Advertisement

What is the difference between a screening test and a diagnostic test?

A screening test is given to those who have no symptoms of the condition in question. An example would be measurement of cholesterol levels in people who have no symptoms of cardiovascular disease. When a person does have symptoms, however, the picture changes, as the chance of uncovering something meaningful to health is considerably more likely once a person has a symptom or is at higher risk of a condition. Risk is best determined by a doctor when he or she checks your physical condition and "takes a history" -- asks about your signs, symptoms, and medical history in a complete and thorough way.

A diagnostic test is used to confirm a suspected condition once initial testing has revealed its possibility. Diagnostic tests are often more expensive and risky than initial tests. However, their usefulness should far outweigh their risk, or they should not be undertaken. An example of a diagnostic test would be cardiac catheterization (threading of a tube into the heart) if serious heart disease is suspected.

Continue Learning about Health Screening Tests

What is normal body temperature?
Dr. Jeanne Morrison, PhDDr. Jeanne Morrison, PhD
Normal body temperature is generally accepted to be 98.6°F or 37.0°C.  However body temperature vari...
More Answers
What health tests do I need to fast for?
National Academy of Sports MedicineNational Academy of Sports Medicine
"Your doctor or health professional should let you know if they want you to fast for a specific test...
More Answers
What are the benefits of preventive health screenings?
Mercy HealthMercy Health
Preventive health screenings have the benefit of detecting potential problems early. Preventive heal...
More Answers
Health Screenings You Need in Your 60s
Health Screenings You Need in Your 60sHealth Screenings You Need in Your 60sHealth Screenings You Need in Your 60sHealth Screenings You Need in Your 60s
Both men and women should get these tests. Have you had them yet? As you approach your retirement years, your health needs and concerns may be differe...
Start Slideshow

Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.