Covid-19 Testing

Diagnostic tests and Antibody tests are the two types of COVID-19 tests. Of the two, the former detects active COVID-19 infection using a nasal or nasopharyngeal swab, whereas the latter detects a past infection with the help of blood. Diagnostic tests are further divided into Antigen tests like Rapid and Molecular tests like the RT-PCR, NAAT, LAMP test. One should get tested for COVID-19 if he/she has symptoms of COVID-19 or had close contact with an infected person, or engaged in activities without social distancing.

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All the answers published in this website are written by verified medical doctors, therapists and health experts. The Content has been moderated by iCliniq medical review team before publication. Post your medical clarifications on iCliniq by choosing the right specialty and get them answered. Your medical queries will be answered 24/7 by top doctors from iCliniq.

Why did my COVID test come negative and after two days positive?

Query: Hello doctor, I have a question regarding a negative and positive COVID-19 test. I have received both in three days, and I am not sure what to believe. I need another opinion. Please advise. Thank you.  Read Full »

Dr. Vishal Patidar

Answer: Hello, Welcome to I understand your concern. Can you please tell me in detail when were you tested positive and when negative? Have you done the RT-PCR (reverse transcription-polymerase chain reaction) or RAT test (rapid antigen tests)? What are your current symptoms, and when did yo...  Read Full »

What is the quarantine period for a COVID-positive person? Is it necessary to do a re-test post quarantine?

Query: Hi doctor, I have tested positive for COVID today. How long should I be in quarantine, and is it required to do the test again? If so, when should I take the test?  Read Full »

Dr. Nagaraj

Answer: Hi, Welcome to I can understand your concern. As per the guidelines, you should isolate yourself for two weeks to prevent spreading the infection. A re-test is usually recommended two to three days before completing isolation. It is equally important that you watch out for symptoms l...  Read Full »

I tested positive for COVID 19 and have a low-grade fever, sinus drainage, throat tickle, and gastrointestinal symptoms. Kindly help me.

Query: Hi doctor,I started having gastrointestinal symptoms. I tested myself for COVID the last Sunday, and I was positive. I did not think I had COVID. Except for the low-grade fever, sinus drainage, and a throat tickle, I feel fine. I cough maybe two or three times, like one cough, and sometimes there is...  Read Full »

Dr. Shubadeep Debabrata Sinha

Answer: Hello, Welcome to Thanks for your query. The crucial factor is whether you have been vaccinated against COVID-19 (two primary vaccines with or without booster dose with at least about four to six weeks gap from the second primary dose to develop optimal antibody levels) and also influ...  Read Full »

What should I do after getting COVID infection?

Query: Hello doctor, I experienced symptoms of COVID. I am not sure if it is only a mild symptom, but I think it is not. I had a fever, headache, body pain, and runny nose. The fever lasted for three days, but I still have body pain and cough. I am at home; I immediately isolated myself. What should I do ...  Read Full »

Dr. Goswami Parth Rajendragiri

Answer: Hi, Welcome to the Following is my opinion on your asked question. You have all the symptoms of COVID-19 infection. However, if the patient has a fever, sore throat, and body weakness, then immediately COVID testing by reverse transcription-polymerase chain reaction (RT-PCR) or rapid t...  Read Full »

Do my symptoms of cough, cold, fever, throat pain, and chest pain suggest COVID-19 infection?

Query: Hi,Since morning I have had symptoms like cough and cold, fever (38 degrees celsius), throat pain, and pain under the chest. I have never had a COVID infection before. Currently, I am taking cold and flu medication. Do these symptoms suggest that I have a COVID-19 infection?  Read Full »

Dr. N. Ashok Viswanath

Answer: Hi, Welcome to I read your query and understand your concern. The symptoms you are having right now are due to an infection of the respiratory tract. It could be due to bacterial origin (Streptococcal infection) or viral origin (COVID-19). During this COVID-19 pandemic, I suggest you ge...  Read Full »

Will I be positive for COVID-19 antigen if I had the infection a month ago and tested negative on the ninth day?

Query: Hello doctor,I tested positive on a rapid antigen test one month back and negative by day nine. I need to retake a rapid antigen test to return to the western country. Can I safely assume I will continue to show up as negative? I am worried that the rapid antigen test will somehow pick up the COVID-...  Read Full »

Dr. J N Naidu

Answer: Hello, Welcome to You have already tested negative, and the chances of again becoming positive are negligible. Let us hope for the best.  Read Full »

What is the cause for having a cough with phlegm for a long period?

Query: Hi doctor, I have had my cough with phlegm for almost a month now. I have had two swab tests already, and both got negative for COVID results. What can I do to be relieved of my cough? I am taking Ascof Lagundi, and in the past, I used to take Solmux. Kindly help me.  Read Full »

Dr. Muhammad Zubayer Alam

Answer: Hi, Welcome to I can understand your concern. According to your statement, you have been suffering from a cough with phlegm for almost a month. Your RT-PCR (reverse transcriptase-polymerase chain reaction) for COVID-19 tests were negative. Cough with phlegm for a month may resu...  Read Full »

Does my symptomatic friend have a COVID-19 infection if he tests negative?

Query: Hi doctor,My friend's COVID-19 test is negative. Test says "suggestive COVID-19," and lungs are more than 50% infected. His oxygen levels are normal, and he is constantly monitoring oxygen levels. He is unsure about the medicines given to him and is stuck in a place with not much access to big hospi...  Read Full »

Dr. Muhammad Zubayer Alam

Answer: Hi, Welcome to Thank you for the query. I can understand your concern. The recent HRCT (high resolution computed tomography) of the chest has revealed patchy and sub-segmental ground-glass opacities associated with inter and intralobular septal thickening and architectural distort...  Read Full »

Can only one partner test positive for COVID?

Query: Hi doctor, I need advice for me and my wife. She is 5 months pregnant. We both went for a covid test as I became ill and had all the symptoms of COVID-19. My wife did not have any symptoms but she was also tested as she is pregnant and we had a lot of contacts. The results came back yesterday. My w...  Read Full »

Dr. Utkarsh Sharma

Answer: Hi, Welcome to I understand your concern and I will definitely help you regarding it. It is important to note that the sensitivity of RT-PCR (reverse transcription-polymerase chain reaction) test in detecting covid infection is around 70 percent only which means that only 70 out o...  Read Full »

What is the cause for CRP (C-reactive protein) value rise in COVID-19 patients?

Query: Hi doctor, My brother was tested positive for COVID and was under home isolation. His CT score on sunday morning was 10/25, progressive, and CRP was 10. The next day he developed a 1020F fever, and we admitted him to the hospital. CRP score at the time of admission was 90 mg/L. The medication start...  Read Full »

Dr. Muhammad Zubayer Alam

Answer: Hello, Welcome to Thank you for the query. I can understand your concern. CRP (C-reactive protein) is an acute-phase protein. During infectious or inflammatory disease states, CRP levels rise rapidly within the first six to eight hours and may peak at a level of up to 350 to 400 mg/L ...  Read Full »

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