Medically reviewed by Archana Sharma, DO A mean corpuscular volume (MCV) test is a blood test that measures the size and volume of your red blood cells. Red blood cells carry oxygen from the lungs to ...

A blood glucose test measures how much sugar you have in ... but the OGTT takes 2 to 3 hours to complete. A post-prandial test is specifically for use after eating or drinking.

You may have it for years before you notice any symptoms. Most people find out they have PV because they had a blood test for some other reason. If your doctor thinks you have PV, you’ll start ...