U.S. Department of Health and Human Services


Diagnostic Tests

Computed Tomography (CT)

Explore the risks and benefits of computed tomography (CT) scanning, also called computerized axial tomography (CAT) scanning, a medical imaging procedure that uses x-rays to show cross-sectional images of the body.

Review Date: October 24, 2014

U.S. Food and Drug Administration

CDC Vitalsigns: HIV Testing in the US

An estimated 1.1 million people are living with HIV in the US and as many as 1 in 5 don’t know they are infected. Ask your doctor for an HIV test and find out your status.

Review Date: February 19, 2013

Centers for Disease Control and Prevention - CDC
U.S. Department of Health and Human Services

Common Screening and Diagnostic Tests for Women

Screening and diagnostic tests can help doctors identify or rule out a health condition a patient has. This chart lists diagnostic tests that your doctor might order for you.

Review Date: March 02, 2011

Office on Women's Health

Computed Tomography (CT): Questions and Answers

This fact sheet describes the CT scan procedure and its uses in diagnostics and treatment.

Review Date: June 01, 2015

NIH National Cancer Institute

Follow-up Care: Questions and Answers

This fact sheet provides information about follow-up medical care for patients who have completed cancer treatment.

Review Date: June 01, 2015

NIH National Cancer Institute

Interpreting Laboratory Test Results

Learn how laboratory tests are used to identify and diagnose possible changes in a person’s health.

Review Date: June 01, 2015

NIH National Cancer Institute


Find out how various x-ray, CT, MRI, ultrasound, radiation therapy and other procedures are performed. Learn about patient safety, what you may experience, and how to prepare for exams.

Review Date: November 09, 2012

American College of Radiology

What Is Cardiac CT?

Cardiac computed tomography, or cardiac CT, is a painless test that uses an x-ray machine to take clear, detailed pictures of your heart. The publication links to more information, including what to expect before, during, and after cardiac CT.

Review Date: December 17, 2014

NIH National Heart, Lung, and Blood Institute - NHLBI

When You Discover a Lump- (PDF)

This brief, step-by-step guide will help you to understand the steps doctors take to distinguish a benign from a cancerous lump, including diagnostic mammography, ultrasound, MRI and biopsy.

Review Date: June 27, 2012

Susan G. Komen for the Cure

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