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Falling sick again and again? Blood tests to check your immunity

Catching every cold going around, repeated boils, urine or fungal infections, or wounds that take long to heal can be a sign that something is weakening your defences. Uncontrolled sugar is one of the most common hidden reasons in India. Blood tests can also show anaemia, vitamin deficiencies and white cell problems that make infections more likely.

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Tests to ask about

CBC with differential count

Shows white cell count – the body's infection fighters.

₹330 Book Details
HbA1c

Hidden diabetes is a common reason for repeated infections.

₹420 Book Details
Vitamin D (25-OH)

Vitamin D plays a role in immune function.

₹1,300 Book Details
Vitamin B12

Needed for healthy blood cells.

₹1,090 Book Details
HIV test

Recommended by doctors for repeated or unusual infections; reports are confidential.

₹560 Book Details

Common reasons doctors look for

  • High blood sugar – common cause of boils, fungal and urine infections, slow healing
  • Low vitamin D, B12 or iron
  • Low white blood cell count
  • Poor sleep, stress and poor nutrition
  • Untreated HIV or other long-term infections
  • Allergies being mistaken for repeated colds

How to prepare

CBC, vitamin D, B12 and HbA1c need no fasting. If fasting sugar or lipid profile is in your package, fast 10–12 hours (water is fine).

When to see a doctor

See a doctor promptly for fever that lasts more than 3 days, a spreading red painful skin area, a cough with blood, or infections that keep returning despite treatment. High fever with confusion, very low blood pressure or fast breathing needs emergency care.

Frequent Infections & Low Immunity – FAQs

Which tests check immunity?

There is no single "immunity test". Doctors usually start with CBC, HbA1c, vitamin D and B12, and may add HIV and other tests depending on the pattern of infections.

Why does sugar matter for infections?

High sugar weakens the body's defence and helps germs grow, so diabetes is checked in anyone with repeated boils, fungal or urine infections.

Is an HIV test confidential?

Yes, reports are shared only with you. Your doctor can explain the result and next steps privately.

My child falls sick often – is that abnormal?

Young children commonly get several colds a year. If infections are severe, need hospital care, or affect growth, talk to your paediatrician.

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

All of these in one package

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FEMALE CYCLE 1 package details

FEMALE CYCLE 1

184 tests included · Report in Report 72 Hours
  • ALLERGY
  • ANEMIA
  • ARTHRITIS (6)
  • AUTOIMMUNITY (7)
  • + 26 more
₹10,000
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AAROGYAM XL package details

AAROGYAM XL

149 tests included · Report in 24–48 hours
  • ARTHRITIS (2)
  • CARDIAC RISK MARKERS (7)
  • COMPLETE HEMOGRAM (28)
  • DIABETES (7)
  • + 14 more
₹9,999
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AAROGYAM X package details

AAROGYAM X

139 tests included · Report in 24–48 hours
  • ARTHRITIS (2)
  • CARDIAC RISK MARKERS (7)
  • COMPLETE HEMOGRAM (28)
  • DIABETES (7)
  • + 13 more
₹8,499
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AAROGYAM 1.8 package details

AAROGYAM 1.8

121 tests included · Report in 24–48 hours
  • CARDIAC RISK MARKERS (7)
  • COMPLETE HEMOGRAM (28)
  • DIABETES (5)
  • ELECTROLYTES (2)
  • + 10 more
₹6,999
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