100+ Free MLT Practice Questions

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Question 1

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Which acid-base disorder produces a low pH and low bicarbonate (HCO3) with compensatory low pCO2?

Respiratory alkalosis

Metabolic alkalosis

Metabolic acidosis

Respiratory acidosis

to track

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Key Facts: MLT Exam

100

CAT Items

Computer-adaptive testing

2.5 hrs

Exam Time

AMT

$225

Exam Fee

AMT

Pearson VUE

Test Centers

CAT delivery

AMT MLT is the associate-level generalist clinical lab technician credential. 100 items computer-adaptive, 2.5 hours, $225. Master order of draw, hemolysis interferences (raises K/LDH/AST/PO4), Westgard 1-3s rejection, ABO front/back typing, RhoGAM dosing, and component shelf life (PRBC 42d AS-1, platelets 5d 20-24°C).

Sample MLT Practice Questions

Try these sample questions to test your MLT exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which blood collection tube contains EDTA and is used for CBC testing?

A.Light blue top

B.Lavender top

C.Green top

D.Gray top

Explanation: Lavender (purple) top tubes contain EDTA, a chelating anticoagulant that preserves cellular morphology, making them ideal for CBC and other hematology testing.

2According to CLSI order of draw, which tube is collected immediately after the light blue (citrate) tube?

A.Lavender (EDTA)

B.Gray (fluoride)

C.Red or gold/SST

D.Green (heparin)

Explanation: The CLSI order of draw is: blood culture, light blue (citrate), red/SST, green (heparin), lavender (EDTA), then gray (fluoride). Red or SST follows the light blue.

3A hemolyzed specimen will MOST falsely elevate which analyte?

A.Sodium

B.Potassium

C.Chloride

D.Calcium

Explanation: Potassium is highly concentrated inside red blood cells (~150 mEq/L). Hemolysis releases intracellular potassium into serum, causing falsely elevated results.

4Which Westgard rule signals that a control run should be REJECTED?

A.1-2s

B.1-3s

C.R-1s

D.Mean shift

Explanation: The 1-3s Westgard rule (one control exceeding the mean by 3 SD) is a rejection rule indicating a significant random error in the run.

5A potassium result of 6.8 mEq/L in a non-hemolyzed sample is reported. What action is required?

A.Repeat in 24 hours

B.Notify physician immediately as a critical value

C.Hold and confirm with another lab

D.Report and chart only

Explanation: Potassium >6.0 mEq/L is a critical value that requires immediate notification of the physician because hyperkalemia can cause cardiac arrhythmias.

6A fasting plasma glucose of 132 mg/dL on two separate occasions meets the diagnostic criteria for which condition?

A.Impaired fasting glucose

B.Diabetes mellitus

C.Hypoglycemia

D.Normal

Explanation: Diabetes is diagnosed when fasting plasma glucose is 126 mg/dL or greater on two occasions. 132 mg/dL meets this threshold.

7Which HbA1c result is consistent with a diagnosis of diabetes mellitus?

A.5.0%

B.5.7%

C.6.2%

D.7.0%

Explanation: An HbA1c of 6.5% or greater is diagnostic for diabetes. 7.0% clearly meets this criterion.

8Which enzyme is most specific for myocardial injury?

A.AST

B.LDH

C.Cardiac troponin I

D.Total CK

Explanation: Cardiac troponin I (cTnI) is highly specific for myocardial cell injury and is the gold-standard marker for acute MI.

9A patient has the following ABO results: forward type shows agglutination with anti-A only; reverse type shows agglutination with B cells only. What is the patient's blood type?

A.Type O

B.Type A

C.Type B

D.Type AB

Explanation: Patient red cells reacting with anti-A indicates A antigen present. Serum reacting with B cells confirms anti-B in serum. Both findings = type A.

10An Rh-negative mother delivers an Rh-positive baby. What is the standard postpartum dose of RhoGAM?

