Fatigue blood test in Seoul: why am I always tired?

What a fatigue blood test in Seoul checks

Tiredness that does not lift with a weekend of rest is one of the most common reasons people see a doctor. A fatigue blood test in Seoul aims to find treatable medical causes such as anemia, low iron stores, thyroid problems, vitamin deficiencies and high blood sugar.

Dr. HyunSung Park starts with questions: how long, how severe, how is your sleep, mood, diet, periods, exercise and alcohol, and are you taking any medications? The answers decide which tests are worth doing, so you are not paying for a random panel.

The core tests and what they show

• Complete blood count (CBC): detects anemia and clues to its cause, plus infection or other blood changes.
• Ferritin: your iron stores. It can be low long before anemia appears, especially with heavy periods or a plant-based diet.
• Vitamin B12 and folate: low levels cause anemia, fatigue and sometimes tingling or memory problems. Metformin and acid-reducing medicines can lower B12.
• TSH: screens for an underactive or overactive thyroid.
• Vitamin D (25-OH-D): low levels are common in Korea and can be associated with aches and low energy.
• Glucose or HbA1c: screens for diabetes and prediabetes.
• Often added: kidney and liver function, electrolytes, CRP for inflammation, and pregnancy testing when relevant.

Common causes of tiredness, including the ones blood tests miss

Iron deficiency is the most frequent finding, particularly in menstruating women, frequent blood donors and people with gut conditions. In men and post-menopausal women, iron deficiency needs a search for blood loss from the gut, which may mean a referral for endoscopy or colonoscopy at a hospital.

Many causes of fatigue do not show up in blood at all: poor or short sleep, sleep apnea (loud snoring, waking unrefreshed), depression and anxiety, burnout, long working hours, jet lag, alcohol, low physical activity, recovery after a viral illness and medication side effects. When labs are normal, that is useful information, and we talk through these possibilities honestly rather than stopping at "your tests are fine".

Treatment: matched to the cause

Iron deficiency is treated with oral iron, or IV iron in a hospital setting when oral iron fails or is not tolerated, along with finding the source of loss. B12 deficiency may be treated with tablets or a B12 injection. Vitamin D can be replaced orally or by injection. Thyroid problems are managed with medication and monitoring.

IV vitamin drips are popular in Seoul for tiredness. They can be pleasant and hydrating, but there is limited evidence that they treat fatigue in people without a deficiency, and they are not a substitute for finding the cause. We will tell you if a drip is unlikely to help you.

Who this suits, and when to look further

A fatigue panel suits adults who have felt persistently drained for several weeks, especially with heavy periods, a vegetarian or vegan diet, a history of gut problems, recent pregnancy, long-term metformin or acid-reducing medication, or limited sun exposure. It is also sensible for expats who have not had routine blood work since moving to Korea.

It is not enough on its own if fatigue began suddenly with other symptoms, or if you have signs of a specific illness. Fatigue lasting more than six months that worsens after exertion may fit myalgic encephalomyelitis/chronic fatigue syndrome, which is diagnosed clinically after other causes are excluded. Suspected sleep apnea may need a sleep study, and significant depression or anxiety deserves dedicated care; we can help you find the right referral.

Red flags: when fatigue is urgent

Book a prompt visit if tiredness comes with unexplained weight loss, fevers or night sweats, swollen lymph nodes, heavy or unusual bleeding, black stools, persistent breathlessness or a new lump.

Go to an ER or call 119 in Korea if you have chest pain, severe shortness of breath, fainting, a very fast or irregular heartbeat, confusion, sudden weakness or numbness on one side, or thoughts of harming yourself. In a mental health crisis in Korea, you can also call 109, the national suicide prevention line.