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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38
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1answer
6k views

What is excess blood from blood donations used for, and do we ever run out?

I regularly donate blood, however, I am curious as to what happens to my blood after I donate. Obviously some of it will go to people in emergency medical situations, as I intend. However, I have ...
15
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1answer
9k views

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 ...
11
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3answers
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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? ...
11
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1answer
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 ...
10
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1answer
5k views

Does having more muscles influence blood pressure measurement?

As stated in the title, do we have any evidence that having a big muscular arm influence BP measurement?
9
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1answer
547 views

Is it possible to change person's blood group?

Is it possible to change person's blood group? I know it is not possible to change person's DNA, so what about blood group?
9
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386 views

Why does your head get enough blood and your feet don't when lifted above your body?

When I lift my feet up they go numb and don't get enough blood I suppose. Why isn't the same thing happening for my head in a normal upright posture?
9
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1answer
2k views

What are the hazards from smoking or drinking and then donating blood?

Why the donors are always advised not to smoke tobacco or drink alcohol for a particular amount of time before blood donation? What adverse effects can the receiver be subjected to if the blood of a ...
8
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1answer
114 views

What are plasma donations used for?

While a lot of blood donor websites online tell you what plasma is composed of, they don't seem to go into what it's used for. What are some potential applications of plasma donations, and is there ...
7
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2answers
678 views

Is lipaemia the same as hyperlipidemia?

I'm translating a Russian text and one of the sentences goes like this: Среди сывороток были образцы с гемолизом и липемией. The serum samples contained samples with hemolysis and lipaemia. I ...
7
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1answer
150 views

Why do surgeons wear blue aprons during surgeries?

In most cases, the surgeon wears a white apron, but during a surgery he is wearing a blue apron, why blue?
7
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2answers
465 views

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 ...
7
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1answer
88 views

Are there variations in blood cholesterol by age?

Is blood cholesterol supposed to be always the same level or there are variations according to the age?
7
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282 views

Can blood transfusion help in case of scleroderma?

Can blood transfer can somehow help a case of scleroderma? I know it's not the way to cure it, but I was just wondering if this can slow down the body destruction made by the faulty lymphocytes. ...
7
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1answer
242 views

How to deal with pale fingers in cold weather?

What is this condition called when one or more fingers go pale every time when being in a cold environment? Is it something that can be handled without having to relocate to exotic countries?
7
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1answer
74 views

How does Psoriasis change the biochemistry of blood?

I read somewhere that Psoriasis can increase the amount of uric acid in the bloodstream by about 10%, increasing the chance of gout:psoriasis Is this the only biochemical change in the bloodstream ...
6
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1answer
110 views

Why are people with certain blood types more/less susceptible to norovirus?

Infection with some types of norovirus appear to be rarer in people with some blood types than in others, see Norwalk Virus Infection and Disease Is Associated with ABO Histo-Blood Group Type, from ...
6
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1answer
70 views

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 ...
6
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1answer
3k views

What are the implications of having weak A or B blood?

I have a child with weak B blood. I figured out that this means that the B antigen is only weakly expressed: http://www.ncbi.nlm.nih.gov/books/NBK2267/ So I understand what this is, but my confusion ...
6
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1answer
1k views

Why do people get nosebleeds from overexerting themselves or when they're sick?

In many TV shows from medically-related to not, people get nosebleeds when they're working too hard or "deathly" ill. I'm wondering if this real or just dramatized. If it happens to be real, is it ...
6
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2answers
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 ...
6
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1answer
81 views

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 ...
5
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2answers
67 views

Occasional medical tests and imageries

I ouce asked on Quora, why people do not do yearly blood tests and imaging, to prevent getting stage 4 cancers. The answers listed reasons not to do this: It would cost a lot of money (for the ...
5
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1answer
98 views

Normal for menstruation blood to be brown/black at the start?

Lately, in addition to the more intense abdominal pain than usual, my period is manifesting itself in dark brown/black (tarry-like) blood from the start and staying like that for almost 5 days until ...
5
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1answer
3k views

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 ...
5
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1answer
195 views

What do these blood tests mean in general and why do doctors ask for them before taking action?

