Anaemia is a common condition where there's not enough healthy red blood cells to carry oxygen to the body's tissues.

It can cause debilitating symptoms, including tiredness, weakness and shortness of breath. 

For the first time in 50 years the World Health Organization has revised its guidelines for diagnosis. 

Professor Sant-Rayn Pasricha from the Walter and Eliza Hall Institute says a global consensus to define anaemia will improve treatment.