The Evolution of Phlebotomy

The Evolution of Phlebotomy

The presentation traces phlebotomy from ancient bloodletting practices to modern blood collection for diagnosis. Its central lesson is that progress has involved not only better equipment, but also stronger safety practices, training, standards, and professional responsibilities.

1. Early bloodletting and its rationale

• The earliest documented bloodletting described in the presentation dates to around 1550 B.C. in ancient Egypt. Practitioners used small cuts, or scarification, based on the mistaken belief that hippos relieved discomfort by bleeding. The practice was recorded in the Ebers Papyrus.
• From roughly 300–400 B.C., Hippocrates’ theory of the four humors—blood, phlegm, yellow bile, and black bile—shaped medical treatment. Illness was understood as an imbalance, which could be addressed through methods such as inducing vomiting, using diuretics, or removing blood.
• Galen also supported humoral theory and considered blood especially important. He believed blood could accumulate and become stagnant, so he advocated purging it, including when a person was not ill. He reportedly created guidance for how much blood to remove based on factors such as age, weather, weight, location, and symptoms.
• During the Middle Ages, bloodletting became more widespread. Its timing could be influenced by religious beliefs, holy days, phases of the moon, or planetary alignments.
• In the 19th century, physicians might recommend bloodletting, while barbers performed it alongside procedures such as wound care, tooth extraction, and enemas. The traditional red-and-white barber pole was associated with blood and bandages.
• Blood-removal methods included:
  • Leeches: Widely used in 19th-century Europe. Leeches are still used for certain medical purposes, but not to collect blood for testing.
  • Cupping: Cups were used to draw blood toward the skin; some practices involved cutting the skin. Cupping without cutting is still used today.
  • Scarification: Superficial cuts or lancets were used to produce bleeding.
  • Venesection: A vein was opened, often the median cubital vein.
  • Arteriotomy: An artery was punctured; historically, the temple artery was commonly used.
• Bloodletting was prescribed for a wide range of conditions despite limited evidence of benefit and serious risks. The presenter cited George Washington’s death after repeated bloodletting during a severe throat infection as a commonly discussed example.
• Bloodletting gradually fell out of favor during the 20th century. A modern, controlled practice called therapeutic phlebotomy is still used for certain conditions, including polycythemia.

2. How blood collection technology changed

• Syringes were initially used to inject substances, not to collect blood. The presentation described early syringe-like devices and later medical injections before discussing the eventual use of glass syringes for blood collection.
• Early blood collection involved drawing blood into a glass syringe, manually transferring it into glass tubes, adding any required anticoagulant, and sealing the tubes. Syringes, tubes, and needles were reused after cleaning; dull needles could be resharpened.
• This approach was slow and created substantial risks, including blood splashes, spills, exposed blood-filled needles, and needle-stick injuries.
• Vacuum blood collection systems improved speed, convenience, and safety. A double-ended needle connects the patient’s vein to an evacuated tube, which draws in the intended amount of blood.
• Butterfly collection sets provided another option, allowing a collection set to be used with an evacuated tube adapter or a syringe. This gives phlebotomists more flexibility to choose a device appropriate for the patient and vein.
• The presenter described these milestones in vacuum-tube development:
  • Joseph Kleiner invented a glass vacuum tube in 1947.
  • Plastic vacuum tubes were introduced later, reducing the risk of broken glass and spilled blood.
  • Tube colors came to indicate the additive, or lack of additive, inside. This helps standardize collection across manufacturers.
• Other safety improvements include needle shields and retractable devices, safety lancets, tube caps designed to reduce splatter, and puncture-resistant sharps containers.

3. Safety and regulation

The presentation emphasized that regulations and institutional procedures help protect both patients and healthcare workers, reduce shortcuts, and support reliable specimens.

