FREE Medical Laboratory Technician Clinical Chemistry Procedures Questions and Answers

Question 1

A patient sample is received in the lab with a milky, turbid appearance. This characteristic, known as lipemia, is most likely to interfere with which of the following?

Accepted Answer

Spectrophotometric assays

Answer

Direct ion-selective electrode (ISE) measurements

Answer

Immunoassays using magnetic particle separation

Answer

Calculated tests like anion gap

Question 2

A physician orders a trough level for vancomycin, a therapeutic drug. When is the appropriate time to collect the blood specimen for this test?

Accepted Answer

Up to 30 minutes before the next scheduled dose

Answer

60 minutes after the intravenous dose is complete

Answer

Immediately after the intravenous dose is complete

Answer

At a random time between doses

Question 3

A patient's laboratory results are as follows: Sodium: 140 mmol/L, Glucose: 180 mg/dL, BUN: 28 mg/dL. Using the most common formula, what is the calculated serum osmolality?

Accepted Answer

298 mOsm/kg

Answer

288 mOsm/kg

Answer

300 mOsm/kg

Answer

318 mOsm/kg

Question 4

A patient presents to the emergency department with chest pain. Which of the following cardiac markers is the earliest to rise following an acute myocardial infarction (AMI)?

Accepted Answer

Myoglobin

Answer

Creatine Kinase-MB (CK-MB)

Answer

Lactate Dehydrogenase (LDH)

Answer

Cardiac Troponin I (cTnI)

Question 5

A patient's liver function panel shows a significantly elevated Alanine Aminotransferase (ALT) and Aspartate Aminotransferase (AST), with an AST:ALT ratio greater than 2:1. Gamma-glutamyl transferase (GGT) is also markedly elevated. This pattern is most suggestive of:

Accepted Answer

Alcoholic liver disease

Answer

Viral hepatitis

Answer

Cholestatic liver injury

Answer

Non-alcoholic fatty liver disease

Question 6

Which of the following pre-analytical errors is most likely to cause a falsely elevated potassium level?

Accepted Answer

Hemolysis

Answer

Icterus

Answer

Using a gray-top tube

Answer

Delay in centrifugation

A patient sample is received in the lab with a milky, turbid appearance.This characteristic, known as lipemia, is most likely to interfere with which of the following?

A patient sample is received in the lab with a milky, turbid appearance.
This characteristic, known as lipemia, is most likely to interfere with which of the following?