Free DHA Hematology Laboratory mock test

12 original exam-style questions from our Hematology Laboratory bank, timed at the exam’s own pace, scored against the 55% DHA pass mark. They span 7 of the 8 blueprint domains, so you will see exactly where you are weakest - free, no sign-up.

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Sit 12 original exam-style questions at real exam pace

These are 12 original questions taken from our Hematology Laboratory bank, spread across 7 of the 8 domains of the published blueprint. You get 72 seconds per question, which is exactly the pace of the real MTH4612 exam (14 minutes for 12). At the end you will see which domains you are weakest in, and the full worked reasoning for every question.

12: questions
14:24: time limit
55%: DHA pass mark

A short diagnostic cannot predict whether you will pass - only the real exam does that. It will show you, honestly, where you currently stand.

What the real Hematology Laboratory licensing exam looks like

Candidates for a Hematology Laboratory licence in the UAE sit a computer-based multiple-choice examination - DHA exam code MTH4612, delivered through Prometric for DHA, MOHAP and SHA, and through Pearson VUE for DOH Abu Dhabi. The DHA pass mark is 55% (DHA CBT Guideline, Sep 2026); other authorities set their own, so confirm yours before booking. The result is reported to you as pass or fail only - your score is never released.

Pass marks at a glance: DHA exam codes and pass marks for all written exams in one sourced table.

The paper is built to a published blueprint, which is why a domain-by-domain diagnostic is more useful than a raw percentage. Your questions above were drawn from across Automation, Flow Cytometry and Quality Control, Haematopoiesis and Blood Cell Morphology, Red Cell Disorders and Anaemia, Special Haematology Tests and 3 more - the same areas the real paper weights.

Before you can book the exam at all you need Dataflow primary source verification of your degree, licence and experience, which typically runs several weeks. Candidates routinely underestimate this and end up sitting the exam sooner after study than they planned. Check where you stand with our free eligibility checker or confirm whether your title even requires an exam using the Prometric exam checker.

You get three attempts in total across all UAE authorities - not three each - under the Unified Professional Qualification Requirements. At roughly AED 880 per attempt, plus the licensing delay each failure adds to your visa and start date, the cost of going in underprepared is not really the exam fee.

What is on the Hematology Laboratory exam: the full blueprint

The published blueprint splits into 8 domains and 50 testable sub-topics. The diagnostic above samples across them, which is why its breakdown maps onto the structure the real paper is built from.

Haematopoiesis and Blood Cell Morphology~12%6 topics
Red Cell Disorders and Anaemia~18%7 topics
Haemoglobinopathies and Thalassaemias~10%6 topics
White Cell Disorders and Haematological Malignancy~15%7 topics
Haemostasis and Coagulation~18%8 topics
Automation, Flow Cytometry and Quality Control~12%6 topics
Specimen Handling, Laboratory Safety and Ethics~8%5 topics
Special Haematology Tests~7%5 topics

Questions: 150 multiple-choice (DHA MTH4612)
Duration: 3 hours, including registration
DHA pass mark: 55% - reported as pass or fail only

Figures for the DHA exam, from the DHA CBT Guideline, Sep 2026. DOH, MOHAP, SCFHS, QCHP, NHRA and OMSB set their own length, timing and pass mark. See the DHA exam guide and pass marks for every DHA exam.

A worked Hematology Laboratory exam question

Every question in the diagnostic and in the paid bank is written to this standard: a clinical stem, four plausible options and the reasoning for the answer, with its source.

Automation, Flow Cytometry and Quality Control

In the impedance method used by many haematology analysers, how are cells counted and sized?

ALight absorbance of a lysed blood sample
BResistance pulses as cells pass an apertureCorrect
CFluorescence of nucleic acid dyes alone
DVisual comparison with a standard film

Why: In the Coulter impedance principle, each cell passing through an aperture causes a pulse in electrical resistance proportional to its volume, allowing counting and sizing. Light absorbance of lysed blood is used to measure haemoglobin, not to count cells.

Source: Dacie and Lewis Practical Haematology, 12th ed.

Hematology Laboratory sample questions with answers

4 more original exam-style Hematology Laboratory questions, worked in full. They are not real or recalled exam questions, and none of them is in the diagnostic above, so sit that first if you have not.

