Blood tests that would be undertaken on someone suspected of having a haematological disorder include the following: FBC (full blood count) – haemoglobin concentration, haematocrit, red cell count, red cell indices, white cell count and differentials (neutrophils, lymphocytes, monocytes, eosinophils and basophils); platelet count and size, reticulocyte count, erythrocyte sedimentation rate, plasma/whole blood viscosity and C-reactive protein. Further tests such as bone morrow aspiration and trephine biopsy are undertaken if abnormalities are found in the blood tests that require further investigation to determine the cause.