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Published on: Jul 09, 2020
2 minute read
By: Dr Rakesh Choudhary

COVID- 19 Tests – What Do You Need To Know?

COVID- 19 tests – What do you need to know?

Author: Dr. Rakesh Choudhary MBBS, MS, FRCS UK, FRCS Orth UK, MChOrth UK.

Dr. Choudhary is a practicing consultant surgeon in the UK.

So many of us think it is not their job to learn about COVID-19 tests and this should be left for the experts and governments to decide about these tests. But I strongly suggest the public must have a basic understanding of these tests which they may have to have themselves.

Basically there are two types of tests, one which can detect the virus in the body and the other one which tells if the person had the previous infection.

Virus test

The virus test detects an active infection. It detects the genetic material (RNA) of the virus during an active infection. It is also called a PCR (polymerase chain reaction) test or nucleic acid test and is sometimes inaccurately called an antigen test.

A swab is taken from deep in the back of your throat and deep in the nose. The swab should go deep up to 7-8 cm and is generally uncomfortable for the patient. Swabbing patients using the correct technique is paramount in ensuring an accurate result. By simply swabbing the inside of the nasal passage is not deep enough to verify that the virus is present.

What does virus testing tell you?

This test tells us if a patient is actively infected with the COVID-19 virus. Virus testing is used mainly for the diagnosis of COVID-19.

When should it be done?

The virus test works best during the first seven days of symptoms.

The coronavirus can be detected in swabs even before symptoms of illness first appear . This is why people can be infectious for a few days before the onset of symptoms, which usually appear about 5 days after the virus infects. Some people have no symptoms throughout their infection but are positive on the virus test and infectious to others. After a few days of illness, the concentration of the virus falls (as seen in swab samples) and the symptoms of the illness usually recede.

Accuracy of the test

In a person with COVID-19, the test is less likely to give a positive result late in the course of infection once the virus has been cleared by the immune system, or if an inadequate sample is taken from the nose or throat. There are concerns that the rate of ‘false negative’ test results could be as high as 30% and a significant number of people are wrongly being told they do not have the virus.

Antibody test

Antibody tests check your blood by looking for antibodies, which may tell you if you had a past infection with the virus that causes COVID-19. Antibodies are protein structures that are produced by the immune system in response to certain infections. The antibody can help fight off infections and can provide protection against getting that disease again (immunity). Antibodies are disease-specific. For example, measles antibodies will protect you from getting measles if you are exposed to it.

The antibody test detects the presence of antibodies as a marker of past infection. The antibody test (blood test) will only detect infections after the immune system has produced antibodies that recognize the virus. This happens approximately 7–10 days after symptoms develop.

Tests carried out a week after a patient develops symptoms will detect only 30% of people who had COVID-19 infection. Accuracy increases to 72% at two weeks and to 94% in the third week. Some people may take even longer to develop antibodies, and some people who are infected may not ever develop antibodies.

Interpretation of the antibody test is complex for non-medical people. Basically having antibodies to the virus that causes COVID-19 may provide protection from getting infected with the virus again. If it does, we do not know how much protection the antibodies may provide or how long this protection may last.

Read Blog

How Inflammation Affects Overall Health: Understanding the Hidden Risks

Inflammation is often misunderstood. While it is a vital protective response of the immune system, persistent or chronic inflammation can quietly damage tissues and increase the risk of serious diseases. Understanding how inflammation affects overall health is crucial in preventing long-term complications and maintaining optimal wellbeing.

According to the World Health Organization and global medical research published in Lancet, chronic inflammation is linked to a wide range of non-communicable diseases, including heart disease, diabetes and autoimmune disorders.

What Is Inflammation?

Inflammation is the body’s natural response to:

infection
injury
toxins
stress

It activates immune cells to eliminate harmful stimuli and promote healing.

There are two main types:

Acute Inflammation

Short-term and protective.
Examples include swelling after injury or fever during infection.

Chronic Inflammation

Long-term, low-grade inflammation that persists even without injury.

Chronic inflammation is harmful.

