up, the microscope and a properly made smear—becomes the gold standard.

Behind every slide is a Medical Laboratory Scientist applying skill, precision, and attention to detail because one well-made smear can reveal what machines might miss.”

Annie Bauzon: How to Properly Make a Peripheral Blood Smear