Question 1 · Automation, Flow Cytometry and Quality Control
Two consecutive results of the same control level both exceed +2 SD from the mean. Which Westgard rule is violated and what type of error does it suggest?
1. A1-2s, a warning only
2. BR-4s, random error
3. C2-2s, systematic error
4. D10x, imprecision
Show answer and explanation
Correct answer: C. 2-2s, systematic error
The 2-2s rule is violated when two consecutive control results exceed the same 2 SD limit, indicating systematic error, and the run should be rejected and investigated. R-4s detects random error when results within a run differ by more than 4 SD.
Reference: Westgard JO et al. Clin Chem 1981 (multirule QC)
Question 2 · Haemostasis and Coagulation
An older woman with new extensive bruising has an isolated prolonged APTT. An immediate 1:1 mix corrects, but after 2 hours at 37 C the mixed APTT is prolonged again. What is the most likely cause?
1. AFactor XII deficiency
2. BAcquired factor VIII inhibitor
3. CLupus anticoagulant
4. DVitamin K deficiency
Show answer and explanation
Correct answer: B. Acquired factor VIII inhibitor
Acquired factor VIII autoantibodies are typically time and temperature dependent, so correction is seen immediately but lost after incubation. A lupus anticoagulant usually fails to correct immediately, and factor XII deficiency does not cause bleeding.
Reference: Tiede A et al. International Recommendations on Acquired Hemophilia A, Haematologica 2020
Question 3 · Haemostasis and Coagulation
A patient's PT is 18 seconds, the mean normal PT is 12 seconds and the thromboplastin ISI is 2.0. What is the INR?
1. A1.5
2. B3.0
3. C3.5
4. D2.25
Show answer and explanation
Correct answer: D. 2.25
INR = (patient PT / mean normal PT) to the power of ISI = (18 / 12)^2.0 = 1.5^2 = 2.25. Multiplying the ratio by the ISI instead of raising it to that power gives the incorrect value of 3.0.
Reference: WHO Guidelines for Thromboplastins and Plasma Used to Control Oral Anticoagulant Therapy 2013
Question 4 · Haemoglobinopathies and Thalassaemias
A 24-year-old has Hb 118 g/L, MCV 63 fL, normal ferritin and an HbA2 of 5.2% by HPLC. What is the most likely diagnosis?
1. ABeta-thalassaemia trait
2. BIron deficiency anaemia
3. CAlpha-thalassaemia trait
4. DSickle cell trait
Show answer and explanation
Correct answer: A. Beta-thalassaemia trait
Marked microcytosis with normal iron stores and an HbA2 above 3.5% is diagnostic of beta-thalassaemia trait. Alpha-thalassaemia trait has a normal or low HbA2 and requires DNA analysis for confirmation.
Reference: BSH Guideline: Significant Haemoglobinopathies, Laboratory Diagnosis 2023

Last reviewed September 2026. About these questions: every item is original, written to the published blueprint, with a rationale and a reference, and no recalled or leaked exam content is used. How we write our questions.

How to use this diagnostic properly

1Sit it cold, once. Do not look anything up. A diagnostic you help yourself through tells you nothing. The number you get is only useful if it is honest.
2Read every rationale - especially the ones you got right. Getting a question right by elimination is not the same as knowing it. The worked reasoning is free above, whether or not you buy anything.
3Work weakest domain first. The breakdown orders your domains worst-first for exactly this reason. Studying what you are already good at feels productive and moves nothing.
4Re-sit under full exam conditions later. The real paper is far longer than this and stamina matters. Full-length timed papers are what the paid bank is for.

Frequently asked questions

Is this Hematology Laboratory mock exam really free?

Yes. All 12 questions, your score, the domain breakdown and the full worked answers are free, with no sign-up and no email required. The paid bank is a separate, much larger set of 450 questions.

Are these real Hematology Laboratory exam questions?

No. They are original questions written to the official Hematology Laboratory blueprint and drawn from our full bank - not leaked or recalled items, which would breach exam security and are frequently out of date. They follow the exam's format and domain weighting.

What is the pass mark for the Hematology Laboratory exam?

55% for the DHA Hematology Laboratory exam (MTH4612), as published in the DHA CBT Guideline, Sep 2026. Other authorities set their own pass marks, so confirm yours before booking. DHA reports only pass or fail - your actual score is never released to you, which is why a diagnostic like this is useful for seeing where you stand.

Does passing this mock mean I will pass the real exam?

No, and we will not claim otherwise. 12 questions cannot predict a full-length paper. What it does reliably show is which blueprint domains you are currently weakest in.

How many attempts do I get at the real exam?

Three in total across all UAE authorities under the Unified Professional Qualification Requirements - not three per authority. Each attempt costs roughly AED 880.

What topics does the Hematology Laboratory exam cover?

The published blueprint splits into 8 domains covering 50 testable sub-topics: Haematopoiesis and Blood Cell Morphology, Red Cell Disorders and Anaemia, Haemoglobinopathies and Thalassaemias, White Cell Disorders and Haematological Malignancy, Haemostasis and Coagulation, Automation, Flow Cytometry and Quality Control, Specimen Handling, Laboratory Safety and Ethics, Special Haematology Tests. The full weighting table is on this page.

How long is the Hematology Laboratory exam and how many questions?

The DHA Hematology Laboratory exam (MTH4612) is 150 multiple-choice questions in 3 hours, including registration and the introduction, as published in the DHA CBT Guideline, Sep 2026. Other authorities set their own length and timing, so confirm theirs in the current candidate bulletin.

Do I need to create an account to take this mock exam?

No. There is no sign-up, no email capture and no payment. The questions, your score, the domain breakdown and the full worked answers are all free, and nothing is held back behind a form.