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Terminology, etc from Lab Value Lectures
Terminology
115
Other
Not Applicable
11/03/2012

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Term
numerical ranges (ex: Serum Potassium)
Definition
Quantitative
Term
positive or negative (ex: Pregnancy Test)
Definition
Qualitative
Term
percent of positive results in patients with disease
Definition
Sensitivity
Term
percent of negative results in patients who do not have the disease
Definition
Specificity
Term
population mean +/- 2 standard deviations
Definition
Reference or Normal Range
Term
Normal value for a patient used to assess current patient status
Definition
Baseline Studies
Term
A compound that is ionizable in a solution
Definition
Electrolyte
Term
Total number of particles in solution
Definition
Osmolality
Term
found within cells
Definition
intracellular fluid
Term
found outside the cells
Definition
extracellular fluid
Term
Includes Na+, K+, Cl-, CO2, BUN, SCr, Glucose, Ca2+
Definition
Basic Metabolic Panel
Term
Includes BMP, AST, ALT Phos, T-Bili, T-Protein, and Albumin
Definition
Complete Metabolic Panel
Term
Most abundant cation in the ECF
Definition
Sodium
Term
Hypervolemic
Definition
Volume overload
Term
Hypovolemic
Definition
Volume depleted
Term
Euvolemic
Definition
Volume Neutral
Term
Causes of hyponatremia
Definition
Dilutional/Fluid Overload and Sodium Depletion
Term
Dilutional/Fluid Overload
Definition
Cirrhosis, CHF, Renal Failure, SIADH
Term
Sodium Depletion
Definition
Mineralcorticoid deficiencies, Sodum wasting, renal disease, fluid replacement with non-saline solutions
Term
Clinical Presenation includes nausea, malaise, H/A, lethargy, stupor-->seizures-->coma, confusion, obtundation, muscle cramps, edema
Definition
Hyponatremia
Term
Causes of hypernatremia
Definition
Loss of water/dehyration and excessive intake
Term
Clinical Presentation includes thirst, restlessness, irritability, lethargy, muscle twitching, seizures, hyper-reflexia, coma, death
Definition
Hypernatremia
Term
Types of Hyponatremia
Definition
hypervolemic, hypovolemic, euvolemic
Term
Types of Hypernatremia
Definition
hypovolemic, euvolemic
Term
Plays a role in muscle/nervous system excitability
Definition
Potassium
Term
Causes of hypokalemia
Definition
decreased intake, increased loss, and intracellular shift
Term
Decreased intake of potassium can be due to:
Definition
alcoholism, eating disorders, plain IV fluids
Term
Increased renal loss of potassium can be due to
Definition
corticosteroids, loop diuretics, Ampho B, hyperaldosteronism or Cushing's Disease
Term
Increased extrarenal loss of potassium can be due to
Definition
severe diarrhea/laxative abuse, vomiting
Term
intracellular shift causing hypokalemia can be due to
Definition
alkalosis, insulin, beta2 adrenergic stimulation
Term
Clinical presentation includes EKG changes, hypotension, cramps, weakness, and possible areflexia
Definition
Hypokalemia
Term
Causes of Hyperkalemia
Definition
Decreased excretion, increased cellular breakdown, increased intake, extracellular shift
Term
Decreased excretion causing hyperkalemia can be due to
Definition
renal dysfunction, ACE-1, K-sparing diuretic
Term
Increased cellular breakdown in hyperkalemia can be due to
Definition
burns, tumor lysis syndrome, crush injuries
Term
Increased intake in hyperkalemia can be due to
Definition
salt substitutes, total parenteral nutrition (TPN) or IV fluids
Term
extacellular shift in hyperkalemia can be due to
Definition
acidosis
Term
Clinical Presentation includes peaked T-waves (severe), hypotension, bradycardia, cardiac arrest
Definition
Hyperkalemia
Term
Improperly drawn, needle too small, cells cyse, potassium released are all examples that can cause
Definition
Pseudohyperkalemia
Term
Primary role is acid-base balance
Definition
Chloride
Term
Important buffer
