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

Q. Is RAT or RT-PCR more accurate when taking COVID test?

Answered by
Dr. Vishal Patidar
and medically reviewed by iCliniq medical review team.
This is a premium question & answer published on Feb 24, 2022

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.



Welcome to icliniq.com.

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 you have your first symptom? What are the medications you are taking? Are you vaccinated? Please answer the above to help you better.

Thank you.

Thank you doctor,

I was dealing with normal sinus issues, mainly postnasal drip. I took a home RAT that came back negative. I then went to a testing facility and had another RAT done to be sure. That one also came back negative. Later I had more sinus issues, sneezing, runny, stuffy nose, and a little sinus pressure. After a day, I felt much better, so I did another home RAT to follow-up, and this time it came back positive. I then went to another facility to have a RAT done, and that one came back positive as well. What does that mean? I do not have any symptoms anymore. I received the Pfizer vaccine, but I am not eligible for a booster. I am not currently taking any medication. Please advise.



Welcome back to icliniq.com.

The RAT test may sometimes show false negative or false positive, or maybe the viral load was less or the sample was not appropriately taken earlier. Still, as of now, you tested positive. If your symptoms are relieved, then there is no need to take medications, but you have to isolate yourself and follow approved guidelines for preventing COVID. If you live with someone, get them tested too. Please get appropriate medical attention on time if you have any symptoms or anything else.

Thank you.

Was this answer helpful?


Same symptoms doesn’t mean you have the same problem. Consult a doctor now!

Related Questions:
My 6-year-old daughter has fever and diarrhea. Are these signs of COVID-19?

Is it symptom of COVID-19, typhoid, or dengue ... As per your description, this may be a symptom of COVID-19 ...   Read full

Are COVID-19 Patients Infectious for up to 90 Days After Recovery?

An increasing number of recovered COVID-19 patients are allegedly reporting back to hospitals with lingering COVID-19 symptoms, such as   Read full

COVID-19 Lateral Flow Test

Origin of Coronavirus 2019 The COVID-19 pandemic caused by the novel coronavirus (SARS-CoV-2) has been posing a severe threat to human life and health since its dis   Read full

Also Read Answers From:

ideaComprehensive Medical Second Opinion.Submit your Case

Also Read

PCOS and Liver Problems
The hormonal imbalances in polycystic ovary syndrome could cause liver diseases. Read the article to know the relationship between these medical conditions.  Read more»
Inferior Alveolar Nerve Lateralization Technique
The inferior alveolar nerve lateralization technique is a surgical lateralization technique to reposition the nerve. Read the article to know more about this.  Read more»
COVID-19 and Ebola: Similarities and Differences
This article gives a comparison and broader overview of the outbreak of the two deadliest diseases that showed a greater incidence over the last two decades.  Read more»

Ask your health query to a doctor online?

Ask an Internal Medicine Physician Now

* guaranteed answer within 4 hours.

Disclaimer: No content published on this website is intended to be a substitute for professional medical diagnosis, advice or treatment by a trained physician. Seek advice from your physician or other qualified healthcare providers with questions you may have regarding your symptoms and medical condition for a complete medical diagnosis. Do not delay or disregard seeking professional medical advice because of something you have read on this website. Read our Editorial Process to know how we create content for health articles and queries.