(A) MgSO4is a central nervous system depressant. Loss of reflexes is often the first sign of developing toxicity. (B) Urinary output at <25 mL/hr or 100 mL in 4 hours may result in the accumulation of toxic levels of magnesium. (C) The therapeutic serum range for MgSO4is 6-8 mg/dL. Higher levels indicate toxicity. (D) Respirations of>16 breaths/min indicate that toxic levels of magnesium have not been reached. Medication administration would be safe.

Explanation/Reference:
Explanation:
(A) There will be no need to increase fluid intake excessively, because dumping syndrome could present a problem. (B) Followup visits every 3 weeks are not a standard recommendation. Follow-up visits will be highly individualized. (C) With removal of the stomach, intrinsic factor will no longer be produced. Intrinsic factor is necessary for vitamin B12 absorption. Parenteral injections of B12 will be needed on a monthly basis for the rest of the person's life. (D) Smaller, more frequent meals, rather than large, bulky meals, are recommended to prevent problems with dumping syndrome.

(A) Dinitrophenylhydrazine is a laboratory test used to detect phenylketonuria, maple syrup urine disease, and Lowe's syndrome. (B) Metachromatic stain is a laboratory test that may be used to diagnose Tay-Sachs and other lipid diseases of the central nervous system. (C) The blood serum phenylalanine test is diagnostic of phenylketonuria and can be used for wide-scale screening. (D) A lecithin-sphingomyelin ratio of at least 2:1 is indicative of fetal lung maturity, and survival of the fetus is likely.

Explanation
(A) Cranberry juice helps to maintain urine acidity, thereby retarding bacterial growth. (B) A generous fluid intake will help to irrigate the bladder and to prevent bacterial growth within the bladder. (C) Hand washing is an effective means of preventing pathogen transmission. (D) Restricting fluid intake would contribute to urinary stasis, which in turn would contribute to bacterial growth.

Explanation/Reference:
Explanation:
(A) Fresh vegetables and fruits are excellent sources of essential vitamins. (B) Canned and frozen foods have a high sodium content. Labels of all canned foods should be read to determine if sodium is used in any form. (C) Bread, cereal, and rice are excellent sources of carbohydrates. (D) Fish is an excellent source of protein.