Histopathology can help your doctor arrive at a possible treatment plan after looking at the analysis of at a little piece of tissue from the skin, liver, kidney or other organ. This is known as a biopsy. They analyze the tissue cautiously under a magnifying instrument, searching for changes in cells that could make sense of what is causing a patient's disease.
Histopathology offers an indicative support for cancer; they handle the cells and tissues eliminated from dubious 'bumps and tumors', distinguish the nature of the anomaly and, if dangerous, give data to the clinician about the sort of cancer it is.
The Goal of this test is to identify the nature of the tumor and classify it as malignant or not. And if it is malignant, than identify it as the cell of a particular cancer.
If you have had tumors taken out of your body, then the doctor will recommend the test to you.
Yes it is very reliable. The test has been the gold standard in Oncological Diagnostics.