Diagnosing cancer in its earliest stages typically offers the greatest chance of a cure. Various studies indicate that screening tests can save lives by detecting cancer early for a few types of cancer. However, for some malignancies, screening tests are only advised for individuals at greater risk. Some companies provide at-home cancer test kits, which include everything a patient needs to take a sample and send it in for analysis. These screening tests may require the patient to provide blood, stool, urine, saliva, or vaginal swab samples. Different test kits have different requirements. These samples are then analyzed for various biomarkers (like antibodies, antigens or mutated genes) that can be used as an early warning system for the development of cancer. Some of these test kits may be recommended by doctors for those with a moderate risk of acquiring certain malignancies.