An ammonia test measures the amount of ammonia in the blood. Most ammonia in the body forms when protein is broken down by bacteria in the intestines . The liver normally converts ammonia into urea, which is then eliminated in urine. Ammonia levels in the blood rise when the liver is not able to convert ammonia to urea. This may be caused by cirrhosis or severe hepatitis. For this test, a blood sample may be taken from either a vein or an artery.
Deduction Amount hide... The deduction is equal to the cost of the vehicle's engine, the equipment used to store or deliver the fuel, and the equipment used to exhaust combusted gases, up to a maximum of $2,000 for vehicles places in service by the end of 2005.
In an effort to educate taxpayers regarding their obligation to file accurate tax returns, this fact sheet, the fifth in a series, explains the rules for deducting car and truck expenses. Ordinarily, expenses related to use of a car, van, pickup or panel truck for business can be deducted as transportation expenses. Use of larger vehicles, such as tractor-trailers, is treated differently and is not part of this discussion. Traveling from one work location to another within the taxpayerâs tax home area.