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The Daily Insight

How do I read my FISH test results?

Author

Sarah Oconnor

Updated on April 24, 2026

How your doctor interprets this test is as follows:

  1. A result of 0 is negative.
  2. A result of 1+ is also negative.
  3. A result of 2+ is considered equivocal (uncertain).
  4. A result of 3+ is positive.

What does a FISH test detect?

Fluorescence in situ hybridization (FISH) is a test that “maps” the genetic material in human cells, including specific genes or portions of genes. Because a FISH test can detect genetic abnormalities associated with cancer, it’s useful for diagnosing some types of the disease.

Is it better to have HER2-positive or negative?

Is HER2-positive breast cancer good or bad? HER2-positive cancer tends to be poorer in terms of prognosis than HER2-negative cancer because: It grows faster. It is more likely to spread to the lymph nodes fast.

What does FISH test detect in pregnancy?

This testing allows preliminary detection of trisomy for chromosomes 13, 18, and 21, numerical abnormalities of the sex chromosomes, and triploidy (three sets of all chromosomes, resulting in 69 chromosomes). Prenatal interphase FISH can be performed on uncultured amniotic fluid, chorionic villi, or fetal blood cells.

What is FISH testing in lymphoma?

Fluorescence in situ hybridization (FISH) is a sensitive method to detect smaller genomic changes associated with various hematological malignancies and solid tumors.

WHAT IS A FISH test for pregnancy?

What is the FISH Test? FISH stands for Fluorescence In Situ Hybridisation. This is a special test which can be performed on uncultured amniocentesis or CVS samples. The result is usually available the next business day.

How accurate is FISH report?

Interphase FISH for detection of the common aneuploidies misses about 30% of all chromosome abnormalities detectable by standard cytogenetics even with 100% accuracy of the test.

How accurate is FISH test pregnancy?

FISH test results were found to be 100 % sensitive and 100 % specific in all these 8965 women. Therefore, FISH as a standalone test proved to be effective as a rapid and cost-effective strategy in these 99.3 % (8965/9033) amniotic fluid samples.

How long does it take for fish results to be available?

Because other tests cannot be performed until cancer cells have been growing in lab dishes for about two weeks, the process usually takes about three weeks. FISH results are usually available within a few days. 1 2

Can a fish test predict the outcome of cancer treatment?

When the type of cancer has previously been diagnosed, a FISH test also may provide additional information to help predict a patient’s outcome and whether he or she is likely to respond to chemotherapy drugs.

What is a fish test used for?

FISH Test (Fluorescence In Situ Hybridization) Fluorescence in situ hybridization (FISH) is a test that “maps” the genetic material in a person’s cells. This test can be used to visualize specific genes or portions of genes.

Who will review the results of the AML/MDS FISH panel?

Results are reviewed by both the laboratory manager and the director. The AML/MDS FISH panel includes the following probes. The morphologic interpretation and correlation of results on all cases is performed by a board-certified doctoral level scientist (laboratory director). The final report has a narrative description of results.