Detection of vitamin deficiencies in patients with fatigue, anemia or neurological complaints, with appropriate-dose replacement and long-term monitoring.
Indication
- Unexplained fatigue, exhaustion and difficulty concentrating
- Megaloblastic anemia due to low B12 or folic acid
- Low vitamin D level, bone pain or muscle weakness
- Vegetarian, vegan patients or those with dietary restrictions after bariatric surgery
- Long-term use of proton pump inhibitors, metformin or anticonvulsants
- Numbness in the hands and feet and balance problems (suspected B12 neuropathy)
- Folic acid and B12 evaluation before and during pregnancy
Preparation
- 8-12 hours of fasting before blood tests (for accompanying tests)
- A list of vitamins, herbal products and supplements being used
- Information about dietary habits (consumption of meat, dairy and eggs)
- Reporting of previous gastrointestinal surgeries or diseases
How it's performed
- The physician takes a detailed history of symptoms, nutrition and medications
- Complete blood count, B12, folic acid, ferritin and 25-OH vitamin D levels are measured
- When needed, homocysteine, methylmalonic acid and parathyroid hormone are requested
- Oral tablets or intramuscular injections are planned according to the type of deficiency
- A high-dose loading and maintenance schedule is shared with the patient
- Nutritional advice and factors contributing to deficiency are addressed
Post-procedure
- Follow-up complete blood count and B12 level 1-2 months after B12 injection
- Repeat 25-OH vitamin D and calcium check 2-3 months after vitamin D treatment
- Monitoring of hemoglobin response during folic acid replacement
- Transition to maintenance dose once levels reach the target range
- Referral to gastroenterology for underlying absorption problems
Risks
- Hypercalcemia (elevated blood calcium) at very high vitamin D doses
- Local pain or, rarely, allergic reaction after B12 injection
- Masking of underlying B12 deficiency with high-dose folic acid
- Drug interactions and laboratory changes from uncontrolled supplements
FAQ
Is high-dose weekly vitamin D safe?
Weekly or monthly high-dose schedules are used depending on the level of deficiency. The dose and duration should be determined by your physician and not continued long-term without follow-up.
Are injections always needed for B12 deficiency?
Intramuscular injections are preferred in patients with neurological findings or absorption problems. In mild deficiencies, high-dose oral B12 may also be effective.
Do multivitamins prevent vitamin deficiencies?
General multivitamins may help reduce some deficiencies, but they do not contain doses sufficient to treat significant deficiencies. The treatment plan should be individualized.
Related Information
Related Medical Services
Other services in the same specialty or with similar indications you may want to explore.
Osteoporosis monitoring and treatment
Internal Medicine Outpatient Services
Long-term monitoring of bone loss with DEXA, blood tests, and medication therapy.
Treatment of Calcium Metabolism Disorders
Internal Medicine Outpatient Services
Treatment of calcium metabolism disorders — approach to hypo- and hypercalcemia and the parathyroid hormone axis.
IV fluid / infusion therapy
Internal Medicine Outpatient Services
IV fluid / infusion therapy — supportive treatment in which fluids, electrolytes and intravenous medications are administered in a controlled manner.
General Internal Medicine Consultation
Internal Medicine Outpatient Services
General internal medicine consultation — diagnosis, follow-up, and referral of systemic conditions in adults.
Anemia Diagnosis and Treatment
Internal Medicine Outpatient Services
Anemia diagnosis and treatment — investigation of causes of anemia and planning of appropriate therapy.
Geriatric Patient Assessment
Internal Medicine Outpatient Services
Geriatric assessment — a comprehensive review of physical, cognitive, and social health in individuals aged 65 and older.
Hypertension Monitoring and Treatment
Internal Medicine Outpatient Services
Hypertension monitoring and treatment — diagnosis, medication, and lifestyle management of high blood pressure.
Obesity and Metabolic Syndrome Management
Internal Medicine Outpatient Services
Obesity and metabolic syndrome — comprehensive medical evaluation, follow-up, and lifestyle management.