This article is dedicated to discussing the mcv blood test - giving you a description of it, and providing any other information that might be of use (any meaning the information I THINK could be of use; as I'm no doctor and could make a good evaluation; so take everything mentioned with a grain of salt; I'm taking it from a good source, but people mistakes; and so might the individual behind the original have done).
So, what's this MCV-test? It calculates sizes of red-blood-cells. There are "normal values", which, if you are "inside them", you are safe - but, in the case that you are not inside, you might suffer from ailments or a blood-disorder.
When is the MCV particularly valuable? At times when nothing else shows a problem, this test's able to give signals that are not given by something else.

So, what can these anormalities in RBC-size cause? If too big, anemias might happen - because your body hasn't been given a sufficient amount of B12-vitamin. If too small, anemias may come to be, as well, and thalassemias' more likely to happen.
If the RBC-size is normal but bordering on becoming anormal - do you have something to worry about? Likely, you have nothing to panic about - actually, panicing is never a good idea. Since they ARE normal, only a little more than optimal, a slight change in something that highly affect RBC-size should turn things in a direction toward optimal values. How can this be done? As usual, when it comes to health, alcohol's an issue. If you have been drinking a lot, should you panic, and start blaiming yourself? No, but you should probably really look at what has happened - if you, in talking to someone who really is knowledgeable about RBC-sizes, come to the conclusion that alcohol's had the effect of increasing RBC-sizes - and, if you, and whom you are consulting, find further equal alcohol-comsumption would be harmful to your health, you should decide that you need to cut down on it. Once again, though, don't panic about it - just look at the cards on the table, and make a decision based on them.

Hopefully, this little article about the mcv blood test has given you something of value to your life. Thank you for reading.