Questions tagged [blood]

The liquid that circulates in the arteries and veins of humans and other vertebrate animals, carrying oxygen to and carbon dioxide from the tissues of the body, or an internal bodily fluid that performs a similar function in invertebrates.

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11
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1k views

Are platelet donations more needed then whole blood?

A few months ago I showed up to donate blood and said I was willing to do any type of donation. I ended up getting dragged into donating platelets instead, which I admit I hadn't even realized was an ...
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What are risks associated with injection made by a non-sterile needle?

On a regular vaccination, I've been handled by an unprofessional staff, who ( while preparing the injection needle) touched her hands 2 times to the injection needle (staff wore the gloves, but they ...
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Does infectious hemophilia exist?

Coagulopathies or bleeding disorders, like hemophilia, and Von Willebrand's syndrome, are diseases in which the blood's ability to coagulate is impaired. But, is there an infectious disease that can ...
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Why is heparin contraindicated in patients with severe hypertension?

Heparin is a parenteral anti coagulant- prevents clot formation by inhibiting factors 2 a and 10 a mainly. Now, patients with severe uncontrolled hypertension- have persistent bp of more than 140/90. ...
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63 views

The state of glucose in the blood

I have a simple question regarding glucose and the blood, for which I have not been able to find a satisfactory answer through some independent research through Google. How is the glucose in the blood ...
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54 views

Is it necessary to hydrate before doing a double red cell blood donation?

So, I gave blood today, as is my habit about every 112 days, going on the apharesis machine to do a double red donation. After the donation, as usual, I found myself having to urinate more often than ...
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percentage volume of vascular tissue in transtibial residuum

I'm a mechanics researcher and I'm working on modeling transtibial residual tissue for designing (hopefully) better prothesis. One of the challenges of this topic is to account for the influence of ...
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Does Water Affect Aggregation/Clumping of Red Blood Cells?

I am developing a laboratory experiment that involves looking at human blood under a microscope. In particular, I will be looking at how the red blood cells aggregate or clump when a human subject is ...
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Can eating chalk cause very low level haemoglobin level?

My friend has a haemoglobin level of 6 g/dl. She eats a lot of chalk. The doctor said that the chalk accumulation is hindering the production of haemoglobin. Does that make sense, or there might be a ...
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35 views

Is the frequency of Korotkoff beats equal to the pulse rate?

When measuring blood pressure using a sphygmomanometer (BP cuff), you listen for Korotkoff sounds caused by turbulent blood flow through the artery. They appear as beating noises. Is this beating ...
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Measuring Carotid pulse

The Mayo clinic advises us to use our index and long finger to take our carotid pulse: Is there a reason to not use other fingers? Do the others have stronger pulses that we want to avoid mistakening?...
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In what direction do the usual "warning factors" affect SpO2 measurements?

Perusing the manual of my home-use pulse oximeter it has the usual warnings easily found elsewhere on factors that may affect accuracy, but these are indicated qualitatively from "anemias" ...
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What is a normal lower limit for blood oxygen (sp02)?

I've noticed that my blood oxygen is nearly always in the 95-98 range whereas my wife is 98-99. I'm healthy with no known conditions whereas she has asthma. What is the normal range for healthy humans ...
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How do blood thinners stop the creation of platelets?

I know that with a cut sticky blood cells called platelets are used to prevent an extended amount of blood loss from the wound. How do blood thinners prevent this?
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Hyphema type that doesn't pool?

I'm gonna be honest here, I'm writing a story where a guy has the classical evil red eyes you can find everywhere, and I want to base it in science. I've thought about posting this on worldbuilding, ...
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Is uric acid processed/removed differently than other acids?

It is my understanding that uric acid is a byproduct of the body breaking down certain proteins, and if the body can not get rid of this acid fast enough it can lead to gout and other complications. ...
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Why is there a difference between venous bicarbonate and bicarbonate in ABG?

Lets say a serum blood test shows bicarbonate of 20mmol/l but an ABG of 15mmol/l, both tests taken 3 minutes apart in a person with acute metabolic acidosis with compensation. Can anyone explain why ...
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263 views

Why can't we give blood within 8 days after taking an anti-inflammatory?

I'm used to regularly giving my blood and other blood components (plasma and platelets), but I was surprised the other day to see that one should not proceed to the donation if they consumed anti-...
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Does erythrocyte aggregation serve a useful function?

Wikipedia states that erythrocyte aggregation causes disease: Conversely, the presence of rouleaux is a cause of disease because it will restrict the flow of blood throughout the body because ...
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428 views

How is blood cleared from the body after internal bleeding

How is blood that flows out of vessels during internal bleeding cleared from the area (by the body, not medical professionals) once the bleeding stops? I am assuming via the lymphatic system; but I've ...
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Is there a mathematical relationship between total blood volume and cardiac output / stroke volume?

I'm looking into the body's response to traumatic hypovolemia, and I was wondering if there exists a mathematical relationship between total blood volume (TBV) and stroke volume (SV). All of the ...
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Toxoplasmosis during pregnancy and blood donation

Can a person who was infected with toxoplasmosis during his or her mother's pregnancy donate blood? Or is it unsafe and thus rejected?
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Can I calculate the blood pressure and pulse based on a given blood loss

Is there a function, graph, guideline or rule where I can see how a change in blood volume changes other relevant values? E. g. for every 1% of blood volume lost, heart rate rises 2 beats per minute, ...
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Being excluded from blood donation due to using protein supplementation

I used another clinic from the ones I usually donate blood. The doctor that was responsible for taking my history in regards to approving me as a donor after the usual questions asked me if I use ...
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How can I take blood pressure into the cardiac output formula?

