Unlike some blood tests that require fasting, a BMP test does not typically require you to fast beforehand. You can usually have a BMP done at any time of the day, whether you've eaten recently or not. However, it's essential to follow your healthcare provider's specific instructions, as some situations may warrant fasting or other preparations before the test. If you have any concerns or questions about the BMP test, consult your healthcare provider, who can provide guidance tailored to your individual health needs.