My doctor ordered some blood tests for me. I would like to understand what each test is for, meaning what information could be gathered from the results. W.B.C. Platelets E.S.R. C.R.P. Alpha feto ...
5
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1answer
175 views

Is it possible to get a cut from being elbowed in the head?

So I was at a basketball game, and sometime mid-way through it, I got elbowed in the head. At the end of the game, I found that I got a small cut that was slightly bleeding and, at that point, the ...
5
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1answer
426 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 ...
5
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1answer
224 views

What keeps our organs in place?

Do they float iniside our "blood blob inside our body" or they are connected to our muscles ?
5
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3answers
95 views

Blood in urine without seeing it...?

I came from my doctor and he did a urine sample and said there was blood in my urine. I've never seen "blood" in my urine or had any issues with my kidneys so I was perplexed by this. Is this ...
5
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2answers
262 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-...
5
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1answer
1k views

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 ...
5
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1answer
365 views

ABO blood type mismatch

I have a question about blood types and seeming hereditary contradictions. The above image of an Eldoncard blood test, which shows quite clearly that the testee has AB- type blood. (see image!). The ...
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0answers
101 views

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 ?
4
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1answer
136 views

What happens when a hemophiliac woman gets her period?

If there was a woman who is also a hemophiliac/bleeder, what happens when she gets her period? Does her condition affect said period in any way, and if so, how? Would it be troublesome (more than ...
4
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1answer
79 views

What are the online blood testing services that allow to pick and choose exactly what test you want?

I know there are now several competitive online blood test companies that offer a menu of bundled blood test services in the US. I am looking for a US based service that would disaggregate their ...
4
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2answers
128 views

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 ...
4
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1answer
134 views

Blood donor restrictions (Mad Cow Disease) in Australia/France for people who lived in Britain, is it justified?

I have found out recently that in Australia and France you are not allowed to give blood if you spent more than one year in the UK between 1980 and 1996 because of mad cow disease. I am wondering why?...
4
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2answers
111 views

Third degree burns Home Treatment

(This is for a post-apocalyptic novel, just so we're clear. I'm not treating anybody.) In the case of a calf-long burn, second to third degree, how can you treat it by yourself, if there is nobody to ...
4
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1answer
186 views

How can mercury be removed from the body "naturally"?

Is it possible to remove mercury from the (live) human body without undergoing chelation therapy? Does the body remove it naturally? He switched to salmon and his mercury levels fell by half -- ...
4
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1answer
14k views

What has hot shower to do with low blood pressure?

http://www.webmd.com/heart/understanding-low-blood-pressure-treatment What Are the Treatments for Low Blood Pressure? ... Avoid prolonged exposure to hot water, such as hot showers and spas. ...
4
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1answer
99 views

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, ...
4
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1answer
655 views

"Blood rushing to the head" during handstands: How is it regulated?

Many people who start practicing handstands or headstands report discomfort in their head, ranging from a mild sense of fullness to "my head is going to explode." The standard response in online ...
4
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1answer
11k views

What are the effects of swallowing own blood from nosebleeds?

I've seen people on the internet claim that you shouldn't tilt back your head during nosebleeds, because blood could get into your lungs or stomach. When I asked people I know what they do during ...
4
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2answers
1k views

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?
4
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1answer
102 views

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 ...
4
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1answer
44 views

Who decides the "normal" values for blood count?

I'm currently researching the values for a Complete Blood Count. Obviously different sources give slightly different values, usually due to rounding, but I found that some values consistently shifted ...
4
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1answer
296 views

Can someone be both prediabetic and hypoglycemic?

Hypoclycemia seems to have several distinct causes, depending on whether you are diabetic or not. If you are diabetic, you can apparently become hypoglycemic if you're taking too much insulin. If you'...
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0answers
304 views

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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0answers
628 views

Mechanism of retrograde propagation of arterial thrombi

Quoting from _Robbins Basic Pathology 9th ed. Thrombi are focally attached to the underlying vascular surface and tend to propagate toward the heart; thus, arterial thrombi grow in a ...