15

The World Health Organization published a report entitled Blood Donor Selection: Guidelines on Assessing Donor Suitability for Blood Donation. Based on a review of scientific studies and other literature, it contains detailed recommendations for establishing blood donation programs, including which donors to accept or reject. It mentions several autoimmune ...


12

I think your skepticism may come from not understanding the process behind the claim. A single unit of blood is separated into 4 main "blood products": red blood cells, plasma, platelets, and white blood cells. Another product called cryoprecipitate can be produced from frozen then thawed plasma and is used in special circumstances. Whole blood is rarely ...


10

In premenopausal women, the risk of developing atherosclerosis is half that of men. In 1991, Sullivan proposed the iron hypothesis which attributed this decreased risk to premenopausal women's lower blood iron levels, and suggested that blood donation may reduce the risk of developing atherosclerosis. The validity of the hypothesis is still an open ...


8

The only known significant long-term risk of blood donation is iron deficiency. Immunity (which you asked about) is primarily mediated by white blood cells, which can be easily deployed from the lymphatic system and bone marrow to replace those lost in donation. Red blood cells, on other hand, are not stored as mature cells in large numbers outside of the ...


5

Most blood donors are a bit weakened from giving blood, despite feeling often great. The amount of blood removed from circulation reduces your possible performance level and you might tire more easily as the reduced volume of blood also means a reduction in oxygene availability. This small measurable level of performance reduction can reach up to three ...


5

I presume she is at risk for developing bowel malignancy at some time in the future. So, unless she is screened very regularly, then if she is accepted as a blood donor, she might be donating blood while she is in a cancerous state. Now, is there evidence of the ability to transfer cancer from one person to another via blood transfusion? This has been ...


5

I don't know if anyone can give a definite answer as to why these folks so badly wanted you to donate platelets over whole blood, but there are many possible reasons. Platelets give you more bang for your buck. According to the American Red Cross, one session of platelet apheresis can collect enough platelets for one or two transfusions. On the other hand, ...


5

Gauge sizes do affect the red blood cells (RBCs). However, this mostly applies in the high range with 23 gauge needles (and higher) predisposing the sample to hemolysis (the destruction of RBCs) which causes problems for some blood tests (namely the CBC). Large needles come with problems of their own like an increased risk of creating a tear in the blood ...


5

I'm not aware of any work done in this area. A whole blood transfusion is not going replace circulating defective lymphocytes. On the other hand Hematopoietic Stem Cell Transplantation has some promise in patients with deteriorating lung function. Autologous HSCT could “reset” the host immune system to a point in time when the antigenic triggers of ...


4

The article The importance of weak ABO subgroups has a section on this, in addition to general information on what weak subgroups are. All quotes in this answer areas from that study. Weak blood types Weak blood types can be caused by a person having a mutation that leads to not expressing the type A or B antibodies as much, or by mutations in the genes ...


4

I'm answering my own question, yay! This is my attempt to answer my question despite my lack of familiarity with much of the medicine. I therefore stress that I am not guaranteeing this answer, it's meant to be a very rough estimate and shouldn't be considered exact. Perhaps others will comment on things I missed and allow me to make it better... First, ...


4

Blood donor restrictiction aims at preventing the transmission of the variant Creutzfeldt-Jakob disease (also known as Mad Cow Disease for a layperson), which is a prion disease that leads to irreversible neurodegeneration. Affected patients present with neurological and psychiatric symptoms and eventually die. Here some historical background to understand ...


4

If a child has blood type O, it means both his alleles are recessive (since A and B are dominant over O); one of them he gets from their mother, and the other one from their father. That means that the father must have at least one recessive allele that he transfers to the offspring; so the possibilities of the father's genotype are OO, AO or BO. As for the ...


3

This "rumor" is initially mostly based on a humor. According to humorism your four juices might be out of balance or gone bad and that might prescribe a course of the ancient practice of bloodletting to restore that balance, giving you a cure for almost anything. Since modern medicine largely abandoned humorism as a theoretical framework this line of ...


