History of Medical Technology Profession in a Global and Local View

Early Medical Diagnosis and the Four Humors in Ancient Medicine

In the early stages of medical history, diagnosis was characterized by treating diseases as a profound mystery. It was widely believed that illness resulted from a negative interaction between human beings and their environment. Around $300\,B.C.$, the figures Hippocrates and Galen instigated a paradigm shift toward basic qualitative assessment of bodily disorders. They utilized measurements of body fluids, known as the four humors, and observed their relation to the seasons to improve the quality of life for their patients. These four humors were linked to four distinct elements: Blood (Air), Phlegm (Water), Black Bile (Earth), and Yellow Bile (Fire). Each humor was associated with specific organs and behavioral traits. Blood was believe to be produced by the liver, and patients with blood-related issues were thought to exhibit hopefulness, playfulness, or religious characteristics. Phlegm, sourced from the brain and lungs, was linked to apathetic behavior. Black Bile was believed to originate in the gallbladder and was cited as a cause of depression. Yellow Bile, produced by the spleen, was associated with aggressiveness and excessive anger.

Uroscopy and Early Diagnostic Indicators

Urine was one of the primary body fluids subjected to examination in early medicine. Hippocrates advocated for multiple diagnostic methods, including the tasting of urine, listening to the lungs, and observing the physical appearance of the patient. He noted that the presence of bubbles, blood, and pus in the urine served as a clinical indicator for kidney disease and other chronic conditions. Additionally, ant testing was utilized as a diagnostic tool. Galen famously described diabetes as "Diarrhea of urine" and established a clinical relationship between the volume of fluid intake and the volume of urine excreted. During the medieval period in Europe, diagnostic procedures known as "Water Casting" (Uroscopy) became widely practiced. Patients would submit urine specimens in decorative flasks. This practice was so formalized that physicians who failed to examine the urine were sometimes subjected to public beatings. By $900\,AD$, a specialized book was developed containing the characteristics of urine, used specifically to assess samples based on Color, Density, and Quality. From these foundations, medical technology advanced rapidly, spurred by high mortality rates from plagues and other infectious diseases.

Transition From Symptom Description to Mechanical Diagnosis

During the $11th\,Century$, medical practitioners were strictly prohibited from conducting physical examinations of the patient's body. Consequently, they relied almost entirely on the patient's subjective description of symptoms and outer observations. By the $18th\,Century$, the medical field integrated mechanical techniques and cadaver dissection to provide more objective and accurate diagnoses, aiming to understand the internal workings of the body. The $19th\,Century$ marked a significant evolution as physicians began using machines for both diagnosis and therapeutics. Key inventions during this time included the Spirometer, invented by John Hutchinson to assess lung function by measuring inhaled and exhaled air, and the Sphygmomanometer, invented by Jules Herrison to measure blood pressure. This onset of mechanical and chemical devices caused a pivot from general practice toward specialization, as the increasing volume of medical knowledge became too vast for generalists to manage.

The Rise of Medical Technology and Information Systems

The implementation of complex machinery required technical expertise, leading to cooperative arrangements among specialists across various fields. Medical services eventually became organized within hospital settings, where large volumes of patient data were required for diagnosis and treatment. This influx of data prompted the need for information technology to manage the high volume of information. By $1969$, statistics showed that $80\%$ of total medical professionals were non-physicians, focusing on the use of technology for diagnostic assessments. Over time, technology began to supersede face-to-face interactions, as physicians relied more on technological assessment than on the subjective descriptions provided by patients. While this improved diagnostic accuracy, it occurred at the expense of a closer doctor-patient relationship. Breakthroughs like the thermometer, stethoscope, microscope, ophthalmoscope, laryngoscope, and x-ray eventually allowed physicians to examine living internal body parts that were previously only observable in cadavers.

Historical Timeline of Medical Technology Development

In $1816$, Rene Laennec invented the Stethoscope, which was the first major diagnostic medical breakthrough used to acquire information regarding lungs and heartbeats. This was followed in $1840$ by the development of the Microscope for medical purposes, with the first practical version devised by Antonie Van Leeuwenhoek. In $1850$, Hermann von Helmholz invented the Ophthalmoscope as the first visual technology for the eyes. In $1855$, Manuel Garcia devised the Laryngoscope using two mirrors to observe the throat and larynx. A major turning point occurred in $1859$ (noted as the discovery by Willhelm Roentgen) when it was found that radiation could penetrate solid objects of low density. This allowed for visualization of the internal body without surgery and became essential for diagnosing pneumonia, pleurisy, and tuberculosis since World War 2. In $1903$, William Enthoven developed the Electrocardiograph to measure electrical changes during heartbeats.