How Chronic Inflammation Develops

Persistent inflammation can result from:

unhealthy diet
sedentary lifestyle
obesity
chronic stress
environmental toxins
untreated infections

Modern lifestyle patterns contribute significantly to this condition.

Impact on Heart Health

Inflammation damages blood vessels and promotes plaque formation.

This increases risk of:

heart attack
stroke
hypertension

ICMR data highlights cardiovascular disease as a leading cause of death in India, with inflammation playing a contributing role.

Link Between Inflammation and Diabetes

Chronic inflammation interferes with insulin signalling.

This leads to:

insulin resistance
elevated blood sugar
metabolic syndrome

NFHS-5 data shows rising diabetes prevalence, partly linked to inflammatory lifestyle factors.

Effect on Joint and Muscle Health

Inflammatory processes contribute to:

arthritis
joint stiffness
muscle pain

Autoimmune diseases often involve chronic inflammation.

Gut Health and Inflammation

The gut plays a central role in immune regulation.

Poor diet and stress disrupt gut balance, triggering:

inflammatory bowel conditions
digestive discomfort
nutrient malabsorption

Gut inflammation impacts systemic health.

Brain Health and Inflammation

Emerging research suggests chronic inflammation affects:

memory
mood
cognitive performance

Inflammatory markers are associated with depression and neurodegenerative disorders.

Chronic Fatigue and Inflammatory Stress

Persistent inflammation causes:

ongoing fatigue
reduced stamina
sleep disturbances

The immune system remains in constant activation mode.

Role in Autoimmune Disorders

Autoimmune diseases occur when the immune system mistakenly attacks healthy tissues.

Chronic inflammation is central to conditions such as:

rheumatoid arthritis
lupus
inflammatory bowel disease

Signs of Chronic Inflammation

Symptoms may include:

unexplained fatigue
persistent joint pain
digestive issues
frequent infections
skin problems

Early detection is important.

Lifestyle Factors That Increase Inflammation

High Sugar Intake

Excess sugar promotes inflammatory pathways.

Processed Foods

Trans fats and additives trigger immune responses.

Sedentary Lifestyle

Lack of exercise reduces anti-inflammatory benefits.

Poor Sleep

Sleep deprivation increases inflammatory markers.

Chronic Stress

Elevated cortisol disrupts immune balance.

Natural Ways to Reduce Inflammation

Anti-Inflammatory Diet

Include:

leafy greens
fruits rich in antioxidants
nuts and seeds
whole grains

Avoid excessive processed foods.

Regular Physical Activity

Exercise lowers inflammatory markers and improves circulation.

Stress Management

Meditation and breathing exercises reduce stress hormones.

Adequate Sleep

7–8 hours of quality sleep supports immune regulation.

Maintain Healthy Weight

Excess abdominal fat produces inflammatory chemicals.

Role of Preventive Health Screening

Regular tests such as:

blood sugar
lipid profile
inflammatory markers

help monitor risk factors early.

Importance of Early Intervention

Unchecked inflammation increases risk of:

cardiovascular disease
metabolic disorders
organ damage

Timely lifestyle changes reverse early inflammatory effects.

Long-Term Health Benefits of Inflammation Control

Reducing inflammation supports:

heart health
stable blood sugar
improved immunity
enhanced cognitive function
reduced pain

Preventive strategies protect long-term wellbeing.

Conclusion

Understanding how inflammation affects overall health reveals its profound impact on the heart, brain, gut and metabolic systems. While acute inflammation protects the body, chronic inflammation silently contributes to major diseases. Fortunately, lifestyle changes such as balanced nutrition, regular exercise, quality sleep and stress management significantly reduce inflammatory burden. Prevention and early monitoring remain the most effective tools for protecting overall health and ensuring long-term vitality.

References

World Health Organization (WHO) – Chronic Disease and Inflammation Reports
Indian Council of Medical Research (ICMR) – Cardiovascular and Metabolic Health Studies
National Family Health Survey (NFHS-5) – Diabetes and Hypertension Data
NITI Aayog – Preventive Healthcare Strategy Reports
Lancet – Inflammation and Chronic Disease Research

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