Tricyclic antidepressants (TCA) are a class of drugs used to treat depression,anxiety,and other mood disorders. They work by increasing the levels of certain neurotransmitters in the brain， such as serotonin and norepinephrine. The uncut sheet version of the TCA test is a strip of paper that contains multiple test lines. When a sample of urine or blood is applied to the strip， it will change color if TCA is present in the sample. The number of lines that change color indicates the amount of TCA in the sample， with more lines indicating a higher concentration of the drug. It is important to note that while the TCA Uncut Sheet can be a useful tool for detecting drug use， it is not always accurate. False positives and false negatives can occur， so it is important to confirm the results with a more reliable method of testing， such as a laboratory-based test. Additionally， the use of this test should always be done in accordance with local laws and regulations.