Medical Unit Conversions Quiz
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Questions and Answers

Which of the following SI units is primarily used to measure volume in medicine?

  • Meter (m)
  • Gram (g)
  • Mole (mol)
  • Liter (L) (correct)

What does the prefix 'milli' signify in SI units?

  • 1/100 or 10^-2
  • 1/1,000,000 or 10^-6
  • 1/10 or 10^-1
  • 1/1000 or 10^-3 (correct)

Which operation would be used to convert 1500 milliliters to liters?

  • Subtract 1000
  • No conversion needed
  • Multiply by 1000
  • Divide by 1000 (correct)

The prefix 'deci' in SI units represents which of the following?

<p>1/10 or 10^-1 (D)</p> Signup and view all the answers

What is the relationship between kilometers and meters?

<p>1 kilometer equals 1000 meters (C)</p> Signup and view all the answers

Which metric prefix would you use to denote one-millionth of a unit?

<p>Micro (D)</p> Signup and view all the answers

To convert larger units to smaller units in the SI system, you would...

<p>Multiply by the value of the prefix (D)</p> Signup and view all the answers

Which of the following represents a common unit for measuring wavelengths of light?

<p>Nanometer (nm) (A)</p> Signup and view all the answers

What is the equivalent of 1 meter in feet?

<p>3.281 feet (D)</p> Signup and view all the answers

Which of the following is true regarding the conversion of Fahrenheit to Celsius?

<p>C = (F - 32) / 1.8 (A), C = 5/9 (F - 32) (C)</p> Signup and view all the answers

How many grams are contained in one pound?

<p>454 grams (C)</p> Signup and view all the answers

What is the SI unit for measuring liquid volume?

<p>Liter (L) (B)</p> Signup and view all the answers

Which of the following measurements is NOT commonly made in a clinical laboratory?

<p>Electrical conductivity (B)</p> Signup and view all the answers

Which metric prefix denotes one billionth (10^-9)?

<p>Nano (A)</p> Signup and view all the answers

What are significant figures in a measurement?

<p>Digits that contribute to the precision and accuracy of a measurement (B)</p> Signup and view all the answers

How is a decimal number expressed?

<p>As a combination of whole numbers and fractions using a decimal point (C)</p> Signup and view all the answers

Which metric prefix represents a factor of one millionth?

<p>Micro- (B)</p> Signup and view all the answers

When reporting laboratory results, why is it important to compare measurements to reference values?

<p>To assess a patient's condition accurately (B)</p> Signup and view all the answers

Which of the following numbers contains three significant figures?

<p>12.30 (B)</p> Signup and view all the answers

What is the primary purpose of using the decimal number system in laboratory measurements?

<p>To simplify the representation of large and small values (B)</p> Signup and view all the answers

Which common SI unit is typically used to measure the concentration of a substance in medicine?

<p>Molarity (mol/L) (D)</p> Signup and view all the answers

Which of the following is NOT a component of quantitative laboratory results?

<p>Color (D)</p> Signup and view all the answers

What does the decimal point in a decimal number signify?

<p>A separation between whole and fractional parts (C)</p> Signup and view all the answers

Which of the following statements about significant figures is correct?

<p>Leading zeros in a number are never significant. (B)</p> Signup and view all the answers

What is the significant figure representation of the measurement 0.007 g?

<p>7.0 x 10^-3 g (A)</p> Signup and view all the answers

Which measurement has the greatest number of significant figures?

<p>9.8000 x 10^4 m (B)</p> Signup and view all the answers

When performing calculations, why is rounding necessary?

<p>To obtain results with an appropriate number of significant figures. (C)</p> Signup and view all the answers

In significant figures, which of the following does NOT affect rounding?

<p>The presence of leading zeros. (B)</p> Signup and view all the answers

Which of the following correctly represents the SI unit for mass?

<p>Kilogram (kg) (B)</p> Signup and view all the answers

What is the main benefit of using the SI system of units?

<p>It provides a uniform method for describing physical quantities. (D)</p> Signup and view all the answers

Which metric prefix represents a factor of 10^-3?

<p>Milli- (B)</p> Signup and view all the answers

Which of the following correctly demonstrates a conversion within the metric system?

<p>1 liter (L) = 1000 milliliters (mL) (B)</p> Signup and view all the answers

What rule applies when rounding a number that ends with a 5?

<p>The preceding number remains the same if it is even. (A)</p> Signup and view all the answers

What is the correct SI unit for expressing blood cell counts?

<p>cells per liter (A)</p> Signup and view all the answers

Which of the following best describes the proper use of significant figures in lab measurements?

<p>Significant figures provide a realistic estimate of expected concentrations. (C)</p> Signup and view all the answers

When diluting a concentrated solution, which equation is used to determine the volumes and concentrations involved?

<p>V1 x C1 = V2 x C2 (D)</p> Signup and view all the answers

In the metric system, what does the prefix 'micro-' denote?

