Clinical Microscopy and Body Fluids Review

Comprehensive vocabulary flashcards covering renal diseases, amniotic fluid and hCG testing, sputum and bronchoalveolar lavage examinations, cerebrospinal fluid (CSF) analysis, and semen analysis based on clinical microscopy lecture notes.

Acute Post-Streptococcal Glomerulonephritis

A glomerular disorder caused by the deposition of immune complexes formed in conjunction with Group A Streptococcus infection on glomerular membranes; laboratory findings include macroscopic hematuria, proteinuria, dysmorphic RBCs, RBC casts, granular casts, and positive ASO and anti-DNase B titers.

Rapidly Progressive (Crescentic) Glomerulonephritis

A glomerular disorder characterized by cellular proliferation of epithelial cells inside Bowman's capsule forming crescents, driven by the deposition of immune complexes from systemic immune disorders (such as SLE).

Goodpasture Syndrome

A cytotoxic disorder caused by the deposition of antiglomerular basement membrane antibody against both glomerular and alveolar basement membranes, leading to macroscopic hematuria, proteinuria, and RBC casts.

Granulomatosis with Polyangiitis (Wegener's Granulomatosis)

A vasculitis where anti-neutrophilic cytoplasmic auto-antibodies (ANCA) bind neutrophils in vascular walls, producing damage to small vessels in the lungs and glomerulus; demonstrates perinuclear ANCA (p-ANCA) when fixed with ethanol and cytoplasmic ANCA (c-ANCA) when fixed with formalin.

Henoch-Schönlein Purpura

A disorder occurring primarily in children following viral respiratory infections, characterized by a decrease in platelets that disrupts vascular integrity, leading to macroscopic hematuria, proteinuria, and RBC casts.

Membranous Glomerulonephritis (MGN)

A disorder characterized by the thickening of the glomerular basement membrane following IgG immune complex deposition associated with systemic disorders; typical findings include microscopic hematuria and proteinuria.

Membranoproliferative Glomerulonephritis (MPGN)

A glomerular disease involving cellular proliferation affecting capillary walls or the glomerular membrane; divided into Type 1 (increased subendothelial cellularity), Type 2 (extremely dense deposits in the GBM and tubules), and Type 3 (both subepithelial and subendothelial deposits).

Chronic Glomerulonephritis

A condition with marked decrease in renal function resulting from persistent glomerular damage precipitated by other renal diseases; marked by hematuria, proteinuria, glucosuria, cellular casts, granular casts, and waxy and broad casts progressing to renal failure.

IgA Nephropathy (Berger's Disease)

A renal condition marked by the deposition of IgA on the glomerular membrane resulting from increased circulating IgA levels; presents with hematuria in early stages and progresses to features of chronic glomerulonephritis in late stages.

Minimal Change Disease (Nil Disease / Lipoid Nephrosis)

A condition common in children following allergic reactions and immunizations, characterized by normal light microscopy findings, loss of podocyte foot processes visible on electron microscopy, association with HLA-B12, heavy proteinuria, transient hematuria, and fat droplets.

Focal Segmental Glomerulosclerosis (FSGS)

A glomerular disease characterized by disruption of podocytes in selected glomeruli and specific regions, showing sclerotic areas with evident IgM and C3 deposits on immunofluorescence.

Diabetic Nephropathy (Kimmelstiel-Wilson Disease)

The most common cause of end-stage renal disease (ESRD), characterized by the deposition of glycosylated proteins on the glomerular basement membrane resulting from poorly controlled blood glucose; detected via microalbuminuria and a positive Micral test.

Alport Syndrome

An inherited genetic disorder characterized by lamellation and thinning of the glomerular basement membrane.

Nephrotic Syndrome

A renal disorder resulting from the disruption of the electrical charges that form the podocyte barrier, marked by massive protein loss at a rate of $>3.5\,\text{g/day}$, hypoalbuminemia, lipiduria, oval fat bodies, and fatty and waxy casts.

Acute Tubular Necrosis (ATN)

Destruction of renal tubular epithelial cells caused by ischemia or toxic agents; characterized by microscopic hematuria, proteinuria, renal tubular epithelial (RTE) cells, RTE casts, broad and waxy casts, and an odorless urine.

Uromodulin-Associated Kidney Disease (UKD)

An inherited condition featuring abnormal uromodulin production that destroys renal tubular epithelial cells, accompanied by hyperuricemia causing gout.

Fanconi Syndrome

A generalized failure of tubular reabsorption in the proximal convoluted tubule, presenting with glucosuria and possible cystine crystals in the urinary sediment.

Diabetes Insipidus

A polyuric disorder producing urine with low specific gravity and volume exceeding $>15\,\text{L/day}$; classified as neurogenic (failure of the hypothalamus to produce ADH) or nephrogenic (inability of the renal tubules to respond to ADH).

Renal Glycosuria

A condition characterized by defective tubular reabsorption of glucose, resulting in glucosuria despite normal blood glucose levels.

