Platelet Count

The platelet count is the number of platelets per mm in a sample of your blood. Platelets are an important part of the blood's clotting process. This test is used to evaluate patients who develop bleeding disorders.

PREPARATION FOR TEST

No preparation or fasting is needed.

  • Avoid strenuous exercise prior to this test.

  • For females, inform your caregiver if you are pregnant or menstruating.

NORMAL FINDINGS

  • Adult/elderly: 150,000 to 400,000/mm³ or 150 to 400 x 109/L (SI units)

  • Premature infant: 100,000 to 300,000/ mm³

  • Newborn: 150,000 to 300,000/ mm³

  • Infant: 200,000 to 475,000/ mm³

  • Child: 150,000 to 400,000/ mm³

Possible critical values: less than 50,000 or greater than 1 million/ mm³

Ranges for normal findings may vary among different laboratories and hospitals. You should always check with your caregiver after having lab work or other tests done to discuss the meaning of your test results and whether your values are considered within normal limits.

MEANING OF TEST

Your caregiver will go over the test results with you. Your caregiver will discuss the importance and meaning of your results. He or she will also discuss treatment options and additional tests, if needed.

OBTAINING THE TEST RESULTS

It is your responsibility to obtain your test results. Ask the lab or department performing the test when and how you will get your results.