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MLAB 2401: Clinical Chemistry

UNITS OF MEASURE. Measurement requires a numerical value and a unitLaboratory results almost always have units of measurement associated with themSI units: length ( meter ) mass ( gram ) quantity ( mole )Volume ( liter )Time ( second )Basic units describe unrelated physical quantities.

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MLAB 2401: Clinical Chemistry

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    1. 1 MLAB 2401: Clinical Chemistry Basic Principles and Practice of Clinical Chemistry Part One

    2. UNITS OF MEASURE Measurement requires a numerical value and a unit Laboratory results almost always have units of measurement associated with them SI units: length ( meter ) mass ( gram ) quantity ( mole ) Volume ( liter ) Time ( second ) Basic units describe unrelated physical quantities 2

    3. Unit of Measure: Prefixes Common prefixes and abbreviations that are added to units of measure: deci (d) 10-1 centi (c) 10-2 milli (m) 10-3 micro ( µ) 10-6 nano (n) 10-9 pico (p) 10-12 femto (f) 10-15 Example: A common unit of liquid measurement is a deciliter( dl ), or one – tenth of a liter Combine a prefix with a basic unit results in a statement of a specific length, weight or volume Reporting clinical chemistry results may be in units such as : mg / dL g / dL mEq / L 3

    4. Scientific Notation True scientific notation format: 1.22 X 104 BUT in hemo, for example a hemoglobin result would look like = 12.2 X 103 4

    5. Water Specifications Tap water is unsuitable for lab use (too many impurities) Types of water purification techniques Distillation – removes most organic matter Reverse osmosis-removes organic, ionic, microbial, and viral contaminants Ultrafiltration – removes particulate matter, bacteria, emulsified solids Deionization – ions removed Reagent Grades of water Type I Purest – Required for sensitive tests Type II Acceptable for most uses Type III OK for washing glassware CAP - QC of water : pH, electrical resistance, bacterial culture 5

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