Cystitis

An ascending bacterial infection of the urinary bladder presenting with urinary frequency, burning, microscopic hematuria, increased pH, mild proteinuria, WBCs, and bacteria, but no casts.

Acute Pyelonephritis

An infection affecting the renal tubules and interstitium related to vesicoureteral reflux or untreated cystitis; characterized microscopically by WBCs, bacteria, microscopic hematuria, WBC casts, and bacterial casts.

Acute Interstitial Nephritis (AIN)

Allergic inflammation of the renal interstitium in response to medications; characterized by hematuria, proteinuria, elevated eosinophils, WBC casts containing eosinophils, and the absence of bacteria.

Telescoped Sediment

A urinary sediment displaying a simultaneous variety of casts (cellular, coarsely granular, finely granular, and waxy) in the same specimen, characteristic of progressive renal failure or end-stage renal disease (ESRD).

Lithotripsy

A procedure utilizing high-energy shock waves to pulverize and break kidney stones into small fragments.

Calcium Oxalate Calculi

The major constituent ($\approx 75\%$ of all renal calculi, with $35\%$ purely calcium oxalate); physically described as very hard, dark in color, and having a rough surface.

Triple Phosphate Calculi

Kidney stones composed of magnesium ammonium phosphate accompanied by urinary infections involving urea-splitting bacteria, classically forming branching/staghorn shapes resembling deer antlers.

Cystine Calculi

Rare ($\approx 2\%$) kidney calculi observed in hereditary metabolic disorders of cystine; characterized as yellow-brown, greasy, and resembling old soap.

Human Chorionic Gonadotropin (hCG)

A pregnancy-associated hormone produced by placental syncytiotrophoblast cells that peaks during the first trimester; consists of an alpha subunit identical to LH, FSH, and TSH, and a beta subunit that confers hormonal specificity.

Home-Based hCG Pregnancy Test Kit

A diagnostic kit operating on an enzyme immunoassay principle using first-morning urine, rabbit anti-hCG antibodies, and a typical detection cutoff threshold of $25\,\text{mIU/mL}$.

Fern Test

A diagnostic procedure used to detect premature rupture of membranes (PROM) or early pregnancy; specimen vaginal fluid is air-dried on a glass slide, producing microscopic fern-like crystals in the presence of protein and $\text{NaCl}$.

Polyhydramnios

An abnormal excess of amniotic fluid volume ($>1{,}200\,\text{mL}$) commonly caused by decreased fetal swallowing of urine or neural tube defects.

Oligohydramnios

An abnormal reduction of amniotic fluid volume ($<800\,\text{mL}$) commonly caused by increased fetal swallowing, membrane leakage, or urinary tract deformities.

Lecithin/Sphingomyelin (L/S) Ratio

The reference method for evaluating fetal lung maturity using thin-layer chromatography; an L/S ratio of $\ge 2.0$ indicates mature fetal lungs.

Amniostat-FLM

An immunologic test for phosphatidylglycerol (PG) used to assess fetal lung maturity; unlike the L/S ratio, it is unaffected by contamination from blood or meconium.

Lamellar Body Count (LBC)

An assessment of fetal surfactant storage vesicles produced by Type II pneumocytes; counted via hematology analyzer platelet channels, where a count $>32{,}000/\mu\text{L}$ denotes adequate fetal lung maturity.

Alpha-Fetoprotein (AFP)

The major protein produced by the fetal liver prior to $18\,\text{weeks}$ of gestation, used as a screening test to detect neural tube defects (increased levels) and Down syndrome (decreased levels).

Sialic Acid

The most important single chemical component determining the viscosity of sputum secretions.

Dittrich's Plugs

Macroscopic pinhead-sized yellow or gray bronchial concretions seen in bronchitis and bronchiectasis that release a foul odor when crushed.

Broncholiths (Pneumoliths)

Hard calcified pulmonary concretions ('lung stones') found in bronchi, most commonly associated with histoplasmosis or chronic tuberculosis.

Charcot-Leyden Crystals

Colorless, hexagonal, double-pyramidal microscopic structures arising from the disintegration of eosinophils, commonly seen in the sputum of patients with bronchial asthma.

Curschmann's Spirals

Microscopic coiled mucus strands found in sputum, clinically significant for bronchial asthma.

Creola Bodies

Microscopic clusters of exfoliated columnar epithelial cells identified in the sputum of patients with bronchial asthma.

Bronchoalveolar Lavage (BAL)

A procedure where saline is instilled into and withdrawn from distal bronchi using a bronchoscope to examine alveolar cytology; serves as a vital diagnostic test for Pneumocystis carinii (jirovecii) when stained with Grocott's methenamine silver.

Gibson and Cooke Pilocarpine Iontophoresis

A sweat-inducing procedure utilizing pilocarpine and an applied current of $0.16\,\text{mA}$ for $5\,\text{minutes}$; used in the diagnosis of cystic fibrosis, where sweat sodium and chloride levels $>70\,\text{mEq/L}$ are diagnostic.

