Is cotinine detected in blood or just urine? i have a blood test for tobacco in 4 days. i stopped smoking last night. averaged 5 to 7 cigs a day.

See below: Cotinine may be tested in blood, urine and saliva. It is good that you stopped using tobacco for the test. It will be a very good idea to not start smoking or using tobacco again. Five days is usually sufficient to clear out nicotine. See this site for more info: https://labtestsonline.org/understanding/analytes/nicotine/tab/sample

Depends: it can be tested in both blood and urine, although most people use the urine test because it remains positive longer than the blood test. Depends on the sensitivity of the test they use; most of the time, cotinine will become positive 72 hours out or so. Please STAY stopped, not because you are being tested, but because smoking will damage your health and likely lead to a premature death.

Probably won't pass.: “When someone stops using tobacco & nicotine products, it can take more than 2 weeks for the blood level of cotinine to drop to the level that a non-tobacco user would have & several weeks more for the urine level to decrease to a very low concentration.” REF: http://labtestsonline.org/understanding/analytes/nicotine/tab/test/