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Essential medical blood tests for the elderly

Discover the essential blood tests every elderly person should take to monitor heart, kidney, liver, thyroid, bone, and overall health. Learn why these tests matter and how often to get them.

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Written by Dr. D Bhanu Prakash

Reviewed by Dr. Vasanthasree Nair MBBS

Last updated on 29th Aug, 2025

Introduction

As we age, our bodies undergo various changes, making regular health check-ups crucial. Blood tests are an essential part of preventive healthcare, helping detect potential issues early and ensuring timely treatment. For seniors, certain blood tests are particularly important to monitor overall health, detect diseases, and manage chronic conditions effectively.

In this article, we’ll discuss the most important blood tests for the elderly, why they matter, and how they help maintain good health.

Why Are Blood Tests Important for the Elderly?

Ageing increases the risk of chronic diseases like diabetes, heart disease, kidney problems, and thyroid disorders. Blood tests provide valuable insights into:

  • Organ function (kidneys, liver, heart)

  • Nutrient deficiencies (vitamins, minerals)

  • Infection or inflammation

  • Hormonal imbalances

  • Risk of chronic diseases

By getting these tests done regularly, seniors can stay proactive about their health and prevent complications.

Essential Blood Tests for the Elderly

Here are the most important blood tests recommended for older adults:

1. Complete Blood Count (CBC)

What it checks:

  • Red blood cells (RBCs) – for anaemia

  • White blood cells (WBCs) – for infections or immune disorders

  • Platelets – for clotting issues

Why it’s important:

  • Detects anaemia (common in seniors due to poor nutrition or chronic diseases).

  • Helps identify infections or blood disorders.

2. Blood Glucose (Fasting & HbA1c)

What it checks:

  • Blood sugar levels (fasting and average over 3 months via HbA1c).

Why it’s important:

  • Screens for diabetes or prediabetes.

  • Helps manage diabetes effectively.

3. Lipid Profile

What it checks:

  • Total cholesterol, LDL ("bad" cholesterol), HDL ("good" cholesterol), and triglycerides.

Why it’s important:

  • Assesses heart disease risk.

  • Guides dietary and medication adjustments.

4. Kidney Function Test (KFT)

What it checks:

  • Creatinine, blood urea nitrogen (BUN), electrolytes.

Consult Top Specialists for Personalised Tips

Dr. Chethan T L, General Physician/ Internal Medicine Specialist

Dr. Chethan T L

General Physician/ Internal Medicine Specialist

5 Years • MBBS, MD, DNB (General Medicine)

Bengaluru

Apollo Medical Center, Marathahalli, Bengaluru

550

Dr. Rajib Ghose, General Physician/ Internal Medicine Specialist

Dr. Rajib Ghose

General Physician/ Internal Medicine Specialist

25 Years • MBBS

East Midnapore

VIVEKANANDA SEBA SADAN, East Midnapore

950

850

Dr. Mohamed Azeem, General Physician/ Internal Medicine Specialist

Dr. Mohamed Azeem

General Physician/ Internal Medicine Specialist

2 Years • MBBS,MD(Internal Medicine) CCEBDM

Karaikudi

Apollo Hospitals Karaikudi, Karaikudi

450

450

Dr. Nirmal Mathew Alex, General Physician/ Internal Medicine Specialist

Dr. Nirmal Mathew Alex

General Physician/ Internal Medicine Specialist

17 Years • MBBS, MD(general medicine)

Angamaly

Apollo Hospitals Karukutty, Angamaly

recommendation

98%

(50+ Patients)

440

Why it’s important:

  • Monitors kidney health (kidney function declines with age).

  • Detects early signs of kidney disease.

5. Liver Function Test (LFT)

What it checks:

  • Liver enzymes (ALT, AST), bilirubin, and protein levels.

Why it’s important:

  • Detects liver damage or disease.

  • Essential for those on long-term medications.

6. Thyroid Function Test (TFT)

What it checks:

  • TSH, T3, T4 levels.

Why it’s important:

  • Hypothyroidism (underactive thyroid) is common in seniors, causing fatigue, weight gain, and depression.

7. Vitamin B12 & D Levels

What it checks:

  • Vitamin B12 (for nerve and blood health).

  • Vitamin D (for bone strength and immunity).

Why it’s important:

  • Deficiency can lead to anaemia, weakness, and bone loss.

8. Electrolytes (Sodium, Potassium, Calcium)

What it checks:

  • Balance of essential minerals.

Why it’s important:

  • Imbalances can cause weakness, confusion, or heart problems.

9. Prostate-Specific Antigen (PSA) (For Men)

What it checks:

  • PSA levels to screen for prostate issues.

Why it’s important:

  • Helps detect prostate enlargement or cancer early.

10. Bone Health Tests (Calcium, Phosphorus, ALP)

What it checks:

  • Bone density and risk of osteoporosis.

Why it’s important:

  • Prevents fractures and bone weakness.

How Often Should Seniors Get These Tests?

  • Yearly: CBC, Lipid Profile, Blood Glucose, Kidney & Liver Tests.

  • Every 6 months (if at risk): Diabetes, Thyroid, Vitamin Levels.

  • As advised by a doctor: PSA, Bone Health Tests.

