Create a drug screen Your Laboratory can screen urine drugs of abuse for the fol

Question

Create a drug screen Your Laboratory can screen urine drugs of abuse for the following groups of test 1- Amphetamine 2-Barbiturates; 3-Benzodiazepine; 4-Cocaine; 5-Cannabinoids; 6-Opiates; 7-Methadone; 8-Phencyclidine The emergency department, request a urine drug screen for the following suspected drugs. Select the screen to use In order to prepare 100mL of 15 mg/dL BUN working standard from a stock standard containing 500 mg/dL of urea nitrogen, the number of mL of stock solution that should be used is: 3mL 5mL 33mL 75 mL

Explanation / Answer

C1*V1=C2*V2

C1=concentration of stock

V1=volume required from stock solution

C2=final concentration of solution after dilution

V2=Final volume of solution(total volume)

500mg/dL* V1=15mg/dL*100mL

=3mL

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