<p>10^-6 (D)</p> Signup and view all the answers

What has the Clinical and Laboratory Standards Institute (CLSI) recommended regarding the reporting of chemical substances?

<p>Use micromoles or millimoles per liter for reporting. (B)</p> Signup and view all the answers

How is a dilution expressed when serum is mixed in a ratio of 1 to 5?

<p>1:5 (B)</p> Signup and view all the answers

Which of the following is an essential step when preparing laboratory solutions?

<p>Utilize glassware with a known capacity. (B)</p> Signup and view all the answers

What does the term 'serial dilution' refer to in laboratory practices?

<p>A sample diluted multiple times by the same factor. (B)</p> Signup and view all the answers

What is the commonly used SI unit for measuring concentrations like glucose in blood?

<p>millimoles per liter (mmol/L) (B)</p> Signup and view all the answers

Which of the following is not a recommended safety practice in the laboratory?

<p>Prepare solutions without protective equipment. (C)</p> Signup and view all the answers

Flashcards

SI Unit Prefixes

Represent multiples or fractions of base SI units (like meter, liter, gram).

Kilo (k)

Prefix meaning 1000 times the base unit.

Milli (m)

Prefix meaning one-thousandth of the base unit.

Converting from smaller to larger units

Divide by the multiple represented by prefix difference.

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Converting from larger to smaller units

Multiply by the multiple represented by prefix difference

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Centi (c)

Prefix meaning one-hundredth of the base unit.

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Micro (µ)

Prefix meaning one-millionth of the base unit.

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Nano (n)

Prefix meaning one-billionth of the base unit.

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Meter (m) to feet (ft)

1 meter is equivalent to 3.281 feet.

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Kilometer (km) to mile (mi)

1 kilometer is equivalent to 0.621 miles.

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Gram (g) to pound (lb)

454 grams are equivalent to 1 pound.

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Liter (L) to gallon (gal)

3.78 liters are equivalent to 1 gallon.

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Celsius (°C) to Fahrenheit (°F)

Celsius is the metric temperature scale used in most countries, while Fahrenheit is mostly used in the US.

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Significant Figures

Digits that contribute to accuracy and precision of a measurement; known digits plus an estimated one.

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Decimal Point

The dot separating the whole number part from the fractional part in a decimal number.

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Decimal Number System

Used to express whole numbers and fractions.

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Digit

Individual symbol in a number.

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Number

One or more digits used to describe quantity.

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Figure

Representative number used to explain calculated data.

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Laboratory Measurements

Measurements of concentration, number, weight, volume, size for analyzing patient samples.

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Quantitative Lab Results

Laboratory results that include numerical values about a patient's sample.

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Concentration

Amount of a substance in a specific volume.

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Reference Values

Normal values used to evaluate patient samples.

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Leading Zeros

Zeros that precede the first non-zero digit in a number. They are NOT significant figures.

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Trailing Zeros

Zeros that appear after the final non-zero digit without a decimal point are NOT significant.

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Trailing Zeros with a Decimal

Trailing zeros after a decimal point are significant.

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Rounding Rules

Rules used to simplify numbers while maintaining a certain level of accuracy.

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Rounding Up

Increase the preceding digit by one if the dropped digit is 5 or greater.

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Rounding Down

Keep the preceding digit as is if the dropped digit is less than 5.

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Systme International d'Units (SI)

The internationally recognized system of units used for measurement.

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SI Base Units

7 fundamental units in the SI system (meter, kilogram, second, ampere, kelvin, mole, candela).

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SI Derived Units

Units formed by combining SI base units.

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SI Units in Lab Reporting

The International System of Units (SI) is used for consistent reporting of laboratory results, replacing traditional units like milligrams per deciliter (mg/dL).

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SI Units for Blood Cell Counts

Blood cell counts are now reported as cells per liter (cells/L) instead of cells per cubic millimeter (cells/cu mm).

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SI Units for Chemical Substances

Chemical substances like bilirubin, protein, and glucose are now reported as milligrams or grams per liter (mg/L or g/L) or as micromoles (µmol) or millimoles (mmol) per liter.

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Solution Preparation

Preparing solutions for laboratory use involves precise calculations and techniques, such as dilutions, ratios, percent solutions, and molar solutions.

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Importance of Accuracy in Solution Preparation

Using accurate volumetric glassware, sensitive balances, and appropriate significant figures ensures accurate and reliable solutions for laboratory experiments.

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Changing Concentrations

Adjusting solutions to different concentrations involves dilution or concentration techniques using the formula V1 x C1 = V2 x C2.

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Dilution

A dilution is a process of reducing the concentration of a solution by adding more solvent. It is usually expressed as a ratio, proportion, or fraction.

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Dilution Calculation

The formula AT/(A+B) = C is used to calculate dilutions, where A is the volume of the original solution, B is the volume of the diluent, and C is the dilution factor.

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Serial Dilution

Serial dilutions involve diluting a sample multiple times by the same dilution factor, creating a series of decreasing concentrations.

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