Platelet Estimate (Counter)

Online counter for estimating the patient’s platelet count by counting the average number of platelets in 10 fields multiplied by 15,000. Please click here if you would like to use an input form instead.

Instructions: Find oil immersion fields with non-overlapping cells. Use the “Platelets” button below to count the number of platelets seen. Then, press the “Oil Immersion Fields” button before moving on to another field. Repeat until you finish 10 fields.

Platelets Counted:  Fields Counted:

Progress:

Principle:

Microscopically counting the average number of platelets seen in 10 oil immersion fields on a blood film and multiplying by 15,000 gives an estimate of platelet count done by automated hematology analyzers in thousands per microliter of whole blood.

Notes:

• Platelets must be counted in 10 different fields under 1000x magnification.
• Platelets must be counted in the thin area of the blood smear. Fields must have good distribution of cells with little to no overlapping cells.