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Losing weight without trying? Blood tests your doctor may ask for

Losing weight on purpose is one thing; losing it while eating normally is different and should not be ignored. Losing more than about 5% of body weight in 6–12 months without a reason is something doctors take seriously. Common treatable causes like diabetes and an overactive thyroid show up in simple blood tests, which is a good first step along with a doctor visit.

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Tests to ask about

HbA1c / blood sugar

Uncontrolled diabetes is a common, treatable cause of weight loss.

₹420 Book Details
Thyroid profile (T3, T4, TSH)

An overactive thyroid can burn weight quickly.

₹1,200 Book Details
Complete blood count (CBC)

Shows anaemia and signs of infection.

₹330 Book Details
ESR

A raised ESR suggests inflammation or a long-standing infection and guides further tests.

₹130 Book Details
Liver function test (LFT)

Checks liver health and protein levels.

₹790 Book Details

Common reasons doctors look for

  • Uncontrolled diabetes – often with thirst and frequent urination
  • Overactive thyroid – often with fast heartbeat, sweating and anxiety
  • Long-standing infections such as TB
  • Stomach and digestion problems that reduce absorption
  • Stress, depression or loss of appetite
  • Sometimes more serious illness, which a doctor needs to evaluate

How to prepare

If fasting blood sugar or a lipid profile is included, fast 10–12 hours (water is fine). Thyroid, CBC, ESR and HbA1c do not need fasting.

When to see a doctor

Do not wait only for tests – see a doctor if weight loss comes with fever or night sweats for weeks, cough longer than 2 weeks, blood in stool or vomit, difficulty swallowing, a lump anywhere, or yellow eyes. Very high sugar with vomiting, deep breathing or drowsiness is an emergency.

Weight Loss Without Reason – FAQs

What blood tests are done for weight loss?

Common first tests are blood sugar/HbA1c, thyroid profile, CBC, ESR, liver and kidney function. Your doctor may add more based on examination.

Can thyroid cause weight loss?

An overactive thyroid speeds up the body and can cause weight loss despite good appetite, along with palpitations and heat intolerance.

Can diabetes make you lose weight?

Yes. When sugar is very high, the body loses sugar in urine and may lose weight. Thirst and frequent urination often come along.

Is a blood test enough?

Blood tests are a useful start, but unexplained weight loss needs a doctor's examination. Take your reports to the doctor.

This page is general information, not medical advice or a diagnosis. Please talk to a doctor about your symptoms.

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