Lab Measurements and Temperature Units
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Questions and Answers

What is the reference unit for measuring weights?

gram

What type of machines are used to measure mass and weight?

sensitive machines such as scales and balances

What is a widely used measurement in the lab, similar to mass?

volume, liter

What unit of measurement would be best to measure the volume of a 24-hour urine collection?

<p>1000 mL or 2000 mL flask</p> Signup and view all the answers

Why is it important to examine package inserts and procedures carefully in the lab?

<p>to not mix up or incorrectly use reference ranges and units</p> Signup and view all the answers

What is the relationship between measurements and reports in the lab?

<p>Measurements are reported with values and reference ranges that include associated units.</p> Signup and view all the answers

Why is numerical data important in the laboratory?

<p>Numerical data is important in the laboratory because it is used to record results and provide reference ranges.</p> Signup and view all the answers

What are the three common units used to measure temperature?

<p>Kelvin, Celsius, and Fahrenheit</p> Signup and view all the answers

What is the formula to convert Celsius to Fahrenheit?

<p>(0°C × 9/5) + 32 = °F</p> Signup and view all the answers

What is the unit of measurement for length in the metric system?

<p>Meter</p> Signup and view all the answers

What is the unit of measurement for liquid volume in the metric system?

<p>Liter</p> Signup and view all the answers

What is the unit of measurement for mass in the metric system?

<p>Gram</p> Signup and view all the answers

What is the unit of measurement for mass in reference to a particular volume?

<p>mg/dl</p> Signup and view all the answers

What unit of measurement would be used to measure the length of a biopsy specimen?

<p>Meter or centimeter</p> Signup and view all the answers

Study Notes

Basic Measurements and Applications in the Lab

  • Medical laboratory investigations are always accompanied by some form of data recording (results), which involves numerical data and reference ranges and units.
  • Test procedures often provide results that involve numerical data, and routine operations in the lab expose MLAs to mathematical applications with measurements and related devices.

Temperature Measurements

  • Different ways of recording temperature include Kelvin, Celsius, and Fahrenheit.
  • Water freezes at 273.15 K, 0°C, and 32°F, and boils at 373.15 K, 100°C, and 212°F.
  • Celsius and Kelvin are the most common measurements used in the lab.
  • Temperature conversions: Celsius to Fahrenheit: (0°C × 9/5) + 32 = 32°F, and Fahrenheit to Celsius: (°F − 32) × 5/9 = °C.
  • 45 degrees Fahrenheit is equivalent to 7.2°C.

The Metric System

  • The metric system uses units such as Meter, Liter, and Gram to measure length, liquid volume, and mass.
  • Most measurements in the lab are recorded using these units.
  • Mass is also commonly recorded in reference to a particular volume (e.g., mg/dl).

Mass and Volume

  • Units of weight are measured on both sides of the "gram", with names of weights below and above the reference of the gram.
  • Sensitive machines (scales and balances) are used to measure these values.
  • The liter is one of the most widely used measurements in the lab, with measurements above and below, but most are below.
  • Many measurements of mass are referenced to a particular volume of the specimen, such as mg/dl, ng/ml.

Measurement Devices

  • Scales and balances are used to measure mass.
  • A 1000 mL flask is the best option to measure the volume of a 24-hour urine collection.

Important Notes

  • All departments of the lab use some form of these measurements, including solutions, powders, stains, and other chemicals.
  • Reports are issued with values and reference ranges that include associated units, and careful examination of package inserts and procedures is necessary to avoid mistakes.

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Description

This quiz covers basic measurements and applications in a medical laboratory, including temperature measurements and unit conversions.

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