<s>[INST] some of us cannot afford to pay to see doctores, and that is me, I am on a tight budget so I do not go for blood tests etc. I think you lot could help hard up people at times. Everyone is money mad. I would never ask for money to help someone even though as poor as I am. [/INST] **1. Since blood tests require specific reagent to show whether the levels of different substances in your blood fall within a normal range, thus they can help you and your doctor learn more about your health and can help find potential problems early, when treatments or lifestyle changes may work best, but blood tests alone cannot be used to diagnose certain medical problems.2. Blood tests allow a doctor/physician to see a detailed analysis of any disease markers, the nutrients and waste products in your blood as well as how various organs (e.g., kidneys and liver) are functioning, so if examination or history doesn't reveal much about patient ailment thus laboratory tests are tools helpful in evaluating the health status of an individual3.  Since the most common tests are done using a blood sample, or with use of portable machines thus search in your area where the rates are low. </s>