A.50 µg IM

B.150 µg IM

C.300 µg IM

D.1,000 µg IM

Explanation: A standard 300 µg IM dose of RhoGAM (Rh immune globulin) covers up to 30 mL of fetal whole blood (15 mL of RBCs) and is given within 72 hours of delivery.

About the MLT Exam

AMT associate-level clinical laboratory technician credential. Generalist coverage of blood banking, chemistry, hematology, microbiology, urinalysis/body fluids, immunology/serology, and lab operations. Parallel to ASCP MLT. Computer-adaptive testing via Pearson VUE.

Questions

100 scored questions

Time Limit

2.5 hours

Passing Score

Scaled (AMT-set)

Exam Fee

$225 (AMT)

MLT Exam Content Outline

20%

Chemistry

Glucose, electrolytes, BUN/Cr, enzymes, lipids, hormones, hemolysis interferences

20%

Hematology

CBC, smear, anemias, leukemias, indices (MCV/MCH/MCHC), rule of 3

20%

Microbiology

Gram stain, culture media, Strep/Staph/E. coli ID, susceptibility, parasites, fungi

18%

Blood Banking

ABO/Rh, antibody screen, crossmatch, transfusion reactions, components, RhoGAM

Urinalysis / Body Fluids

Sediment, casts (hyaline/RBC/WBC/waxy), specific gravity, body fluid cell counts

Immunology / Serology

ANA, hepatitis serology, HIV 4th gen, syphilis testing

Lab Operations

Westgard QC, CLIA waived/moderate/high, safety (BBP, sharps), LIS, specimen processing

How to Pass the MLT Exam

What You Need to Know

Passing score: Scaled (AMT-set)
Exam length: 100 questions
Time limit: 2.5 hours
Exam fee: $225

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

MLT Study Tips from Top Performers

1Master the CLSI order of draw and the consequences of incorrect order (cross-contamination)

2Memorize hemolysis interferences: raises K, LDH, AST, PO4; lowers Na (dilution)

3Drill ABO front/back typing and discrepancies (weak A subgroup, BMT chimera)

4Apply Rule of 3 (HCT ≈ 3× HGB; HGB ≈ 3× RBC) as a quick CBC sanity check

5Know component shelf life: PRBC 42d AS-1, FFP 1y frozen / 24h thawed, platelets 5d at 20-24°C with agitation

Frequently Asked Questions

What is the standard order of draw?

CLSI order of draw (preventing tube cross-contamination): yellow (blood culture, sterile) → light blue (citrate, coag) → red/gold SST (no/clot activator) → green (heparin, chemistry) → lavender (EDTA, hematology) → gray (fluoride/oxalate, glucose). Mnemonic: "Stop Light Red Stay Put Light Green" or learn the citrate-FIRST rule for coag specimens.

How does hemolysis affect lab results?

Hemolysis (RBC lysis) releases intracellular contents — falsely ELEVATES potassium (most clinically critical), LDH, AST, magnesium, phosphate, ammonia. Falsely LOWERS sodium (dilution), HCO3, glucose (delayed glycolysis). Causes: difficult draw, butterfly with vacuum tube, pneumatic tube system, vigorous mixing. Always note hemolysis on report; redraw if grossly hemolyzed.

What is RhoGAM and when is it given?

RhoGAM (anti-D immune globulin) prevents Rh sensitization in Rh-negative mothers carrying Rh-positive babies. Standard dose: 300 µg IM at 28 weeks gestation AND within 72 hours postpartum (covers ~30 mL whole blood / 15 mL fetal RBCs). Also given after miscarriage, ectopic, amniocentesis, abdominal trauma. Kleihauer-Betke test quantifies fetomaternal hemorrhage to guide additional doses.

How should I study for AMT MLT?

Plan 80-140 hours over 12-16 weeks. AMT MLT is computer-adaptive — you cannot skip and return to questions. Focus weighted study on the four big domains (chemistry, hematology, microbiology, blood banking — together ~78% of exam). Master order of draw, hemolysis interferences, Westgard QC, ABO typing including discrepancies, and Strep/Staph identification. AMT MLT and ASCP MLT have substantial content overlap.