For transparency, this is prompted by a blood test result that said my haemoglobin is higher than normal and I've been advised it's likely dehydration and to retest in six weeks which is what I intend to do, so whilst not seeking medical advice I am curious about what there is to know about this. A few others are slightly off and some of the results within the full blood count be just a little under/over for the last few years. So, what is there to know about high haemoglobin (and I suppose, dehydration that is so marked that it affects blood tests)? It's funny in a way because when fatigue comes on it does feel like my body is heavier and the energy isn't running through it like it should.