What range defines an adequate average platelets per field?

What range defines an adequate average platelets per field?

• A. 0-5
• B. 22-40
• C. 7-21
• D. 50-100

Answer: (C)

Estimating platelets per field is a quick way to gauge platelet concentration on a peripheral smear and to judge whether the smear is suitable for manual counting. For a normal platelet range, the average number of platelets seen in a high-power field should be about 7 to 21 platelets. This range indicates a reliable distribution of platelets across fields; counts much lower can reflect platelet clumping or a poor smear, while counts much higher can suggest an abnormal platelet count or issues with field selection. So, the range 7–21 platelets per high-power field is considered adequate.

Estimating platelets per field is a quick way to gauge platelet concentration on a peripheral smear and to judge whether the smear is suitable for manual counting. For a normal platelet range, the average number of platelets seen in a high-power field should be about 7 to 21 platelets. This range indicates a reliable distribution of platelets across fields; counts much lower can reflect platelet clumping or a poor smear, while counts much higher can suggest an abnormal platelet count or issues with field selection. So, the range 7–21 platelets per high-power field is considered adequate.