RDW, MCH, MCV BLOOD TEST

So i just got my labs back from my doctor an I wanted to know why my RDW is out of range..its 17.6 and it’s supposed to be between 11.0-15.0 in that range also my MCH is 24.3 and it’s supposed to be in the range of 27.0-30.0 and my MCV is 75.1 and its supposed to be in the range of 80.0-100.0….can someone explain to me each of them meaning….i watched alot of youtube vids on them but still not understanding…and my doctors appointment is literally like 2 weeks away for my doctor to explain what they are an what they mean and the causes.