The results of the BUN test will be contaminated if the patient is consuming certain drugs that cause problems with the blood sample. Before the BUN test, the patient should make the doctor aware of what medications are being consumed.
Vega body styles were used for several badge engineered variants. The 1973 to 1977 Pontiac Astre had Vega bodies (and Vega engines through 1976). The 1978 to 1979 Chevrolet Monza and Pontiac Sunbird wagons used the Vega Kammback wagon body with engines by Pontiac and Buick.
Chevrolet had originally planned to release the Cosworth Vega for the 1974 model year, but a burnt exhaust valve in a test engine caused the engine to fail the U.S. Environmental Protection Agency's 50,000-mile (80,000 km) emission control system durability test. This delayed the car's introduction until 1975.