Review Question - QID 109691

A 23-year-old woman presents to the emergency department for vomiting and abdominal pain. She has been unable to eat or drink for the past 24 hours without vomiting. She also complains of worsening abdominal pain that started 3 days ago. The patient has a medical history of IV drug abuse and alcohol abuse. She is not on any current medications. Her temperature is 99.5°F (37.5°C), blood pressure is 127/68 mmHg, pulse is 120/min, respirations are 17/min, and oxygen saturation is 98% on room air. On physical exam, tenderness is elicited when the right lower quadrant of her abdomen is palpated. Deep palpation and release of the left lower quadrant of her abdomen also causes severe pain. Rectal exam reveals normal tone and stool is Guaiac negative. Laboratory studies are ordered as seen below.

Hemoglobin: 12 g/dL
Hematocrit: 36%
Leukocyte count: 11,500/mm^3 with normal differential
Platelet count: 197,000/mm^3

Serum:
Na+: 139 mEq/L
Cl-: 100 mEq/L
K+: 4.3 mEq/L
HCO3-: 27 mEq/L
BUN: 20 mg/dL
Glucose: 67 mg/dL
Creatinine: 1.1 mg/dL
Ca2+: 10.2 mg/dL
AST: 12 U/L
ALT: 15 U/L

Urine:
Cocaine: positive
Amphetamines: positive
ß-hCG: positive
Marijuana: positive
Heroin: negative
PCP: negative
MDMA: positive
Glucose: negative
Ketones: negative

Which of the following is the most appropriate next step in management?