Vitamin B2 (Riboflavin)

You should get a vitamin B2 (riboflavin) test if you have cracked lips, mouth sores, a sore red tongue, skin rashes, light sensitivity, or itchy eyes. It is also recommended for people with alcoholism, malabsorption, thyroid disorders, or a poor diet, pregnant women, and those with unexplained anemia or fatigue.

Fasting for 8–12 hours is usually recommended before a vitamin B2 (riboflavin) test, and you may drink water during this time. Avoid alcohol for 24 hours before the test. Inform your doctor about any vitamin B2, B-complex, or multivitamin supplements, as you may need to stop them temporarily. Follow your lab's instructions.

Yes, fasting is usually recommended for a vitamin B2 (riboflavin) test. You should fast for 8–12 hours before giving your sample, though drinking water is allowed. Avoid alcohol for 24 hours beforehand, and inform your doctor about any vitamin B2 or B-complex supplements you take, as they can affect the results.