The most accurate method for assessing a patient's volume status is clinical correlation because it integrates multiple findings including physical examination, vital signs, laboratory data, and patient history. Reliance on a single parameter like central venous pressure, urine output, or imaging alone can be misleading due to individual variability and compensatory mechanisms. Bedside assessment of jugular venous pressure, mucous membrane moisture, skin turgor, and hemodynamic response provides a comprehensive and dynamic evaluation. This holistic approach ensures better-informed decisions about fluid management tailored to the patient's condition.

Reference: Harrison's Principles of Internal Medicine, 20th Edition.