• The Medical Device Amendments of 1976 established safety and effectiveness safeguards for medical devices and authorized the FDA to ban devices considered too hazardous. The presenter linked the law to concerns about injuries and deaths caused by faulty devices.
• In the early 1980s, sharps containers became available to reduce exposure risks for phlebotomists and others handling medical waste.
• Employers became responsible for providing adequate personal protective equipment (PPE), such as gloves, eyewear, masks, and lab coats. The presenter noted that adapting to gloves was initially difficult for some phlebotomists, but modern training incorporates glove use from the beginning.
• Point-of-care testing can reduce the need for repeated venipunctures for some tests. The example given was glucose monitoring: a finger-stick test can provide results quickly and support treatment decisions in real time.
• The World Health Organization’s Injection Safety Program recommended that institutions:
  • Provide training to prevent mishaps and poor-quality specimens.
  • Use safety-engineered devices and sharps containers.
  • Track exposures and needle-stick incidents.
  • Provide support after an exposure and clearly post instructions for what employees should do.
  • Supply appropriate single-use PPE free of charge and in sufficient quantities.
• The Clinical Laboratory Standards Institute (CLSI) publishes guidelines for safe, consistent laboratory practices. Examples named in the presentation include:
  • GP41: Collection of diagnostic venous blood specimens.
  • GP48: Essential elements of a phlebotomy training program.
• NAACLS began approving phlebotomy programs in 1986. The presenter said that in 2023, it was moving from an approval process to accreditation.
• OSHA’s Bloodborne Pathogens Standard (1910.1030) covers topics including exposure-control plans, work practices, engineering controls, PPE, regulated waste, housekeeping, employee training, recordkeeping, and communication of hazards.
• Institutions use standard operating procedures (SOPs) to document how their specific procedures must be performed. SOPs should be accessible, detailed, regularly updated, and used alongside—not in place of—initial employee training.
• The presenter also stressed reporting issues beyond needle sticks, such as patient-identification errors, poor specimen quality, and inappropriate treatment of staff.

4. Training, certification, and professional responsibilities

• The presenter stated that only Nevada, California, Washington, and Louisiana required phlebotomist certification at the time of the webinar. Some employers in other states may require it.
• Certification routes may require a high school diploma or equivalent, plus completion of an accredited program or qualifying work experience. The presenter named several credentialing organizations, including ASCP, NHA, American Medical Technologists, the National Phlebotomy Association, and American Allied Health.
• Training varies: some institutions train employees on the job, while programs may be accredited or unaccredited and differ in requirements for clinical hours and successful venipunctures. Even certified phlebotomists need site-specific training.
• Effective phlebotomists need to:
  • Be skilled in blood collection and work with varied patients and settings.
  • Keep current with changing procedures, tools, and best practices.
  • Communicate effectively with patients, families, coworkers, and healthcare teams.
  • Use critical thinking, follow procedures, address conflicts, and de-escalate tense situations.
  • Stay alert to safety risks and speak up when they see a problem.
  • Manage time and work collaboratively, particularly in busy or understaffed settings.
• The scope of practice can extend beyond blood draws. Depending on the institution, phlebotomists may assist with IVs or line collections, handle non-blood specimens, perform swabs, conduct sweat testing, or perform ECGs.

5. Future directions and conclusion

• The presenter raised questions about whether robots might eventually collect blood and whether point-of-care technology could allow more tests to be run from just a few drops. She did not predict what will happen, but suggested that phlebotomy may continue to evolve.
• Overall, the field has shifted from bloodletting for presumed treatment to carefully collecting small amounts of blood for diagnostic testing. The presenter concluded that blood will continue to have medical value and that ongoing improvements in safety, education, and technology will remain important.

6. Question-and-answer note

In response to a question about changes since COVID-19, Erin said that at Mayo Clinic in Rochester, a major change was the everyday use of masks as part of PPE, along with closer attention to isolation precautions.

Speakers and sources featured

Speakers

• Sierra Tollefson — Education specialist for Mayo Clinic Laboratories; introduced the webinar and handled closing announcements.
• Erin Peper — Program director of the Mayo Clinic School of Health Sciences Phlebotomy Technician Program; main presenter and responder during the Q&A.

Historical figures, documents, organizations, and standards mentioned

• The Ebers Papyrus
• Hippocrates and Galen
• The World Health Organization Injection Safety Program
• Clinical Laboratory Standards Institute (CLSI), including guidelines GP41 and GP48
• National Accrediting Agency for Clinical Laboratory Sciences (NAACLS)
• Occupational Safety and Health Administration (OSHA) and Bloodborne Pathogens Standard 1910.1030
• U.S. Food and Drug Administration (FDA)
• International Organization for Standardization (ISO)
• The Medical Device Amendments of 1976
• The Safe Medical Devices Act of 1990
• The 21st Century Cures Act of 2016
• Phlebotomy credentialing organizations named: ASCP, NHA, American Medical Technologists, National Phlebotomy Association, and American Allied Health