Definition
bicarbonate/carbon dioxide
Term
Co-factor for nzyme systems (ATP), intracellular cation
Definition
Magnesium
Term
Causes of hypomagnesemia
Definition
increased loss (GI or renal) and decreased intake
Term
Increased loss in hypomagnesemia can be due to
Definition
diarrhea, hyperparathyroidism, DKA, loop/thiazide diuretics
Term
Decreased intake in hypomanesemia can be due to
Definition
malnutrition or chronic alcoholism, small bowel bypass
Term
Clinical presentation includes muscle weakness, tremor, increased reflexes, cardiac dysrhythmias, trousseau's sign, chvotek's sign, refractory hypokalemia or hypocalcemia
Definition
Hypomagnesemia
Term
Causes of Hypermagnesemia
Definition
Decreased excretion and Increased intake
Term
Decreased excretion in hypermagnesemia can be due to
Definition
renal failure (dialysis patients)
Term
Increased intake of Mg2+ in hypermagnesemia can be due to
Definition
antacids
Term
essential for metabolism of protein, carbs, fats
Definition
Phosphate
Term
Phosphate is essential for
Definition
phospholipid membranes, ATP production, release of oxygen from hemoglobin to tissues
Term
Clinical Presentation includes CNS dysfunction, muscle weakness, Cardiac irregularities, Dysfunction of leukocytes and erythrocytes, and decreased wound healing
Definition
Hypophosphatemia
Term
Hypophosphatemia can cause
Definition
dysfunction of leukocytes and erythrocytes; decreased wound healing
Term
Causes of Hypophosphatemia
Definition
increased renal excretion, decreased GI uptake, intracellular shift,
Term
Increased Renal Excretion in hypophosphatemia can be due to:
Definition
hyperparathyroidism, DKA, Thiazides/Loop diuretics
Term
Decreased GI uptake in hypophosphatemia can be due to:
Definition
excess antacids, vitamin D deficiency, diarrhea
Term
Intracellular shift in hypophosphatemia can be due to:
Definition
alcoholism, TPN or excess glucose
Term
Increased intake of Vitamin D or phosphate in hyperphsphatemia can be due to
Definition
excess intake of antacids or laxatives, espeically with renal insufficiency
Term
Has a role in neuromuscular activity, endocrine function blood coagulation
Definition
Calcium
Term
~50% in ECF is protein bound (albumin)
Definition
Calcium
Term
serum calcium level may not accurately reflect the phsyiological calcium concentration
Definition
hypoalbuminemia
Term
Causes of hypocalcemia
Definition
impaired mobilization, hypoparathyroidism, electrolyte imbalance, abnormal renal loss/renal failure, increased binding,diminished intake, hypoalbuminemia
Term
electrolyte imbalance in hypocalcemia can be due to
Definition
vitamin D deficiency, hypomagnesemia, hyperphophatemia
Term
increased binding in hypocalcemia can be due to
Definition
alkalosis, rapid blood transfusion
Term
Hallmark sign of this is tetany
Definition
Hypocalcemia
Term
Causes of Hypercalemia
Definition
increased absorption, increased bone resorption, malignancy, hyperparathyroidism, decreased elimination
Term
most common causes of hypercalcemia
Definition
malignancy and hyperparathyroidism
Term
General Clinical Presentation includes fatigue, depression, memory loss/confusion, Trousseau and Chvostek signs, muscle cramps, paraesthesia, seizures
Definition
Hypocalcemia
Term
Clinical presentation of hypocalcemia
Definition
arrythmias, increased ST segment, icnreased QT interval, hypotension, decreased response to medications
Term
nausea/vomiting, abdominal pain, anorexia, constipation are GI Clinical presenations of
Definition
hypercalcemia
Term
lethargy, coma, death, kidney stones, ventricular arrhytmias
Definition
hypercalcemia
Term
Regulated by parathyroid hormone, calcium and phosphorous levels
Definition
Vitamin D
Term
Vitamin D2
Definition
ergocalciferol
Term
Vitamin D3
Definition
cholecalciferol
Term
Causes of hypovitaminosis D
Definition
