Preparation depends on the exact test ordered. Some blood tests require fasting while many do not. Follow the instructions given by your clinician or laboratory, continue medicines unless a clinician tells you otherwise, and mention supplements or medicines that may be relevant. If you are unsure whether fasting is needed, confirm before your appointment.
Medical information note
This article is for general education and is not a diagnosis or a substitute for advice from a qualified healthcare professional. Seek urgent medical attention for severe or rapidly worsening symptoms.