Advancements in Physical Therapy and Cardiology

In $1910$, Elizabeth Kenny devised the Kenny Method for treating polio, then known as infantile paralysis. This pioneering work for modern physical therapy used hot packs and muscle manipulation, and led to the $1927$ invention of the Sylvia stretcher for transporting patients in shock. In $1927$, Philip Drinker invented the Drinker Respirator to assist patients with paralytic anterior poliomyelitis in recovering normal respiration. In $1939$, the Heart-Lung Machine was noted as another visual technology breakthrough (associated in transcript with Hermann von Helmholz). By $1941$, Cardiac Catheterization and Angiography were established as safe methods for human use by Cournand, following initial operations by Forsmann in $1929$ and development by Moniz, Reboul, and Rousthoi between $1930$ and $1940$. This technique involved inserting a cannula through an arm vein into the heart with an injection of radiopaque dye for X-ray visualization of vessels and valves.

Modern Scientific Integration and Lab Innovations

Further integration of science and technology ushered in modern advancements such as the Electron Microscope, which allowed for the visualization of small cells including tumor cells. The use of computers led to the development of Tomography and Magnetic Resonance Imaging (MRI). Ongoing breakthroughs continue through robotics, keyhole surgery, genetic engineering, and telemedicine. Specific historical milestones in the clinical laboratory include Antonie Van Leeuwenhoek (Father of Microbiology) in $1660$; Edward Jenner's $1796$ smallpox vaccine (Immunology); Marie Francois Xavier Bichat's $1880$ identification of organs by tissue types (Histology); Agostino Bassi's $1835$ work with worm disease (Bacteriology); Luis Pasteur's $1857$ rabies immunity; Gregor Mendel's $1866$ laws of inheritance; Joseph Lister's $1870$ demonstration of airborne surgical infections; Robert Koch's $1877$ pictures of anthrax and tubercle bacilli; and Elie Metchnikoff's $1886$ description of phagocytes.

Twentieth Century Laboratory Milestones

In $1886$, Erns Von Bergmann introduced steam sterilization in surgery. Karl Landsteiner distinguished blood groups and developed the ABO system in $1902$, while August Von Wasserman developed immunologic tests for syphilis in $1906$. Also in $1906$, Howard Ricketts discovered rickettsiae, microorganisms between bacteria and viruses. Hans Fischer worked out the hemoglobin structure in $1929$. In $1954$, Jonas Salk developed the Poliomyelitis vaccine. Quality control was revolutionized in $1973$ when James Westgard introduced the Westgard rules. Baruch Samuel Blumberg introduced the Hepatitis B vaccine in $1980$, and Kary Mullis developed the Polymerase Chain Reaction ($PCR$) in $1985$. In $1992$, Andre van Steirteghem introduced intracytoplasmic sperm injection ($IVF$), and by $1998$, the first human Stem Cell Line was derived.

History of Medical Technology in the United States

The service role of clinical laboratories was highlighted in $1895$ with the opening of the William Pepper Laboratory of Clinical Medicine at the University of Pennsylvania. In $1918$, John Kolmer called for national certification of medical technologists and published descriptions for the first formal training courses. That same year, state institutions were required to have fully equipped laboratories for routine testing with full-time technicians. By $1920$, labs were directed by a chief physician and typically consisted of four to five divisions: pathology, bacteriology, microbiology, serology, and radiology. The American Society for Clinical Pathologist ($ASCP$) was founded in $1922$ to foster cooperation between physicians and pathologists. The $ASCP$ established a code of ethics requiring technologists to work under physician supervision and refrain from making independent diagnoses. Later, the American Society for Clinical Laboratory Science was formed as an autonomous professional group, and by the $1950s$, technologists sought formal government recognition through licensure laws.

History of Medical Technology in the Philippines: Spanish Period

Medical structures in the Philippines began during the Spanish era with the establishment of Hospital Real in $1565$ in Cebu. Other early hospitals included San Lazaro Hospital ($1578$) for the poor and lepers, Hospital de San Juan de Dios ($1596$) for poor Spaniards, and Hospital de San Jose ($1641$) in Cavite. The University of Santo Tomas ($UST$), founded in $1611$, established its first faculties of pharmacy and medicine in $1871$. The Spanish authorities established the Laboratorio Municipal de Manila in $1887$ for examining food, water, and clinical samples. General Antonio Luna served there as a chemical expert and pioneered water testing, forensics, and environmental studies. However, many medical advancements broke down during the Philippine-American War ($1899$-$1902$).