Choroid Plexus

The specialized vascular structure responsible for producing cerebrospinal fluid by selective filtration at a rate of approximately $20\,\text{mL/hour}$.

Arachnoid Villi (Granulations)

Endothelial structures responsible for the reabsorption of cerebrospinal fluid back into the venous circulation.

Subarachnoid Space

The anatomical space located between the arachnoid mater and the pia mater through which cerebrospinal fluid flows.

Xanthochromia

A pink, yellow, or orange discoloration of cerebrospinal fluid supernatant caused by hemoglobin degradation products, hyperbilirubinemia, elevated protein ($>150\,\text{mg/dL}$), carotene, melanin, or rifampin.

Pellicle

A delicate, web-like clot that forms in cerebrospinal fluid following $12\text{--}24\,\text{hours}$ of refrigeration, classically indicative of tubercular meningitis.

Pleocytosis

An abnormal clinical condition defined by an increased number of normal white blood cells within the cerebrospinal fluid.

CSF/Serum Albumin Index

A parameter evaluating blood-brain barrier integrity calculated as $\frac{\text{CSF Albumin (mg/dL)}}{\text{Serum Albumin (g/dL)}}$; values $<9$ are normal, $9\text{--}14$ indicate slight impairment, $15\text{--}30$ moderate impairment, $>30$ severe impairment, and $100$ complete breakdown.

IgG Index

A calculated ratio used to assess intrathecal IgG synthesis within the central nervous system; values $>0.70$ indicate active CNS immunoglobulin production (e.g., in multiple sclerosis).

Oligoclonal Banding

Distinct bands appearing in the gamma region of CSF electrophoresis indicating intrathecal immunoglobulin production; the presence of two or more bands in CSF that are absent in serum is diagnostic for multiple sclerosis.

Myelin Basic Protein (MBP)

A protein constituent of the nerve axon insulation sheath whose presence in CSF indicates active demyelination, measured via immunoassay to monitor multiple sclerosis course.

CSF Glutamine

A synthesis product of ammonia and alpha-ketoglutarate reflecting indirect excess cerebral ammonia; elevated concentrations ($>35\,\text{mg/dL}$) correlate with coma and Reye's syndrome.

Limulus Amoebocyte Lysate (LAL) Test

An assay utilizing horseshoe crab amoebocyte lysate to detect Gram-negative endotoxin in CSF and medical equipment through amoebocyte clumping or gel clot formation.

Sertoli Cells

Supportive 'nurse' cells located within the seminiferous tubules of the testes that nourish developing germ cells during spermatogenesis.

Seminal Vesicles

Accessory male sex glands producing $60\%\text{--}70\%$ of seminal volume; secretions are rich in fructose to provide essential nutrient energy for sperm motility.

Prostate Gland Secretion

An acidic fluid accounting for $20\%\text{--}30\%$ of semen volume containing acid phosphatase, zinc, citric acid, and enzymes responsible for seminal coagulation and subsequent liquefaction.

Bulbourethral Gland Secretion

A thick alkaline mucus constituting $5\%$ of ejaculate volume that serves to neutralize acidic residues from the urethra and vaginal vault.

Varicocele

Hardening and dilation of veins draining the testes, identified as the most common cause of male infertility and typically accompanied by tapered sperm head morphology.

Modified Blom's Test

A sperm vitality test performed within $1\,\text{hour}$ of ejaculation using eosin and nigrosin dyes; living cells remain bluish-white (unstained) while dead spermatozoa with compromised membranes stain red.

Resorcinol Test (Seliwanoff's Test)

A screening chemical reaction yielding an orange-red color in the presence of seminal fructose, indicating normal secretion from the seminal vesicles.

Florence Test

A nonspecific forensic test for semen detection that reacts choline with iodine and potassium iodide reagents to form dark brown rhombic crystals.

Barbiero's Test

A specific forensic test for semen identification reacting spermine with saturated picric acid and trichloroacetic acid to form yellow leaf-like crystals.

Aspermia

The complete absence of semen or ejaculate during ejaculation.

Azoospermia

The complete absence of spermatozoa within an ejaculate specimen.

Necrozoospermia

A semen abnormality characterized by an increased proportion of dead or completely immotile spermatozoa.

Oligozoospermia

A condition characterized by a subnormal sperm concentration ($<20\times 10^{6}\,\text{sperms/mL}$).

Normal Spermatozoon Anatomy and Dimensions

A normal spermatozoon featuring an oval head measuring $5\,\mu\text{m}$ in length by $3\,\mu\text{m}$ in width with an acrosome covering $1/4$ of the head and $2/3$ of the nucleus, a mitochondria-containing neck/midpiece ($7\,\mu\text{m}$), and a flagellar tail ($45\,\mu\text{m}$).