Peripheral Blood Smear Examination (Platelet Count and Morphology)

Why This Test Is Done

Your doctor may order this test to evaluate symptoms like unusual bruising, excessive bleeding, or unexplained fatigue that could indicate low platelet counts or abnormal platelet function. It’s also used to monitor conditions like blood cancers, immune disorders, or certain medications that affect platelets.

What to Expect Before the Test

No special preparation is needed. You’ll have a small needle inserted into your arm or hand to draw a few drops of blood. The sample is then spread thinly on a microscope slide for examination. The process takes about 10 minutes.

What Happens During the Test

The blood sample is sent to a lab where it’s spread into a thin film. A trained technician or pathologist examines the smear under a microscope, counting platelets and checking for their size, shape, and any signs of damage or clumping.

Results and Interpretation

Results are qualitative (descriptive) rather than numerical, focusing on platelet count (thousands per microliter) and morphology (appearance). Low platelet counts (thrombocytopenia) or unusually shaped platelets may signal underlying health issues.