Questions tagged [test]

This tag should be used for questions about Biomedical tests used in diagnosis of health conditions.

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10
votes
1answer
90 views

Can the specificity of a COVID-19 antibody test be improved by testing twice?

My question is fairly simple: There is a COVID-19 antibody test with a worst-case specificity of 98%, meaning that it yields potentially up to 2% false positives. While that number is not bad it is ...
9
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0answers
171 views

Is there any figure about the accuracy of COVID-19 tests? [duplicate]

Recently I saw the local media (Romania) presenting a case that was initially considered COVID-19 positive and two subsequent tests led to negative results. As far as I know no official bothered to ...
7
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2answers
144 views

What medical tests a man should take regularly to check for common health issues?

What medical tests should a man living in a relatively developed area take regularly to check for most common diseases? I'm interested in monthly and yearly basis.
6
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1answer
243 views

Why were so many Covid-19 negative tests among close contacts of the early Chinese cases?

In an ECDC report from Jan 17, it is said that In China, 763 close contacts have been identified and monitored. Of these, 644 have completed the observation period, while 119 remain under medical ...
6
votes
1answer
117 views

How do they test COVID-19 in drive-thru labs?

I've read that SARS-CoV-2 virus which causes COVID-19 disease can be tested with RT-qPCR.[1] It seems a somewhat lengthy procedure. Then it's unclear to me: how do they test the virus in drive-...
6
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1answer
170 views

What is the "best" or most accurate way to measure bodily hydration?

We all know that there are important benefits to good hydration. No question there. I recently heard about a study (unfortunately I didn't catch the author's name) concluding that water is not close ...
5
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5answers
313 views

Why are people with COVID-19 symptoms being denied tests in the US?

I have heard several times now, from both people I personally know and from others who have posted their stories online that they do not qualify for COVID-19 testing. From the stories I have heard, ...
5
votes
1answer
251 views

How would I know whether I am lactose-intolerant? Are there any tests?

I suspect that I might be lactose-intolerant, but I don't know how to tell. Can I just see a doctor and get tested, or do I have to live with the assumption? If there are any standardized tests, how ...
5
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2answers
121 views

Has China announced any results from their massive (new) COVID-19 testing program in Wuhan?

About 10 days ago China announced a plan to test the entire population (~11 million) of Wuhan. And more recently they've announced testing over 1 million per day in the city. But have any results been ...
4
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1answer
79 views

Can a RT-PCR test claim 100% sensitivity and specificity?

A recent RT-PCR test for SARS-CoV-2 from a private laboratory lists the test's sensitivity and specificity as 100%. The test certificate lists this next to the result: Ref. value/Норма Negative (...
4
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2answers
163 views

Can the capacity for COVID-19 tests be amplified by testing multiple samples mixed together and testing each only if positive?

If I understand it right, the following steps are to be taken into account: Taking the sample: for the proposed method more samples would have to be taken. Transporting the sample: more samples ...
3
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2answers
898 views

Is it possible that COVID-19 virus exist in a human body, but be absent from samples taken from nose and back of throat?

As specified in this link, COVID-19 tests start with taking samples from the nose or back or throat of people. Based on growth rate of this disease, I thought what if those samples are not positive (...
3
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2answers
143 views

Technology prospects for genome sequencing at home and data protection

Ever since the end of the Human Genome project we have been witnessing the steady advance of genome sequencing technology and the decline of the price required to perform it. This lead to the advent ...
3
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1answer
36 views

Is there an inexpensive test (IE: perhaps a form of litmus paper?) for keeping tabs on oral pH at home?

My initial research into the effect of oral pH on health I came across an article that suggests that using fluoride products in an acidic environment has many negative effects on health and that 32% ...
3
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0answers
68 views

Are false negative/positive results of COVID tests independent probabilistic events?

The gist of it Though there are many types of Covid tests, I think none have 100% sensitivity or specificity. What I would like to know is if the event of getting, e.g., a false negative on two tests ...
3
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0answers
46 views

Have cases of Covid-19 virus "reactivation" been noticed in countries besides China and South Korea?

April 10 news: South Korean officials on Friday reported 91 patients thought cleared of the new coronavirus had tested positive again. [...] Jeong Eun-kyeong, director of the Korea Centers for ...
3
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0answers
128 views

What are the testosterone tests that I can take to prove that my low libido is really a testosterone problem?

