Lethal Dose

Lethal dose (LD50) values are determined by the amount of a substance that:

• kills at least 50 individuals of the test population exposed to the substance

• kills a test population when given at least 50 ml of the substance

• kills at least 50% of the test population exposed to the substance

• kills a test population when given at least 50g of the substance

Toxicity is determined by

• dosage

• body weight of the victim

• how it enters the body

• chemical form of the substance

In what units are Lethal Dose50 (LD50) expressed?

• oz/lb

• mg/lb

• oz/kg

• mg/kg

Nothing with an LD50 can be good or useful at any quantity.

• True

• False

The LD50 for Vitamin A is 2000mg/kg, how many chewable vitamin tablets would a 10kg child have to consume to reach the LD50 if each tablet contains 1mg of Vitamin A

• 2000 tablets

• 20000 tablets

• 1000 tablets

• 10000 tablets