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.
Bottom Line. Generally, only small business owners and those who use their cars for business expenses besides commuting can deduct the price of gas on their taxes. According to the IRS tax topic 510, if you use your car for both personal and business expenses, only the business expenses can be deducted.ottom Line. Generally, only small business owners and those who use their cars for business expenses besides commuting can deduct the price of gas on their taxes. According to the IRS tax topic 510, if you use your car for both personal and business expenses, only the business expenses can be deducted.