What is the chemical used to determine any presence of blood?
360597
luminol, why would you need it?
231773
From the colour of the blood? No.\n\nThe only way to determine your blood type is through serotyping. Antibodies are added to a blood sample, and blood type is determined by whether or not agglutination occurs.
1126242
The amount of some materials in the sample can be changed by chemical reactions, including those that occur inside cells.  The rate of many chemical reactions is decreased by lowering the temperature.\n\nFor example, blood for "blood gases" is placed on ice, and rushed to the lab.  There, it is injected, from the original syringe, into the testing machine.  One of the analytes is oxygen; the loss or gain of oxygen must be minimised.  Thus, the cells are chilled; WBC use oxygen.  The blood is not decanted from the syringe into a tube, for transport, as it may equilibrate with air.\n\nCooling also reduces changes in pH of the blood, which would otherwise result from metabolism, including that of the RBC.\n\nIn general, it slows the rate of change of the sample, so values from tests reflect what was going on in the patient, at the time it was taken.
525837
Gas chromatography and mass spectrometry are two scientific methods which, when combined, are vital tools in modern forensic chemistry. This technique is used to separate complex mixtures into their purest components. In forensics, it can be used to determine the level of alcohol in a blood sample or to identify different inks on forged or altered documents. Its most important application to toxicology is that it can accurately identify poisons and toxins.
799884
Bloodstain pattern analysis is used to determine the direction and (subjectively) the speed of a drop of blood at an incident scene.  Round drops are typically indicative of blood falling from above.  Blood drops that land at oblique angles will form a teardrop shape.  The "tail" end of the pattern points to the direction that the blood came from and the length of the tail is an indicator of speed (the longer the tail, the greater the speed).  Inferences about the incident can possibly drawn from there, but are usually corroborated with other physical evidence.\n\nLarger pools of blood can be used to determine the location of a body or the extent of bleeding or some other needed information.  Again, this is usually corroborated with other physical evidence and its usefullness is determined case by case.
15033
Experiments have been done in order to design dialysis machines.  Also experimentation has been performed on newly dead humans in order to know how much formaldehyde solution would be needed to embalm bodies of different sizes.  Results for this kind of information leads to the data at the reference below (the 4.4 to 5.0 liters answers).  If you are asking if it is possible to find out the exact volume of blood in a specific living person, I do not know if the technology is currently available.
37337
This can be done by a blood test.
223671
Very carefully... blood "dis -cray -shas".  Good luck!
246043
Thank you for your question. Plasma and serum are both fluid components of the blood. However, serum is only present in the blood subsequent to clotting, after an injury. In essence, serum is identical to plasma, but it does not contain the components necessary for the clotting reaction (such as fibrinogens). \n\nPlasma comprises approximately 55% (the other 45% is red blood cells) of the total blood volume, and contains salts and ions such as calcium, sodium, potassium, and bicarbonate. It also contains larger molecules such as amino acids, lipids (fats), vitamins, and hormones. Approximately 91-92% of blood plasma is water, 7-8% is protein, and 1-2% is other solutes, such as electrolytes and nutrients.
603636
Luminol.\n\nLuminol is a chemical that glows greenish-blue when it comes into contact with blood — even traces that are years old. To be exact, it reacts to hemoglobin, an oxygen-carrying protein in red-blood cells. Luminol is so sensitive, it can detect blood at 1 part per million. In other words, if there is one drop of blood within a container of 999,999 drops of water, luminol will glow.\n\n\nInvestigators typically use luminol at crime scenes where no blood is visible. They spray the chemical over a wide area in near-total darkness, so any reaction is obvious. Officers then photograph or videotape the result, using a flash technique that picks up the glow while making the area around it visible and identifiable on film, so the context of the crime scene isn't lost.\n\n\nBut does a glow mean there's blood present? Not necessarily. Luminol reacts to some metals, paints, cleaning products and plant matter. However, the chemical's reaction to each differs in intensity; metals, for example, cause an immediate glow that quickly fades, while blood glows longer. A specialist can tell the difference, and then perform more conclusive tests to determine whether the blood is human.\n\n\nLuminol also can point the way to further evidence or even to how events might have unfolded. For example, if luminol sprayed on a carpet produces a glow, officers might peel back the rug to reveal a floorboard soaked with blood. Or perhaps the glow discloses the direction in which a criminal walked or dragged a body, or whether the victim was shot from behind or above.\n\n\nSo, to anyone thinking that a carpet cleaner or a sponge and soap will erase evidence of their crime, take note. This is one stain that cannot be "shouted out."
26886
blood tests are the best (and easiest) ways to test for skin allegies.
202335
The reaction apears differently on the majority of strips.  Hemolyzed blood is suggestive of renal sources of blood, while non-hemolyzed suggests urinary tract bleeding.  Some say Nephrologic vs Urologic causes of blood in the urine.  the strip is really a screening tool though and either way blood shows up - a follow up evaluation is needed.
543591
in a way, i think this doc is right...blood without red blood cells, which is the majority of the formed elements in the blood contents, is plasma. what makes up blood plasma is water, electrolytes (salt), plasma protein. what makes up tears is water, salt, enzyme (a form of protein). so i think Dr. Karl makes sense in this way....but, besides RBCs, there are WBCs, and platelets in blood...so he had said...tears are blood without formed elements, he could have been more precise...
498200
http://gslc.genetics.utah.edu/units/basics/blood/types.cfm\n this explains both questions. at the bottom of the page there is a link to "what is a blood transfusion" it tells you how it works too.
321801
If there is any blood present yes.
936998
a) isotonic to the blood
82722
It is the estimation of sodium, potassium, chloride in your blood.