A low blood count can cause fatigue and weakness in an individual. Besides, the person stands at a higher risk of contracting infections. In such cases, a body with a low blood count may not be able to protect itself, which can lead to health complications. A complete blood count test helps in measuring the total number of white blood cells in the blood and any disorders related to it like autoimmune and inflammatory diseases, bacterial or viral infection, etc. Besides, a lower blood count may also lead to anaemia where the patient’s body may struggle to supply oxygen to the tissues, making them feel fatigued and short of breath. To diagnose anaemia, the doctor may perform a physical examination and prescribe a complete blood count test to determine the levels of red blood cells and haemoglobin in the blood.