low sun exposure, inadequate intake, renal or hepatic dysfunction, genetic inheritance
Term
Deficiency of Vitamin D cancause
Definition
Rickets and osteoporosis
Term
Clinical presentation includes muscle weakness, hypotonia, motor retardation, stunted growth in children, biochemical abnormalities
Definition
hypovitaminosis D
Term
symptoms related to hypercalcemia
Definition
Hypervitaminosis D
Term
may indicate liver diseae or water excess
Definition
decreased BUN
Term
can be caused by kidney disease, icnreased protein consumption, GI bleeding or dehydration
Definition
increased BUN
Term
byproductof muscle breakdown
Definition
Creatinine
Term
low muscle mass
Definition
decreased SCr
Term
hemoconcentration, decreased excretion or increased production
Definition
increased SCr
Term
decreased renal perfusion
Definition
dehydration, blood loss, shock
Term
accounts for age, LBW, gender; estimates low
Definition
Cockroft-Gault equation
Term
accoutns for race, age, gender, BUN; estimates high
Definition
MDRD equation
Term
polydipsia, polyurea, polyphagia, blurred vision, dizzy
Definition
hyperglycemia
Term
dizziness, confusion, sweating, tachycardia, hunger, tremor, anxiety
Definition
hypoglycemia
Term
functional liver test; protein synthesis by the liver; maintains oncotic pressure in the vasculature
Definition
Albumin
Term
Causes of Hypoalbuminemia
Definition
malnutrition and malabsorption; over hydration or dilution; nephritic syndrome; pregnancy; burns; chronic illness; hepatic insufficiency
Term
Clinical presentation includes peripheral edema, ascites, pulmonary edema
Definition
Hypoalbuminemia
Term
Causes of Hyperalbuminemia
Definition
Dehydration
Term
Abundant in the liver, heart, kidney, and skeletal muscle; released into the blood after injury to liver cells
Definition
Aspartate aminotransferase (AST)
Term
Specific to liver cells
Definition
Alanine aminotransferase (ALT)
Term
Elevated T-bili caused by
Definition
liver disease, hemolysis, and metabolic abnormalities
Term
produced in gut by bacterial breakdown of proteins
Definition
Ammonia
Term
Most commonly ordered blood lab test
Definition
CBC
Term
skin paleness, weakness, fatigue, and dizziness
Definition
Anemia
Term
MCV, MCH, MCHC
Definition
The Wintrobe Indices
Term
Hyperlipidemia can interfere with testing
Definition
Mean Cell Hemoglobin tests
Term
Always indicates hypochromia i.e. pale colored RBCs that lack HgB
Definition
Mean Cell Hemoglobin Concentration tests
Term
Microcytic
Definition
anemia due to iron deficiency
Term
macrocytic
Definition
anemia due to B12 and/or folate deficiency
Term
nonspecific test; increased with inflammation
Definition
erythrocyte sedimentation rate
Term
decreased platelets
Definition
thrombocytopenia
Term
increased platelets
Definition
thrombocytosis
Term
level of elevation correlates with the stage of heart failure
Definition
B--Type Natriuretic Peptide
Term
Increases WBCs
Definition
Corticosteroids, Granulocyte colony-stimulating factor
Term
Decreases WBCs
Definition
Chemotherapy, Clozapine, Ganciclovir, Colchicines, Azathioprine, Dapsone, Methimazole
Term
To evaluate if a patient is neutropenic
Definition
ANC
Term
Macroscopic Urinalysis Testing
Definition
Color, cloudiness, proteins
Term
Microscopic urinalysis testing
Definition
cells, casts, crystals, proteins
Term
Causes of Hyperphosphatemia
Definition
decreased renal excretion, intracellular to extracellular shift, increased intake of Vitamin D or phosphate
Term
Decreased renal excretion in hyperphosphatemia can be due to
Definition
chronic renal failure, secondary hypoparathyroidism
Term
intracellular to extracellular shift in hyperphosphatemia can be due to
Definition
massive cell breakdown
Term
Clinical presentation includes paresthesia, tetany, hypotension, and arrythmias
Definition
Hyperphosphatemia
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