A test comes negative but the disease was present in subject. This is:
**Core Concept**
False negative results can occur in various medical tests due to several factors, including test sensitivity, specificity, and the presence of interfering substances. False negative results can lead to misdiagnosis and delayed or inadequate treatment.
**Why the Correct Answer is Right**
A false negative result occurs when a test incorrectly indicates the absence of a disease or condition when it is actually present. This can be due to various factors, such as the test being less sensitive than expected, the presence of interfering substances in the test sample, or the disease being in its early stages. In such cases, the test may not detect the disease or condition, leading to a false negative result.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not specified, so it cannot be evaluated.
**Option B:** This option is also not specified, so it cannot be evaluated.
**Option C:** This option is also not specified, so it cannot be evaluated.
**Clinical Pearl / High-Yield Fact**
False negative results can occur due to various factors, and it is essential to consider these factors when interpreting test results. A repeat test or additional testing may be necessary to confirm the diagnosis.
**Correct Answer:** D.