Hi fondest. Electrolytes are chemicals in the body which regulate important things in the body, such as potassium and calcium levels.
A low reading can result in weakness, heart palpitations and changes in blood pressure, so it's important to get these tested, especially as your husband's hemoglobin levels are down.
The normal reading for hemoglobin in men is, I believe somewhere between 14 and 17 - in that region, so yes, it's low. This could be to do with diet, any medication he's on, poor kidney function and several other things including hormonal imbalance, so your doctor'll be requesting for all these tests to be carried out so that they get a picture of what's happening. Hope this helps a bit.