Hello, there are a lot of critical details missing from your description but I ll try to give you some direction. A decreased hematocrit with lower than usual mcv and higher rdw usually suggests iron deficiency although this is not 100% certain. Ferritin levels can help estimate the iron stores of your body. Clinical details can be very helpful as well. Any blood loss can cause a drop in hematocrit. This includes menstrual losses, gastrointestinal bleeding, hematuria etc. Decreased iron absorption is another possible cause. It usually has to do with very low meat and fish consumption. If you ve had an infection, a drop in hematocrit may happen due to increased red blood cells destruction (mostly). I hope I ve helped! If you d like a more specific and detailed report, please ask again but mention all the details of your medical history this time! Kind Regards!