Blood tests are needed in various situations, ranging from routine health checkups to diagnosing specific medical conditions. During an annual physical examination, your doctor might order routine tests such as glucose level checks and cholesterol measurements. Blood tests are crucial in exploring potential causes of persistent symptoms like unexplained illness, unusual bruising, fatigue, or weight loss. Blood tests are also essential before blood transfusions to ensure blood type compatibility. People with chronic conditions like diabetes or high cholesterol often undergo routine blood testing to monitor their condition and the effectiveness of treatments. Whether routine and preventative or diagnostic, blood tests are an excellent way to aid in the early identification of several health issues and diseases to facilitate swift treatment interventions.