Introduction to Medical Laboratory Science: Disciplines, Methods, and Clinical Applications

Comprehensive vocabulary flashcards covering the core disciplines of Medical Laboratory Science, including histopathology, cytology, hematology, blood transfusion science, medical microbiology, and clinical chemistry.

Medical Laboratory Science

A healthcare discipline concerned with the analysis of human patient specimens to support the prevention, diagnosis, monitoring, and treatment of disease.

Histopathology

The branch of medical science that studies diseased tissues under a microscope to identify structural and cellular changes associated with disease.

Rudolf Virchow

A German physician (1821–1902) recognized as the Father of Modern Pathology.

$10\%$ Neutral Buffered Formalin

The standard chemical fixative solution routinely used in histopathology laboratories to preserve surgical and biopsy tissue specimens.

Microtome

A precision laboratory instrument designed to cut paraffin-embedded tissue blocks into extremely thin sections for microscopic examination.

Hematoxylin and Eosin (H&E) Stain

The standard routine histological stain used for general examination of tissue morphology and cellular architecture.

Periodic Acid–Schiff (PAS) Stain

A special histological stain used to demonstrate carbohydrates, glycogen, and certain fungal organisms in tissue sections.

Ziehl–Neelsen Stain

A specialized staining method employed to identify acid-fast organisms, particularly mycobacteria.

Masson's Trichrome Stain

A differential histological stain used to distinguish collagen fibers from muscle and other soft tissue components.

Immunohistochemistry (IHC)

A diagnostic technique that utilizes labeled antibodies to detect and visualize specific antigens within tissue sections.

Cytology

The branch of medical science that investigates individual cells and small cell clusters to identify normal cellular structures and disease-related abnormalities without evaluating tissue architecture.

Robert Hooke

An English scientist (1635–1703) regarded as the Father of Cytology, who was the first to use a microscope to observe living things and coined the term 'cell' in 1665.

Fine-Needle Aspiration Cytology (FNAC)

A minimally invasive cytology collection procedure using a thin needle to extract cellular material from organs and masses such as the thyroid, breast, lymph nodes, and salivary glands.

Exfoliative Cytology

A cytology sampling approach that examines cells naturally shed or scraped from body surfaces, including cervical Pap smears, sputum, urine, and peritoneal or pleural fluids.

Hematology

The medical discipline dedicated to the study of blood, blood-forming tissues, and disorders affecting blood cells and coagulation pathways.

Plasma

The liquid component of blood that comprises approximately $55\%$ of total blood volume and contains water, proteins, electrolytes, nutrients, hormones, and metabolic wastes.

Hematopoiesis

The continuous physiological production and development of blood cells, taking place predominantly within the bone marrow of healthy adults.

Erythropoietin

A glycoprotein hormone produced primarily by the kidneys that stimulates the bone marrow to produce red blood cells.

Hematocrit (Hct)

A complete blood count parameter that measures the percentage or proportion of total blood volume occupied by erythrocytes.

Mean Corpuscular Volume (MCV)

A red blood cell index that quantifies the average volume and physical size of an individual erythrocyte.

Red Cell Distribution Width (RDW)

A laboratory parameter in a complete blood count that measures the degree of variation in red blood cell volume and size.

Peripheral Blood Film

A stained microscopic glass slide of blood examined to assess the size, shape, color, inclusions, and structural maturity of red cells, white cells, and platelets.

Schistocytes

Fragmented red blood cells visible on a peripheral blood smear, indicative of mechanical red cell destruction or microangiopathic hemolysis.

Primary Hemostasis

The initial phase of blood clotting wherein platelets adhere to exposed subendothelial collagen, undergo activation, and aggregate to form a temporary hemostatic plug.

Secondary Hemostasis

The coagulation cascade phase in which plasma clotting factors activate sequentially to generate thrombin, converting soluble fibrinogen into an insoluble fibrin mesh that stabilizes the platelet plug.

Prothrombin Time / International Normalized Ratio (PT/INR)

A coagulation assay that evaluates the extrinsic and common pathways of the coagulation cascade and is routinely used to monitor vitamin K antagonist therapy.

Activated Partial Thromboplastin Time (aPTT)

A coagulation test that assesses the integrity of the intrinsic and common clotting pathways, characteristically prolonged in factor VIII or factor IX deficiency (hemophilia).

Forward Grouping

A pre-transfusion serological testing method that detects the presence of A and/or B antigens on a patient's red blood cells using known reagent antisera.

Reverse Grouping

A blood banking procedure that identifies expected naturally occurring ABO antibodies in a patient's serum or plasma using known reagent red blood cells.

RhD Antigen

The primary, clinically significant red cell surface antigen within the Rh blood group system used to classify individuals as RhD-positive or RhD-negative.

Cryoprecipitate

A plasma-derived blood component concentrated in fibrinogen, indicated for patients exhibiting clinically significant hypofibrinogenemia.

Microbiology

The scientific study of microscopic living organisms too small to be seen with the unaided eye, including bacteria, viruses, fungi, protozoa, and algae.

Antoni van Leeuwenhoek

A Dutch pioneer (1632–1723) who was among the first individuals to observe and describe living microorganisms using handcrafted microscopes.

Ferdinand Julius Cohn

A German biologist (1828–1898) who established a classification system for bacteria dividing them into four groups based on shape: spherical, short rods, threads, and spirals.

Robert Koch

A German scientist (1843–1910) who demonstrated experimentally in 1876 that specific microorganisms are the causative agents of specific infectious diseases.

Bacteriology

The sub-discipline of microbiology focused on the study of bacteria and bacterial diseases, such as pneumonia, diphtheria, meningitis, typhoid, and cholera.

Mycology

The branch of microbiology that specializes in the study of fungi, including yeasts and molds.

Phycology

The branch of biological science and microbiology dedicated to the study of photosynthetic eukaryotic organisms, including algae and seaweeds.

Protozoology

The branch of microbiology that investigates single-celled eukaryotic protozoans, including parasites responsible for conditions such as malaria and amoebic dysentery.

Virology

The study of viruses, which are acellular, non-cellular parasitic particles that infect living host cells to reproduce.

Parasitology

The study of parasites, their hosts, and their biological relationships, encompassing parasitic protozoa, parasitic helminths (worms), and arthropod vectors of disease.

Clinical Chemistry

The laboratory discipline involving biochemical analysis of body fluids (such as whole blood, plasma, serum, urine, and CSF) to evaluate organ function and detect metabolic and systemic diseases.

Diagnostic Panel (Profile)

A standardized grouping of multiple biochemical laboratory tests ordered concurrently to evaluate the comprehensive function of a specific organ or condition (e.g., liver function tests, renal panels, lipid profiles).

Serology

The clinical laboratory branch focused on the detection, measurement, and identification of specific antigens or antibodies formed in response to foreign substances or infectious pathogens.

Toxicology

The specialized field of clinical analysis centered on identifying and quantifying poisons, harmful substances, and therapeutic drugs in patient body fluids.