Medical laboratory scientists (also called clinical laboratory scientists or medical technologists) analyze blood, urine, tissue, and other body samples to help physicians diagnose diseases, monitor treatment effectiveness, and screen for health conditions. They perform the laboratory tests behind every diagnosis that depends on lab work: the blood count that reveals infection or anemia, the blood chemistry panel that detects kidney or liver disease, the microbiology culture that identifies the bacterium causing an infection and determines which antibiotics will kill it, the blood type and crossmatch that ensures safe transfusion, the tissue analysis that confirms cancer, and the genetic test that reveals a hereditary condition. Laboratory results influence approximately 70 percent of all clinical decisions made in healthcare, making medical laboratory scientists indispensable to the diagnostic process even though most patients never see them or know they exist.
Education Pathway
Bachelor’s Degree (4 years): The standard entry-level education is a bachelor’s degree in medical laboratory science (MLS), clinical laboratory science (CLS), or medical technology (MT) from a NAACLS-accredited program. These programs include coursework in chemistry, biology, microbiology, hematology, immunology, molecular diagnostics, clinical chemistry, blood banking (transfusion medicine), urinalysis, body fluids, laboratory management, and quality assurance, along with supervised clinical rotations (typically one year) in hospital and reference laboratories. Some students earn a bachelor’s degree in biology or chemistry and then complete a 1-year MLS certificate program (sometimes called a 3+1 program) that provides the clinical laboratory training needed for certification. Certification: After completing an accredited program, most graduates take the ASCP (American Society for Clinical Pathology) Board of Certification exam to earn the MLS(ASCP) credential. Certification is preferred or required by most employers and is required for state licensure in states that license laboratory professionals. Advanced Education: Master’s degrees and doctoral degrees in clinical laboratory science are available for laboratory professionals who want to advance into management, education, research, or specialized practice areas (molecular diagnostics, clinical chemistry, microbiology, blood banking). Specialist certifications from ASCP are available in multiple disciplines.
What Medical Laboratory Scientists Do
Hematology: Analyzing blood cells under the microscope and using automated analyzers. MLS professionals perform complete blood counts (CBCs), examine blood smears to identify abnormal cells (leukemia cells, sickle cells, parasites), perform coagulation tests (PT, aPTT, fibrinogen) that monitor clotting function, and identify blood disorders that affect patient care. Clinical Chemistry: Analyzing blood and body fluid samples for chemical components (glucose, electrolytes, liver enzymes, kidney function markers, cardiac biomarkers, hormones, drug levels) using automated chemistry analyzers. Chemistry results are among the most commonly ordered laboratory tests and drive treatment decisions for patients with diabetes, kidney disease, liver disease, heart attacks, and many other conditions.
Microbiology: Identifying infectious organisms (bacteria, fungi, viruses, parasites) from patient samples and testing their susceptibility to antimicrobial drugs. Microbiology work involves culturing organisms on specialized media, performing Gram stains, identifying organisms using biochemical and molecular methods, and reporting antimicrobial susceptibility results that guide physicians in selecting the most effective antibiotic for each infection. In an era of antibiotic resistance, the microbiology laboratory’s role in guiding appropriate antibiotic selection is critical for patient outcomes and public health. Blood Banking (Transfusion Medicine): Performing blood typing, antibody screening, and crossmatching to ensure compatibility between donor blood and the recipient before transfusion. Transfusion errors can be fatal, making blood banking one of the highest-stakes areas of laboratory practice. Molecular Diagnostics: Using DNA and RNA-based testing methods (PCR, sequencing, gene expression analysis) to diagnose genetic conditions, identify infectious agents, and guide personalized medicine. Molecular diagnostics is the fastest-growing area of laboratory medicine.