I understand that ( correct me if I am wrong) the Sex Hormone Binding Globulin ( SHBG) test is one of the tests that can be used to evaluate one's libido. The sex hormone binding globulin (SHBG) ...
2
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2answers
122 views

Antigen vs PCR test

In the Czech Republic there is now mandatory testing for factory employees. Anecdotally I am now being told by people I am acquainted with, who run medium sized firms here, that their employees are ...
2
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2answers
380 views

Is South Korea doing "random" testing to combat covid-19 epidemic?

It is well-known that South-Korea has developed a powerful system of drive-through testing allowing them to test hundreds of thousands of person in the past two months. I was wondering whether the ...
2
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1answer
341 views

What is the correct way to use the pinch test for dehydration?

My understanding is that the test works by pinching the back of your own hand for two seconds, then letting go. If the pinch "immediately" returns flat you are not dehydrated but if it doesn't, you ...
2
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1answer
261 views

Is there a way to test for covid 19 after recovery?

I had symptoms that could have been corona symptoms last week. Unfortunately the testing capacity in my country (Germany) is not sufficient to test every person with symptoms at the moment, so only ...
2
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1answer
134 views

Why isn't saliva sampling used when sampling for the presence of respiratory diseases?

Previously I've asked a question focused on COVID-19: Why did countries initially presume that detecting COVID-19 requires a deep nasal swab? @Fizz provided the following response: So clearly it was ...
2
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1answer
36 views

What is the best protocol and criteria or policy for COVID-19 novel coronavirus testing?

What is the best protocol and criteria or policy for COVID-19 novel coronavirus testing? During early U.S. infections, the criteria have been stringent due to limited test availability. As tests ...
2
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1answer
63 views

Which tests for Coronavirus/COVID19 are available and why seem they be so different?

Lately I'm reading about the good Coronavirus-Tests in South Korea, the faulty tests in the USA and the tests in Indonesia which are according to some Singapore newspapers not even working. I wonder ...
2
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1answer
34 views

What's the margin of error for the estimate on the percentage of people infected with latent tuberculosis?

According to a 2011 (news) article in Science More than a third of the world's population is estimated to be infected with Mycobacterium tuberculosis. Most people's immune system can keep the ...
2
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1answer
43 views

How often is a Ct of 30 (or more) using the Charité protocol a false positive for Covid-19?

A French case report that has received widespread media attention suggests (actually stated in pretty strong terms in the paper) that Covid-19 was already spreading in France in December 2019. (In ...
2
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1answer
67 views

Is there a graph over time of Covid-19 test positivity rate in the US?

Back in mid-April some commentary/news was that the US was not doing enough testing as evidenced by the test positivity rate: America’s 20 percent positivity rate is disquieting. The U.S. did almost ...
2
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1answer
130 views

Are there methods available to determine ongoing cell damage in Covid-19 survivors?

It took years for many of those first infected with Hepatitis-C, to learn that it was destroying their livers. It took years for those with HIV to learn their immune systems were being destroyed. Is ...
2
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1answer
200 views

Are false positives from Cellex’s Coronavirus antibody test systemic?

The FDA just approved the first antibody test for the Coronavirus, made by Cellex. The test has a significant false positive rate though (see here). Now for a lot of tests, false positives can be ...
2
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1answer
50 views

How well can we test for deadly reactions to a drug, like anesthetics for an operation? [closed]

Since I still hear about people dying from adverse effects of anesthesia, prescription drugs, and clinical trials, we obviously don't have a perfect ex vivo test for adverse reactions to arbitrary ...
2
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1answer
66 views

How and where to test for organic mercury levels?

I tried to find information about this online but unfortunately couldn't find anything besides more or less serious-looking articles explaining the different kinds of mercury poisoining, etc... I'm ...
2
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0answers
63 views

Is there a possibility of transmission of COVID-19 during sample collection process?

Is there a possibility of transmission of COVID-19 during sample collection process from safety kits worn by sample collecting person to the suspected infected person whose sample is being collected? ...
2
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0answers
62 views

Is there a colorblindness test for non-verbal children?

The colorblindness tests that I have seen have all relied on getting a verbal answer from the test subject. Examples are "What number do you see in this picture?". Most people can follow a test ...
2
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0answers
51 views

Can having other coronaviruses like HCoV-OC43 give positive results when testing for SARS-CoV-2? [closed]

Is it possible that a person having coronaviruses other than SARS-CoV-2 test positive for SARS-CoV-2 in rapid (antibody testing kits) as well as RT PCR tests? Searching around the internet didn't ...
2
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0answers
35 views

Can two different medications in the same bottle contaminate one another.

Last week, I went to my pain control doctor, I came up positive for an opiate I do not take. The gal who works for me, asks Me all the time if sheshe can put her pills in my pill bottle. We do manual ...
2
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0answers
51 views

Online Genetic Test Repositories

I've found out that NCBI's Genetic Testing Registry database holds quite a large collection of genetic/genomic tests available. However, it is a database where producers/researchers submit their ...
2
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0answers
23 views

What are basic checks to be done yearly [closed]

I am a reasonably healthy 47 yo male. Not hypochondriac. I am wondering which basic medical tests should be performed, and in which cycle. I am thinking about tests per se (blood, urine,...), ...
2
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0answers
900 views

EverlyWell - legit?

EverlyWell is a lab testing startup. I'm looking at their food sensitivity test, didn't find a whole lot of independent info online (other than blogger reviews that were paid by the company). Is it ...
1
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3answers
439 views

What is the principal goal in pooled COVID-19 testing?

Pooled testing for COVID-19 is being considered as a method to ramp up testing Stat News. Apparently this is being considered by the White House coronavirus team. It's not clear to me what the goal of ...
1
vote
1answer
33 views

COVID-19: Is it possible to use the specimen collected through swabs for multiple tests

I am an engineer and currently doing some modeling of COVID-19 testing from a math perspective. I was reading through COVID-19 articles related to testing and I had the following doubt: If a ...
1
vote
1answer
88 views

Having tested positive for COVID-19, will future tests be positive?

The World Health Organization indicates the COVID-19 genome is detected in assays. Once a patient tests positive, is there any reason not to expect that future instances of the same assay will result ...
1
vote
1answer
55 views

Why is the US not implementing large scale random Covid-19 testing to isolate asymptomatic people? [closed]

For this question, we will define surveillance as large scale random Covid-19 testing. It is my understanding that: surveillance enables the sorting of asymptomatic patients to be immediately ...
1
vote
1answer
101 views

is 1.319 IU/ML Helicobacter Pylori IGG normal?

Doctor suggested me H-pylori Stool test & now I have the report which indicates: Test Name:Helicobacter Pylori IgG Result:1.319 IU/ML Normal Ranges: < 0.9 --> Negative 0.9-1.0 --> ...
1
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1answer
25 views

How often is SARS-CoV-2 RNA detected in plasma, for patients otherwise diagnosed?

I'm curious how sensitive the earliest retrospective diagnoses for SARS-CoV-2 (in China) might be. According to the paper which put the earliest case to December 1, 2019 that retrospective diagnosis ...
1
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1answer
77 views

Why does CDC's RT-PCR protocol for Covid-19 use the N gene, but the Charite one the E gene and RdRp?

The Charite protocol mentioned among other things that Of note, the N gene assay also performed well but was not subjected to intensive further validation because it was slightly less sensitive. ...
1
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2answers
73 views

Is there a convenient self test for Glaucoma?

I was identified as a glaucoma suspect and told to get rechecked for glaucoma annually. Knowing that glaucoma can move more quickly than that I was spooked and wound up creating my own self test. If ...
1
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0answers
19 views

How are the FPR and FNR estimated for a new diagnostic test?

Let's consider a case of a test for presence/absence of a viral infection. When we have certainty as to whether a specific individual is carrying the virus, it is easy to estimate the False Positive ...
1
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0answers
149 views

For how long does one test positive for COVID-19 after being infected with COVID-19?

I read on https://www.thehealthy.com/infectious-disease/how-long-can-you-test-positive-for-covid/ (mirror): According to the CDC, you can test positive up to three months after exposure even though ...
1
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0answers
26 views

Covid-19: what's (usually) the probability of getting a negative PCR result conditioned on getting a positive antigen test result first?

It's been pointed out to me that most studies comparing antigen with PCR tests either consider these as independent tests carried out over the whole sample (and report concordance/discordance that way,...
1
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0answers
23 views

Is there a simple way to quantify viral content beeing exhaled by a person potentially independent of the specific virus type?

As far as I have understood it, persons who have contacted virusses (that are to a substantial part transmitted through the air, such as covid-19) tend to be only or most strong infectuous during a ...