Negative predictive value
Negative predictive value (NPV) is a statistical measure used in medical testing and diagnostic medicine. It is defined as the proportion of patients with negative test results who are correctly diagnosed. It is a critical measure in assessing the performance of diagnostic tests.
Definition[edit | edit source]
The negative predictive value is defined as the probability that a person with a negative test result is truly disease-free. It is calculated using the formula:
- NPV = TN / (TN + FN)
where TN is the number of true negatives and FN is the number of false negatives.
Importance[edit | edit source]
The NPV is an important measure in medical testing because it helps clinicians assess the accuracy of a test. A high NPV means that the test is reliable in ruling out the disease when the test result is negative. Conversely, a low NPV means that a negative test result is less reliable, and further testing may be needed to confirm the absence of disease.
Factors affecting NPV[edit | edit source]
The NPV of a test can be affected by several factors, including the prevalence of the disease in the population being tested and the sensitivity and specificity of the test. In general, the NPV increases as the prevalence of the disease decreases.
See also[edit | edit source]
References[edit | edit source]
Negative predictive value Resources | ||
---|---|---|
|
|
Translate to: East Asian
中文,
日本,
한국어,
South Asian
हिन्दी,
Urdu,
বাংলা,
తెలుగు,
தமிழ்,
ಕನ್ನಡ,
Southeast Asian
Indonesian,
Vietnamese,
Thai,
မြန်မာဘာသာ,
European
español,
Deutsch,
français,
русский,
português do Brasil,
Italian,
polski
Navigation: Wellness - Encyclopedia - Health topics - Disease Index - Drugs - World Directory - Gray's Anatomy - Keto diet - Recipes
Search WikiMD
Ad.Tired of being Overweight? Try W8MD's physician weight loss program.
Semaglutide (Ozempic / Wegovy and Tirzepatide (Mounjaro) available.
Advertise on WikiMD
WikiMD is not a substitute for professional medical advice. See full disclaimer.
Credits:Most images are courtesy of Wikimedia commons, and templates Wikipedia, licensed under CC BY SA or similar.Contributors: Prab R. Tumpati, MD