Q: A patient’s blood glucose is reported as 5.6 mmol/L. What is the equivalent value in mg/dL? (Molar mass of glucose = 180 g/mol)

$$5.6 \times 18 = 100.8 mg/dL$$

Q: Which of the following is a correct temperature conversion formula from Celsius to Fahrenheit?

$$F = (C \times \frac{9}{5}) + 32$$

Q: A laboratory result is reported as 100 mg/dL. What is the value in g/L?

$$100 \text{ mg/dL} = 1 \text{ g/L}$$

Q: A laboratory technician needs to convert 0.5 liters (L) to microliters ($$\muL). $$What is the correct conversion?

$$0.5 \times 1,000,000 = 500,000$$ \mu L

Q: A laboratory result is reported as 2.5 hours. How many minutes is this?

$$2.5 \times 60 = 150$$ minutes

Question 1

Which of the following is NOT one of the three main systems of measurement used in laboratory medicine?

Accepted Answer

Imperial system

Question 2

A laboratory result is reported as '90' without any unit. Why is this problematic in clinical practice?

Accepted Answer

Units are necessary to define the dimension and meaning of the measurement.

Question 3

Which of the following is the correct SI base unit for temperature?

Accepted Answer

Kelvin (K)

Question 4

A patient’s blood glucose is reported as 5.6 mmol/L. What is the equivalent value in mg/dL? (Molar mass of glucose = 180 g/mol)

Accepted Answer

$$5.6 	imes 18 = 100.8 mg/dL$$

Question 5

Which of the following is a correct SI base unit and its abbreviation?

Accepted Answer

Second (s)

Question 6

Convert 250 milliliters (mL) to liters (L) using the metric system.

Accepted Answer

$$250 \div 1000 = 0.25 L$$

Question 7

Which of the following best explains why the SI system is preferred in scientific laboratories?

Accepted Answer

It is standardized worldwide and based on fundamental units.

Question 8

A laboratory technician needs to convert 3.5 kilometers (km) to meters (m). What is the correct conversion?

Accepted Answer

$$3.5 	imes 1000 = 3500 m$$

Question 9

Which of the following is a correct temperature conversion formula from Celsius to Fahrenheit?

Accepted Answer

$$F = (C 	imes \frac{9}{5}) + 32$$

Question 10

A sample is measured as 0.02 grams. Express this value in milligrams (mg).

Accepted Answer

$$0.02 	imes 1000 = 20 mg$$

Question 11

Which of the following is a non-SI unit commonly used in clinical laboratory analyses?

Accepted Answer

Minute (min)

Question 12

A laboratory result is reported as 100 mg/dL. What is the value in g/L?

Accepted Answer

$$100 	ext{ mg/dL} = 1 	ext{ g/L}$$

Question 13

Which of the following is the correct order of operations according to PEMDAS?

Accepted Answer

Parentheses, Exponents, Multiplication/Division, Addition/Subtraction

Question 14

A laboratory technician needs to convert 0.5 liters (L) to microliters ($$\muL). $$What is the correct conversion?

Accepted Answer

$$0.5 	imes 1,000,000 = 500,000$$ \mu L

Question 15

Which of the following best describes the main advantage of the metric system in laboratory measurements?

Accepted Answer

It is based on increments of 10, making conversions straightforward.

Question 16

A clinical result is reported as 37°C. What is the equivalent temperature in Kelvin?

Accepted Answer

$$37 + 273.15 = 310.15 K$$

Question 17

Which of the following is a correct abbreviation for the SI base unit of electric current?

Accepted Answer

A

Question 18

A laboratory result is reported as 2.5 hours. How many minutes is this?

Accepted Answer

$$2.5 	imes 60 = 150$$ minutes

Question 19

Which of the following is a correct statement about the use of SI units in laboratory medicine?

Accepted Answer

SI units unify physical measurements worldwide, improving precision and comparability.

Question 20

A laboratory technician needs to convert 0.75 deciliters (dL) to milliliters (mL). What is the correct conversion?

Accepted Answer

$$0.75 	imes 100 = 75 mL$$

Systems of Measurement in Laboratory Science

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