Question category: Haematology
A patient is referred to the haematology clinic due to a slightly elevated platelet count which has been repeated several times during the year. She is very well and states she has no PMH but had an operation as child although she is unsure of what this was for. Her Haemoglobin and white cell count is normal. A blood film does not show giant platelets or platelet clumps but does reveal Howell Jolly bodies. How would you investigate next?