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A person who performs a phlebotomy is called a phlebotomist, although most doctors, nurses, and other technicians can also carry out a phlebotomy. [2] In contrast, phlebectomy is the removal of a vein. Phlebotomies that are carried out in the treatment of some blood disorders are known as therapeutic phlebotomies. [3]
The original test proposed by Allen is performed as follows: [1] The patient is asked to clench both fists tightly for 1 minute at the same time. Pressure is applied over the radial and ulnar arteries simultaneously so as to occlude them. The patient then opens the fingers of both hands rapidly, and the examiner compares the colour of both.
Fresh frozen plasma is made up of a complex mixture of water, proteins, carbohydrates, fats, and vitamins. [1] When frozen it lasts about a year. [1] Plasma first came into medical use during the Second World War. [1] It is on the World Health Organization's List of Essential Medicines. [7] In the United Kingdom it costs about £30 per unit. [8]
A 1 mmHg change in PaCO 2 above or below 40 mmHg results in 0.008 unit change in pH in the opposite direction. [11] The PaCO 2 will decrease by about 1 mmHg for every 1 mEq/L reduction in [HCO − 3] below 24 mEq/L; A change in [HCO − 3] of 10 mEq/L will result in a change in pH of approximately 0.15 pH units in the same direction.
This happens more quickly with smaller volumes of blood such as a pinprick and less quickly from cuts or punctures that cause greater blood flows such as a puncture in the basilic vein: all blood collected during a phlebotomy procedure is deoxygenated blood, and it does not usually have a chance to become oxygenated upon leaving the body.
The rapid plasma reagin test (RPR test or RPR titer) is a type of rapid diagnostic test that looks for non-specific antibodies in the blood of the patient that may indicate an infection by syphilis or related non-venereal treponematoses.