American astronomer Clyde Tombaugh discovered Pluto in 1930. From 1930 until 2006, Pluto sat comfortably beyond Neptune as the ninth planet in our solar system. In 2006, however, changes were made. The truth is, nothing about Pluto changed, but the definition of a planet did. Once these changes became official, Pluto no longer fit the definition of a planet.
A. Platelets are the tiny blood cells that help stop bleeding by binding together to form a clump or plug at sites of injury inside blood vessels. A normal platelet count is between 150,000 and 450,000 platelets per microliter (one-millionth of a liter, abbreviated mcL).The average platelet count is 237,000 per mcL in men and 266,000 per mcL in women. platelet count below 150,000 per mcL is called thrombocytopenia, while a platelet count over 450,000 is called thrombocytosis. Platelets seem to have a large backup capacity: blood typically still clots normally as long as the platelet count is above 50,000 per mcL (assuming no other problems are present).
1. Get help from a doctor now âº. Range of normals: Platelet volume reference range is the range in size of platelets in a normal population of people. A reference range is also called the range of normal or normal limits, indicating that if you are in that range,  you are presumed also to be normal.latelet count: Normal platelet count --varies with the lab--is usually 150, 000 to 450, 000. Though the 128, 000 and later 118, 000 are lower than the stated normal range, they represent safe levels.