About McGraw-Hill's Diagnosaurus 2.0®

McGraw-Hill's Diagnosaurus 2.0, the FREE medical software app, is completely updated for the new age in healthcare and used by tens of thousands of students, physicians, and health professionals. Download the FREE Diagnosaurus 2.0 tool which has 1000+ differential diagnosis to help you make informed decisions. Diagnosaurus 2.0 is derived from McGraw-Hill's most trusted Quick Answers on AccessMedicine.

Diagnosaurus 2.0 DDx Tool

* If you have already downloaded Diagnosaurus in the past, then the 2.0 version will automatically download to your handheld once you sync.


Roni F. Zeiger, MD
Clinical Instructor of Medicine
Stanford University School of Medicine


Diagnosaurus provides differential diagnoses (DDx) of symptoms, signs, and diseases. By using the pulldown menu, you can choose to view entries by organ system, or select to view the list of symptoms only, the list of diseases only, or all of the entries. For example, if you wish to review the causes of a patient's chief complaint, simply select the symptom or sign from the alphabetical listing. If you have made a diagnosis and wonder what other disorders to consider, select your diagnosis from the list to see its DDx.

In medicine, the terms "differential diagnosis" and "etiology" often overlap. They are sometimes distinct and sometimes synonymous. In Diagnosaurus, "DDx" is generally used when either term can apply. However, many entries have both an etiology list and a DDx. In these cases, the etiologies are the possible causes of the condition, while the DDx is the list of alternative diagnoses. For consistency, etiology is always listed before DDx. A few entries also have a list of "associated conditions" or "types." To navigate between these headings, you can tap the lower half of the screen to scroll down and skip to the next screen, use the pulldown menu, or use the up and down arrows to the right of the headings.

Note that every entry is linked to related entries by way of the "See Related DDx" feature. For example, while viewing the DDx of psoriasis, you may wish to see the related DDx of scaly lesions. This feature also helps label a patient's presenting syndrome and thus leads you to the best differential diagnosis. In the example above, if the rash reminds you of psoriasis, you might start with the psoriasis entry and then link to the differential diagnosis of scaly lesions.

The bookmark feature allows you to: