Questions tagged [blood-tests]
Questions about tests of the blood that help to estimate the component(s) in it.
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Why should someone's titres be checked before getting an MMR vaccine?
Many years ago, I was in an ER and they wanted to know when I had last had a tetanus shot. I was a young adult, newly in charge of remembering such things, and had no idea. There was quite a lot of ...
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Why are iron levels different in the left and right hands?
Yesterday I donated blood. When the nurse performed a finger prick test of iron using my left hand, she indicated that the level was too low. However, she then asked to perform the test again on my ...
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The technological limitation of information extraction from a drop of blood
In light of the sentencing of Elizabeth Holmes just now, I would like to ask if there is a technological limitation for extracting the full spectrum of test information from a drop of blood. This ...
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What is the principle behind PCR/NAAT test, in the context of HIV, especially compared to antigen/antibody test?
So here's my limited understanding of how viral infections work.
Some virus enters the body and causes an infection. The virus then begins to replicate itself. It takes some time for there to be ...
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Meaning of "lower limit of normal + 20% over basal value" in a description of a blood lactate analysis (after glucose load)
From "Alpers- and MNGIE-like disease with disturbed CSF folate transport and an unusual mode of genetic transmission of POLG mutations: a case report":
Basal serum lactate was normal (1.1–1....
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What causes air bubbles/air glugs when getting blood drawn with a vacutainer system?
As I understand it, the vacutainer system used in modern phlebotomy should never result in air bubbles “glugging” into the vacutainer tube when blood is drawn from a patient.
However, today I learned ...
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Multiple blood-type results [closed]
What would be the reason for multiple blood-type results for one person? All taken from 2 hospitals (best hospitals in the state), doctor's offices, blood donations.
Blood drawn after birth (written ...
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Can false positives/negatives be reliably detected by redoing the test?
As the title states, I'm wondering whether simply redoing a test is a valid means of eliminating the risk of a given result being false.
The question is specifically about repeating the same exact ...
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Blood tests for borrelia and their informative value
Disclaimer:
I am here as a highly medically interested person looking
for an explanation of an observed phenomenon, not for medical advice,
as it is not about my person.
I work in a diagnostic ...
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What are the basic reasons for normogonadotropic hypogonadism?
I'm can't fine the full known scope of reasons of male normogonadotropic hypogonadism.
From this article I see the two basic reasons:
Gonadal dysgenesis variants (residually functioning ovarian ...
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Can the HS-Omega-3 Index be calculated from EPA and DHA?
I want to test my levels of Omega 3s, and I'm curious if it makes sense to test both the HS-Omega-3 Index and the EPA (Eicosapentaenoic Acid) & DHA (Docosahexaenoic Acid), or just the latter?
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Is it considered eosinophilia if the total eosinophil count is normal but the eosinophil percentage is high?
If the total eosinophil count is normal but the eosinophil percentage is high, is it considered eosinophilia, or is it merely grounds for a rerun of the test?
In a paper by Kovalski and Weller (2016), ...
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Blood count and adenovirus vaccines
Some covid-19 adenovirus vaccines including AstraZenca and Johnson & Johnson are found to have potential link to a rare albeit serious side effect resulting in blood clots with low platelets, ...
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Will there be any error in the result if the sample taken for COVID-19 RT PCR test is kept for days before performing the test?
What would be the impact of keeping the sample (nose swab) for 5 days before performing RT-PCR on it? If no, then is there a particular way of storing the sample.
Is there any standard set by the ...
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What would be the chances of catching HIV when getting a blood donation from a man who has sex with Men?
Around the world organizations that seek blood donations usually have a policy to discourage men who have sex with men (MSM) from donating blood. This is due to the risk of Human Immunodeficiency ...
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