Nutritional test in Seoul, targeted not random

What a nutritional test in Seoul covers

A nutritional test in Seoul at VEI Clinic is not a fixed package. Dr. HyunSung Park, a board-certified internal medicine specialist with an interest in functional medicine, chooses tests that answer your specific question, so you do not pay for numbers that will not change anything. Most people need only a handful of the tests below.

• Anemia and iron: complete blood count, ferritin, iron and transferrin saturation
• B vitamins: vitamin B12, with methylmalonic acid or homocysteine when results are borderline; folate
• Vitamin D (25-hydroxy vitamin D)
• Minerals when indicated: magnesium, zinc, copper, selenium
• Selected vitamins in specific situations: thiamine (B1), B6, vitamins A and E
• Metabolic context: kidney and liver function, lipids, HbA1c, CRP, and thyroid tests if symptoms suggest it
• Omega-3 index for some patients, sent to an outside lab

Who benefits from testing

Testing makes the most sense when there is a reason to suspect a gap. That includes people with ongoing fatigue, brain fog, hair shedding or brittle nails; vegetarians and vegans without reliable B12 intake; women with heavy periods; and anyone planning pregnancy. It also includes people at risk of poor absorption, such as those with celiac disease, inflammatory bowel disease, chronic gastritis or past stomach or bariatric surgery.

Some common medicines quietly affect nutrients. Long-term metformin can lower B12, and acid-reducing drugs such as PPIs can reduce absorption of B12, iron and magnesium. Athletes and people with very busy, irregular eating patterns in Seoul may also benefit from a check.

Testing is less useful if you feel well, eat a varied diet and simply want reassurance; in that case a standard checkup may be enough. It is also not the right tool for diagnosing food intolerance, hormone problems or the cause of chronic fatigue on its own. Fatigue in particular has many causes, from sleep apnea and low mood to thyroid disease, so Dr. Park may suggest a broader look if nutrition alone does not fit your story. Results also need context: ferritin, for example, can look normal or high during inflammation even when iron stores are low.

What we do not recommend, and why

We avoid broad, unvalidated micronutrient mega-panels and hair mineral analysis. Hair testing is prone to contamination from shampoos and dyes, and results do not reliably reflect what is in your body. Large panels also produce many slightly out-of-range numbers in healthy people, which can drive unnecessary worry and supplement spending.

Some specialized tests, such as red blood cell magnesium, are sometimes useful but have real limitations, so we discuss them before ordering and always read them in clinical context.

How to prepare

• Fast for 8 to 12 hours if lipids or glucose are included; water is fine
• Book a morning draw when possible, as some markers vary through the day
• Bring your supplement list with exact brands and doses
• Pause high-dose biotin for at least 48 hours unless prescribed, as it can distort some lab tests, including thyroid tests
• Do not stop any prescription medicine unless a doctor tells you to

Results explained 1:1 in English, and your plan

Routine results are usually ready within a few business days, while send-out tests take longer. Dr. Park reviews them with you in English, focusing on what matters now rather than every decimal point. You leave with a food-first plan, a supplement plan with sensible doses and timing, and a date to retest, often 8 to 12 weeks after changes.

More is not better with supplements. High-dose zinc can cause copper deficiency, excess vitamin D can raise calcium, and long-term high-dose B6 can damage nerves. If you are pregnant or breastfeeding, have kidney or liver disease, kidney stones or G6PD deficiency, tell us so the plan is safe for you. If you are clearly deficient and need faster correction, injections such as vitamin B12 or vitamin D can be discussed.

Red flags and limits

A nutrition test is not a substitute for investigating serious symptoms. Severe anemia, very abnormal electrolytes, unexplained weight loss, black or bloody stools, or numbness and weakness need medical treatment and further investigation, not just supplements. For fainting, chest pain, severe shortness of breath or confusion, call 119 or go to an emergency room.