Get Your Health Assessed

Tips for Healthy Ageing

1. Eat a Balanced Diet – Include proteins, fibre, vitamins, and minerals.

2. Stay Hydrated – Helps kidney function and digestion.

3. Exercise Regularly – Walking, yoga, or light strength training.

4. Monitor Medications – Some drugs affect kidney/liver function.

5. Get Regular Check-ups – Early detection saves lives!

When to See a Doctor?

If you experience:

  • Unexplained fatigue

  • Frequent infections

  • Sudden weight loss/gain

  • Dizziness or weakness

  • Changes in urination

  • Consult a doctor immediately.

Book Your Tests with Apollo 24|7

Regular blood tests can help seniors stay healthy and active. If you or a loved one needs these tests, Apollo 24|7 offers convenient at-home blood test services with accurate results and expert consultations.

Final Thoughts

Ageing is a natural process, but staying proactive with health checks can make a big difference. Regular blood tests help detect problems early, ensuring timely treatment and a better quality of life.

Take charge of your health today—schedule your tests and stay ahead of potential issues! Would you like to book a test or consult a doctor? Visit Apollo 24|7 now

Consult Top Specialists

Dr. Chethan T L, General Physician/ Internal Medicine Specialist

Dr. Chethan T L

General Physician/ Internal Medicine Specialist

5 Years • MBBS, MD, DNB (General Medicine)

Bengaluru

Apollo Medical Center, Marathahalli, Bengaluru

550

Dr. Rajib Ghose, General Physician/ Internal Medicine Specialist

Dr. Rajib Ghose

General Physician/ Internal Medicine Specialist

25 Years • MBBS

East Midnapore

VIVEKANANDA SEBA SADAN, East Midnapore

950

850

Dr. Mohamed Azeem, General Physician/ Internal Medicine Specialist

Dr. Mohamed Azeem

General Physician/ Internal Medicine Specialist

2 Years • MBBS,MD(Internal Medicine) CCEBDM

Karaikudi

Apollo Hospitals Karaikudi, Karaikudi

450

450

Dr. Nirmal Mathew Alex, General Physician/ Internal Medicine Specialist

Dr. Nirmal Mathew Alex

General Physician/ Internal Medicine Specialist

17 Years • MBBS, MD(general medicine)

Angamaly

Apollo Hospitals Karukutty, Angamaly

recommendation

98%

(50+ Patients)

440

Consult Top Specialists for Personalised Tips

Dr. Chethan T L, General Physician/ Internal Medicine Specialist

Dr. Chethan T L

General Physician/ Internal Medicine Specialist

5 Years • MBBS, MD, DNB (General Medicine)

Bengaluru

Apollo Medical Center, Marathahalli, Bengaluru

550

Dr. Rajib Ghose, General Physician/ Internal Medicine Specialist

Dr. Rajib Ghose

General Physician/ Internal Medicine Specialist

25 Years • MBBS

East Midnapore

VIVEKANANDA SEBA SADAN, East Midnapore

950

850

Dr. Mohamed Azeem, General Physician/ Internal Medicine Specialist

Dr. Mohamed Azeem

General Physician/ Internal Medicine Specialist

2 Years • MBBS,MD(Internal Medicine) CCEBDM

Karaikudi

Apollo Hospitals Karaikudi, Karaikudi

450

450

Dr P Jagadeesha Chandra, General Physician/ Internal Medicine Specialist

Dr P Jagadeesha Chandra

General Physician/ Internal Medicine Specialist

37 Years • MBBS, MD

Bengaluru

Apollo Hospitals Jayanagar, Bengaluru

900

Dr. Nirmal Mathew Alex, General Physician/ Internal Medicine Specialist

Dr. Nirmal Mathew Alex

General Physician/ Internal Medicine Specialist

17 Years • MBBS, MD(general medicine)

Angamaly

Apollo Hospitals Karukutty, Angamaly

recommendation

98%

(50+ Patients)

440

Consult Top Specialists

Dr. Chethan T L, General Physician/ Internal Medicine Specialist

Dr. Chethan T L

General Physician/ Internal Medicine Specialist

5 Years • MBBS, MD, DNB (General Medicine)

Bengaluru

Apollo Medical Center, Marathahalli, Bengaluru

550

Dr. Rajib Ghose, General Physician/ Internal Medicine Specialist

Dr. Rajib Ghose

General Physician/ Internal Medicine Specialist

25 Years • MBBS

East Midnapore

VIVEKANANDA SEBA SADAN, East Midnapore

950

850

Dr. Mohamed Azeem, General Physician/ Internal Medicine Specialist

Dr. Mohamed Azeem

General Physician/ Internal Medicine Specialist

2 Years • MBBS,MD(Internal Medicine) CCEBDM

Karaikudi

Apollo Hospitals Karaikudi, Karaikudi

450

450

Dr P Jagadeesha Chandra, General Physician/ Internal Medicine Specialist

Dr P Jagadeesha Chandra

General Physician/ Internal Medicine Specialist

37 Years • MBBS, MD

Bengaluru

Apollo Hospitals Jayanagar, Bengaluru

900

Dr. Nirmal Mathew Alex, General Physician/ Internal Medicine Specialist

Dr. Nirmal Mathew Alex

General Physician/ Internal Medicine Specialist

17 Years • MBBS, MD(general medicine)

Angamaly

Apollo Hospitals Karukutty, Angamaly

recommendation

98%

(50+ Patients)

440

Get Your Health Assessed

800(₹2000)60% off

398(₹995)60% off

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