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Cannot sleep well? Blood tests that can uncover hidden causes

Most sleep trouble comes from stress, screens late at night, irregular routines or too much tea and coffee. But some physical problems also disturb sleep: an overactive thyroid can keep you wired, low iron can cause restless legs at night, and high sugar can wake you up to urinate. Blood tests help rule these out, while snoring and daytime sleepiness need a doctor's check for sleep apnoea.

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Tests to ask about

Thyroid profile (T3, T4, TSH)

An overactive thyroid often causes restlessness and poor sleep.

₹1,200 Book Details
Ferritin / Iron profile

Low iron stores are linked with restless legs at night.

₹250 Book Details
Vitamin D (25-OH)

Commonly low in India and linked with tiredness.

₹1,300 Book Details
Vitamin B12

Low B12 can affect mood and energy.

₹1,090 Book Details
HbA1c

High sugar can wake you at night to urinate.

₹420 Book Details

Common reasons doctors look for

  • Stress, anxiety or low mood
  • Overactive thyroid – restlessness, sweating, fast heartbeat
  • Low iron stores causing restless legs at night
  • High sugar causing night-time urination
  • Sleep apnoea – loud snoring, pauses in breathing, daytime sleepiness
  • Late screen time, caffeine or irregular shift work

How to prepare

Thyroid, vitamin D, B12 and ferritin need no fasting. If fasting sugar is included, fast 8–10 hours; for lipid profile 10–12 hours (water is fine).

When to see a doctor

See a doctor if poor sleep lasts more than a few weeks and affects your work or mood, if someone notices you stop breathing while asleep, or if you fall asleep while driving. If low mood comes with thoughts of self-harm, seek help immediately – call a helpline or go to a hospital.

Sleep Problems – FAQs

Can a blood test find the cause of insomnia?

Blood tests cannot diagnose insomnia, but they can show thyroid problems, low iron, vitamin deficiencies or high sugar that may disturb sleep.

Can low iron affect sleep?

Low iron stores are linked with restless legs syndrome, an urge to move the legs at night that disturbs sleep. Ferritin checks your iron stores.

Is snoring a reason to get tested?

Loud snoring with daytime sleepiness can be sleep apnoea, which needs a doctor and often a sleep study. Doctors may also check sugar, thyroid and cholesterol as apnoea is linked with them.

Can vitamin D affect sleep?

Some studies link low vitamin D with poorer sleep. It is easy to check and commonly low in India.

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

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149 tests included · Report in 24–48 hours
  • ARTHRITIS (2)
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139 tests included · Report in 24–48 hours
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