Vitamin B12

This test is recommended if you have:

• Persistent fatigue or unexplained weakness
• Numbness, tingling, or a 'pins and needles' sensation in the hands or feet
• Memory problems or difficulty concentrating
• A strictly vegetarian or vegan diet without supplementation
• A history of digestive surgery or conditions affecting nutrient absorption
• Long-term use of medications like metformin or proton pump inhibitors