Why do I need a vitamin B test?You may need this test if you have symptoms of a vitamin B deficiency. Symptoms vary depending on which B vitamin is deficient, but some common symptoms include:RashTingling or burning in the hands and feetCracked lips or mouth soresWeight lossWeaknessFatigueMood changesYou may also need testing if you have certain risk factors. You may be at a higher risk for a vitamin B deficiency if you have:Celiac diseaseHad gastric bypass surgeryA family history of anemiaSymptoms of anemia, which include fatigue, pale skin, and dizziness
