Urinalysis and Body Fluids 6th Edition by Majorie DiLorenzo, Susan Strasinger

Exercise 24

Homocystinuria is caused by failure to metabolize:

A. Lysine

B. Methionine

C. Arginine

D. Cystine

Step 1 of 2

Homocystinuria:

Defects in metabolism of amino acid, methionine causes elevated homocystine in body.

• The elevated homocystine causes mental retardation, cataracts, thromboembolic problems, and even death

• Avoiding methionine containing food can lessen the metabolic problems

• New born screening program is available for screening of homocystine

Therefore, “methionine” metabolism failure causes homocystinuria. Hence, the correct answer is option.