Before drawing blood for a glucose test, what is the most important instruction to give to the patient regarding preparation?
1
Avoid eating or drinking anything other than water for 8-12 hours before the test.
2
Consume a high-carbohydrate meal the evening before the test.
3
Perform vigorous exercise for at least 30 minutes before the test.
4
Drink at least two liters of water immediately before the test to ensure hydration.