Salary and Job Outlook
The median annual salary for medical laboratory scientists is approximately $60,780 according to the Bureau of Labor Statistics (this figure includes both MLS and MLT positions; MLS-level positions typically start at $55,000 to $65,000 and reach $75,000 to $95,000 with experience and specialization). The profession is projected to grow 5 percent through 2032. However, the profession faces a significant and worsening workforce shortage: retirements are outpacing new graduates, and many laboratory positions remain unfilled for months. This shortage creates strong job security, hiring bonuses, and salary increases for qualified MLS professionals. Laboratory science is consistently ranked among the most recession-proof healthcare careers because laboratory testing is essential regardless of economic conditions.
Advantages and Challenges
Advantages: Critical contribution to patient care (70 percent of clinical decisions depend on lab results), strong job security during a workforce shortage, the intellectual challenge of diagnostic problem-solving, diverse subspecialty options, regular hours in many settings (day shift in outpatient labs), the satisfaction of knowing that your work directly affects diagnosis and treatment, and the possibility of advancement into management, education, or specialized technical roles.
Challenges: Relatively lower salary compared to other bachelor’s-level healthcare professions (nursing, radiologic technology in advanced modalities), the invisibility of the profession (most patients do not know who performs their lab work, and the public recognition is minimal), the physical demands (standing for long shifts, repetitive pipetting and instrument operation), exposure to infectious specimens and potentially hazardous chemicals, and shift work in hospital laboratories that operate 24 hours a day, 7 days a week.
Getting Started
Middle school: Explore biology and chemistry and develop interest in laboratory work. High school: Take biology, chemistry, and math, participate in science labs and experiments. Undergraduate: Enroll in a NAACLS-accredited MLS/CLS program or complete a bachelor’s in biology or chemistry followed by a 1-year clinical laboratory certificate program. Complete clinical rotations and pass the ASCP certification exam.
Point-of-Care Testing: While most laboratory testing occurs in centralized laboratories staffed by MLS professionals, an increasing volume of testing is performed at the point of care (POC), at the patient’s bedside, in physician offices, emergency departments, and other clinical locations. POC tests include blood glucose meters, rapid strep tests, rapid COVID-19 and flu tests, basic blood gas analyzers, and cardiac biomarker assays. MLS professionals play a critical role in POC testing even when they do not perform the tests themselves: they validate and maintain POC instruments, train non-laboratory staff who operate POC devices, perform quality control and quality assurance for POC testing programs, troubleshoot discordant results between POC and laboratory testing, and ensure that POC testing meets regulatory requirements (CLIA, CAP accreditation). The expansion of POC testing creates new roles for MLS professionals as POC coordinators and managers who oversee testing quality across entire healthcare organizations.
Molecular Diagnostics and Genomics: Molecular diagnostics is the fastest-growing and most technologically advanced area of the clinical laboratory. MLS professionals working in molecular labs perform polymerase chain reaction (PCR) testing for infectious diseases (the same technology behind COVID-19 testing), genetic sequencing for hereditary conditions, pharmacogenomic testing, circulating tumor DNA analysis for cancer monitoring (liquid biopsy), next-generation sequencing (NGS) for comprehensive genomic profiling, and microbiome analysis. The integration of molecular testing into routine clinical care is expanding rapidly, and MLS professionals with molecular diagnostics expertise are in very high demand. Some MLS professionals pursue specialized molecular biology certifications (MB(ASCP)) or graduate degrees in molecular biology to advance in this field.
The Workforce Shortage: The medical laboratory profession faces a critical workforce shortage that has been building for decades and was exacerbated by the COVID-19 pandemic. Retirements are outpacing new graduates (the average age of practicing MLS professionals is increasing), some university MLS programs have closed due to low enrollment and funding constraints, and the profession’s relative invisibility makes recruitment of new students challenging. This shortage creates significant opportunity for entering professionals: job security is essentially guaranteed, employers offer signing bonuses and tuition reimbursement, salary growth is accelerating, and career advancement opportunities are more accessible as experienced professionals retire from supervisory and management positions. If you are attracted to laboratory science, this is an excellent time to enter the field.
References
Bureau of Labor Statistics. “Clinical Laboratory Technologists and Technicians.” BLS, 2025. https://www.bls.gov/ooh/healthcare/clinical-laboratory-technologists-and-technicians.htm. Accessed March 2026.