The American Period and Post-War Development in the Philippines

Following the Spanish rule, the American government established public health institutions modeled after military systems. The Spanish Military Hospital was converted into the First Reserve Hospital in $1898$ by Lt. Col. Henry Lipincott. Richard P. Strong later utilized the lab for autopsies and testing blood, feces, and urine. In $1901$, the Bureau of Government Laboratories was established under Philippine Commission Act No. $156$, featuring a science library and laboratories for vaccine production and the study of human and animal diseases. Paul Ferrer served as the first director. In $1905$, it was reorganized into the Bureau of Science, which worked with the Philippine General Hospital and the University of the Philippines. In $1927$, the UP College of Public Health opened its Certificate in Public Health. During World War 2, the US Army's $3rd$, $5th$, $8th$, and $19th$ medical general laboratories were deployed in the West Pacific. The first clinical laboratory was established by the $6th$ Infantry Division of the US Army at Quiricada St., Sta. Cruz, Manila, now the Manila Public Health Laboratory.

Formalization of Medical Technology Education in the Philippines

In June $1945$, the US Army endorsed the laboratory to the National Department of Health. It was reopened in October $1945$ by Dr. Pio de Roda and Dr. Mariano Icasiano. Dr. Pio de Roda and Dr. Prudencia Sta. Ana conducted training for laboratory workers, with Sta. Ana preparing a six-month formal syllabus. In $1954$, the Bureau of Private Education approved a four-year Bachelor of Science in Medical Technology. The Manila Sanitarium and Hospital ($MSH$), led by Mrs. Willa Hedrick, opened the first school, eventually affiliating with Loma Linda University. The Philippine Union College ($PUC$) later absorbed this school. Dr. Jesse Umali was the first graduate of the MedTech program. $UST$ offered the course as an elective in $1957$ and recognized it as an official program in $1961$.

The Nature and Practice of Medical Technology ($R.A.\,5527$)

Medical technology is defined as a contextual, interdisciplinary, interdependent, and system-based science. In the Philippines, the profession is governed by $R.A.\,5527$, the Medical Technology Act of $1969$. Section $2$ of this act defines the practice as rendering professional services for a fee or salary to aid physicians in diagnosis, study, treatment, and health promotion. The scope includes the examination of tissues and body fluids via chemical, microscopic, bacteriologic, and other laboratory procedures. It also covers blood banking, parasitologic, mycologic, histopathologic, and cytotechnology techniques ($provided that registered technicians can perform histopathologic techniques$). Furthermore, it includes clinical research, reagent standardization, quality control, and specimen collection. Practitioners must be licensed, and practicing without a license is punishable by law. Professional conduct is guided by a code of ethics and a solemn pledge of oath.

Roles and Responsibilities of Medical Technology Professionals

Medical technologists are responsible for performing clinical laboratory training, ranging from routine tests like urinalysis and stool examination to advanced hematologic and chemical procedures. They must perform special procedures, including the operation of advanced diagnostic equipment like molecular and nuclear diagnostics. A core responsibility is ensuring the accuracy and precision of results, as these directly impact physician interpretation and patient medication. Honesty in practice, particularly in reporting results, is paramount. They must ensure timely delivery of results, being alert to "STAT" requests from the $ER$ or $OR$. Professionals must demonstrate professionalism, uphold patient confidentiality, and collaborate with other healthcare providers. They are also expected to conduct research to discover new knowledge and involve themselves in health promotion programs, such as community sanitation campaigns and offering free laboratory testing.

Specialized Laboratory Personnel and Their Functions

Several specific roles exist within the laboratory ecosystem. A Pathologist is a registered physician trained in laboratory medicine who interprets tissues and secretions to diagnose disease and ascertain the cause of death; they must head the clinical laboratory and sign results for them to be valid. Medical Laboratory Technicians assist technologists and pathologists; they may qualify if they achieve a $70\%$ rating on the licensure exam or have specific years of experience and college credits. Phlebotomists are trained to draw blood via skin puncture, venipuncture, or (if specifically trained) arterial puncture. Cytotechnologists work with pathologists to detect cell abnormalities, often using Pap tests and $H\&E$ staining. Histotechnologists (or histotechnicians) prepare and stain biopsies for microscopic examination using microtomes. Nuclear Medical Technologists apply radiation physics to administer radiopharmaceuticals and measure radionucleotides. Finally, Toxicologists study the effects of toxins on living organisms to assist in consumer protection and industrial safety.

Questions & Discussion

One important note regarding the speed of laboratory service is the concept of $TAT$, or Turn Around Time. This refers to the duration between the request for a test and the delivery of the final result. Regarding the privacy of clinical data, it is established that only the attending physicians and the involved medical staff directly responsible for patient care are permitted to know or access patient information. A specific clinical distinction made in the profession is that blood typing can be performed without needing to crossmatch, whereas crossmatching cannot be performed without first performing blood typing.