I wanted to know if there is some kind of formula that can help me calculate the cardiac output. So, lets say we have a standing person. The StrokVolume should be around 100 cm2 for the average adult, ...
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how many 'lives' are saved from one donation of blood?

The red cross claims that donating blood can 'save up to three lives' That seems a highly exaggerated best case scenario. I'm curious, how many lives are really saved from a unit of blood? ...
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Is low immature reticulocyte fraction after an acute hemolytic crisis normal?

All following data are theoretical and not real: A patient had a hemolytic crisis without anemia proven by elevated reticulocytes, elevated unconjugated bilirubin and normal hemoglobin and erythrocyte ...
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Would it make sense to use aspirin as a prophylactic against covid-related blood clotting?

Autopsies indicate blood clots are lethal in COVID-19. So what Is Known About COVID-19 and Abnormal Blood Clotting? I was trying to think of something that might cut down on deaths from covid-19, ...
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Haemopoiesis (blood cell development) in bone marrow

I am currently studying the textbook Hoffbrand's Essential Haematology, eighth edition, by A. Victor Hoffbrand and David P. Steensma. Chapter 1 Haemopoiesis says the following: During normal ...
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Why transfused blood has lower 2,3 - BPG levels

I read the following quote in the textbook Kaplan Biochemistry (2018 edition, page 183): Transfused blood has lower than expected 2,3 BPG levels, making it less efficient at delivering oxygen to ...
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95 views

What happens when you put O+ blood in O- body

What happens when you put O+ blood in a O- body? I know O- can be put in everywhere but what happens, when you put a blood group in a body that would fit the group, but mismatches the rhesus factor. I ...
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Why does hemodialysis need to done for so many hours?

Does hemodialysis take so many hours because the dialyser is inefficient (in other words, every time blood passes through the dialyser only a small fraction of the waste is removed) or because there ...
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90 views

Does vasodilation in one part of the body mean another part of the body must vasoconstrict?

The body has a set volume of blood, so when someone is given nitrates to vasodilate (primarily) their veins, would this not increase the total volume of the vessels in the body? If this is the case, I ...
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227 views

What did people do before the discovery of blood groups? [closed]

Today, we transfer our blood easily as we know our blood group. But what did people do before that discovery (in 1901 by Karl Landsteiner, then independently in 1906 by Jan Jansky and 1910 by William ...
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Does the blood removed from the body still have immunity?

I know that blood contains white blood cells (which attack pathogens). Suppose we take half a liter of blood out of the body and implant the virus into it. Can the white blood cells in that half a ...
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Does staying at high altitudes increase your stamina?

Let's say someone lives at sea level and then stays at an altitude of 2'500 m for three weeks. Her body will adapt by increasing the amount of red blood cells. In the end, her stamina will be as good ...
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1answer
79 views

Why can't simple blood transfusions be used for treatment of COVID-19, instead of plasma transfusions? [closed]

It has been recently been shown that convalescent plasma from previously infected patients can be used to help others gain immunity against the disease. But why do we need to use plasma for this ...
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Is it possible for humans to be resistant to certain viral infections without having specific antibodies in their blood?

Popular understanding of how viruses work split immunity into four categories: Virus doesn't affect humans at all No immunity - will get worst possible infection, seems to be the case with COVID-19 ...
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Average temperature of blood versus core body temperature

I have read the blood is warmer than the same body's core temperature. The core temperature is known to be 37 degrees, and I have been told the average blood temperature is 38 degrees. This was in my ...
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52 views

A study about blood differences and the risk for COVID-19

On healthline it's mentioned a recent study that came out of Wuhan, China; it’s published on a website, but hasn’t yet been reviewed by peers. In the study, scientists looked at the blood types of ...
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Is there a point of being an Organ Donor if my blood type is AB Negative?

What is the point of anyone being an organ donor if their blood type is AB Negative? What are the chances someone is going to need your organs at that specific time frame after you die? Or am I ...
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Does blood pressure have a daily pattern?

before nothing I am not a doctor, I am a simple programmer that likes to read about medicial sciencies. I've read in this book that the blood pressure it very important; is it really? Then I have ...
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How we can improve our Blood circulation? [closed]

Generally speaking, how we can improve our blood circulation ? Is there a special food or special posture ?
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What's the primary body entrance + surface of infection for catching the flu?

I realize there are multiple ways, but if you tallied up all the people who caught the flu or a cold last year, what would be the majority... Entrance for infection: Mouth Nose Eyes Ears Skin Bio ...
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Crystalloid infusion during anaphylactic shock

My text book states that intravenous crystalloid infusion is a method of treating anaphylactic shock. I can't get why, as there is no fluid loss in case of anaphylactic shock, at least that is what ...
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What are the health benefits of cold showers?

Apart from the increased circulation and sperm production (in men) what long term and short term benefits can you get with a cold shower every day? To clarify, short term effects such as immediate ...
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How reliable is the determination method of reference ranges for blood tests?

A reference range is usually defined as the set of values 95 percent of the normal population falls within (that is, 95% prediction interval). It is determined by collecting data from vast numbers ...
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Would gargling salt water every day increase sodium absorption levels?

Do you absorb sodium through your gums, mouth and throat when gargling and rinsing salt water? Considering the fact that sublingual medication is a very effective way for introducing substances ...
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Risks of blood donation with autoimmune diseases

People with autoimmune diseases are generally either forbidden or discouraged from donating blood. Example: People who have autoimmune diseases (such as autoimmune thyroid disease, ankylosing ...
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Can the foods you have been eating be detected through blood tests?

I know that things like sodium, cholesterol, and sugar levels can be found in blood (at least I think so.) But what about things like fruits and veggies? Can that be detected through bloodwork? Or ...