3

Here are some statistics: Each year, an estimated 6.8 million people in the U.S. donate blood. 13.6 million whole blood and red blood cells are collected in the U.S. in a year. Giving blood saves 4.5 million lives each year in the U.S. The Jehovah's Witness patients' decision to forego transfusions for major surgical procedures appears to add 0.5% to 1.5% ...


2

Short: before the knowledge of blood typing transfusions were attempted and near all failed. Long: There were many attempted transfusions that were mostly fatal. The first attempted (recorded) transfusions were practise by the Incas. Since 1616 when circulation was first detailed practitioners have been attempting to transfusion substances. These include ...


2

Larger needles aren't used to draw blood faster in general. They are used to avoid hemolysis. 16-18 gauge needles: A large needle (16 to 17 gauge) is used to minimize shearing forces that may physically damage red blood cells as they flow through the needle What maybe used to speed up the process is: Sqeezing your fists Tourniquets or blood ...


2

Blood pressure is not significantly affected in the short term. The body has all sorts of homeostatic mechanisms to maintain blood pressure, such as increasing heart rate and constricting blood vessels. However, if these mechanisms are not functioning well (or if someone already has low blood pressure), then it might well reduce. Interestingly, your ...


2

Normally whole blood is not used for transfusion purposes. Instead it is separated into components which are then transfused after first being aggregated. If someone needs a blood transfusion, then normally they are given packed red cells without platelets and without plasma. The transfusion times are: The infusion rate for blood products depends on the ...


2

You might as well ignore the calories of food given to you in such a situation: Burns Calories: People burn approximately 650 calories per donation of one pint of blood, according to the University of California, San Diego. A donor who regularly donates blood can lose a significant amount of weight, but it should not be thought of as a weight loss plan ...


1

According to the standard blood compatibility chart: (image from Owlcation: The Basics of Blood and Blood Typing - Wikipedia file) AB blood types can only donate to other AB blood types, but AB blood types can receive from other blood types, so what is the point of being an AB donor. Well, the chart says that they are the only blood type that can do a ...


1

WebMD seems to suggest no: "Atopic eczema (disorder causing skin itching) Vitamin E has been applied to the skin to prevent scars. However, because of a risk of allergic skin reaction, some researchers have advised against the use of this therapy. Further studies are needed." And "Scar prevention Vitamin E applied to the skin does not appear to reduce ...


1

There are no stupid ideas, this is a very good question. Unfortunately the answer is you can't do this - what determines the blood type is the presence of antigens on the surface of red blood cells. Simply put, antigens can trigger certain responses from the immune system. Here are the four types: Type A: Only the A antigen on red cells (B antibody in the ...


1

Be sure to supplement enough iron (about 18 mg per day)! Take your iron with vitamin C and avoid tea and coffee. American Red Cross: "The American Red Cross now recommends that individuals who give blood frequently should take a multivitamin with iron or an iron-only supplement to replace the iron lost through blood donation. Before taking a multivitamin ...


1

The first recorded blood transfusion was done on dogs in 1665. Two years later, blood was successfully transferred from a sheep to a human. In 1818, James Blundell, an obstetrician, successfully treated a patient with postpartum hemorrhage with her husband's blood. The main problem that stood in the way of the development of blood transfusion was the ...


1

First, it'll be necessary to know if only the mother was infected during pregnancy, or if the parasite responsible for toxoplasmosis (Toxoplasma gondii) was really transmitted to the foetus. This was possibly done during pregnancy via amniocentesis. If the person was infected in utero, then they are likely to carry the parasite, although they won't ...


1

People who have had toxoplasmosis are not barred from donating blood (at least in the places I checked). While toxoplasmosis during pregnancy is dangerous for the embryo/fetus, if they don't have lasting damage from it, that person is just like any other person who once had toxoplasmosis, of which there are many (in some countries up to 80 percent of people ...


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