Prometric Exam Questions for Anatomic Pathology Specialists 2026: 20 MCQs with Answers on Specimen Handling, Frozen Sections, Immunohistochemistry, Breast, GI, Lung, Thyroid, Lymphoma and Skin Pathology, Cytology, Molecular Testing and Laboratory Quality

The specialist anatomic pathology paper (HIS5571 at DHA, with HEM4711 for haematopathology and MIC5251 for medical microbiology as separate titles, and the equivalent SCFHS, QCHP and NHRA papers) is 100 to 150 single-best-answer questions in up to three hours with a pass mark of about 60%. Candidates with an MD, DNB, FCPS, FRCPath or Arab Board in histopathology sit it after the authority confirms the title. Gulf pathology services are consolidating into accredited reference laboratories, and the paper reflects a modern practice: synoptic reporting, immunohistochemistry and molecular testing, cytology classification systems and laboratory quality. This set covers what recurs. The licensing route for all laboratory physician titles is in the pathologist guide.

Specimen handling and intraoperative consultation

Question 1

Which statement about tissue fixation for routine histology and ancillary testing is correct?

1. Fixation time does not affect immunohistochemistry
2. 10% neutral buffered formalin at a volume of at least 10 times the specimen, with a cold ischaemia time of under one hour and fixation of 6 to 72 hours for breast specimens tested for ER, PR and HER2, because under- and over-fixation alter antigenicity and nucleic acid quality; large specimens are sliced to allow penetration (about 1 mm per hour)
3. Alcohol is the standard fixative for routine histology
4. Specimens should be frozen before formalin fixation

Answer: B. ASCO/CAP guidelines specify pre-analytic requirements for breast biomarkers, and accreditation inspections check them.

Question 2

A surgeon requests a frozen section. Which request is an appropriate use of intraoperative consultation?

1. Definitive grading of a lymphoma
2. Assessment of surgical margins, confirmation that lesional tissue adequate for diagnosis has been sampled, determination of the nature of a lesion when it will change the operation (for example benign versus malignant in a lung nodule or pancreatic mass), and sentinel node assessment where policy allows; frozen sections are avoided for lymphoma classification, small specimens needed in their entirety and lesions where freezing artefact would compromise diagnosis
3. Diagnosis of a 2 mm skin biopsy
4. Any case the surgeon is curious about

Answer: B. Frozen section accuracy is about 95 to 98%; deferral to permanent sections is an acceptable answer and the discordance rate is a tracked quality indicator.

Question 3

Two breast core biopsies from different patients are received in the same container with one request form. The correct action is:

1. Process both and report the one that matches the clinical details
2. Reject or quarantine the specimen as unidentifiable, notify the submitting clinician immediately, document the incident, and request re-biopsy where the specimens cannot be unambiguously attributed; patient identification errors are never resolved by guesswork
3. Process both and issue a combined report
4. Discard both quietly

Answer: B. Specimen identification is the first laboratory patient safety goal; two identifiers on container and form are required, and mismatches are tracked as quality events.

Immunohistochemistry and tumours of unknown primary

Question 4

A liver biopsy shows metastatic adenocarcinoma that is CK7 positive, CK20 negative, TTF-1 positive and napsin A positive. The most likely primary is:

1. Colorectal
2. Lung adenocarcinoma, for which the CK7+/CK20−/TTF-1+ profile is characteristic; colorectal carcinoma is typically CK20+/CDX2+/CK7−, and TTF-1 also stains thyroid carcinoma (with thyroglobulin and PAX8) and some neuroendocrine tumours
3. Prostate
4. Hepatocellular carcinoma

Answer: B. A stepwise panel approach (lineage, then organ-specific markers such as GATA3 for breast and urothelium, PAX8 for kidney, ovary and thyroid, NKX3.1 for prostate) is the tested method; molecular profiling supplements it.

Question 5

A breast carcinoma shows HER2 immunohistochemistry with weak to moderate complete membrane staining in more than 10% of cells. The score and the next step are:

1. Score 3+, HER2 positive; no further testing
2. Score 2+ (equivocal), requiring reflex in situ hybridisation (FISH or dual ISH) to determine HER2 gene amplification, reported with ratio and copy number per ASCO/CAP criteria; 0 and 1+ are negative (with "HER2-low" now reported because it predicts benefit from antibody-drug conjugates) and 3+ (strong complete staining in over 10%) is positive
3. Score 1+, negative
4. Score 0, negative

Answer: B. Oestrogen receptor is reported as positive at 1% or more nuclear staining, with "low positive" for 1 to 10%; Ki-67 and grade complete the prognostic panel.

Question 6

Which elements are required in a synoptic report of an invasive breast carcinoma resection?

1. A free-text description only
2. Histological type, Nottingham grade (tubules, nuclear pleomorphism, mitoses), tumour size, margin status with distances, lymphovascular invasion, in situ component and its extent, lymph node status with number examined and involved and size of deposits, biomarker results (ER, PR, HER2, Ki-67), treatment effect if neoadjuvant therapy was given, and pathological TNM stage, using a structured template (CAP or ICCR)
3. Tumour size alone
4. Lymph node status alone

Answer: B. Synoptic reporting improves completeness and is required by accreditation programmes used across the Gulf (CAP, JCI, ISO 15189).

Gastrointestinal and pulmonary pathology

Question 7

A colonic polyp shows a serrated architecture with crypt dilatation and horizontal branching at the base, located in the right colon, measuring 12 mm, without cytological dysplasia. The diagnosis and significance are:

1. Hyperplastic polyp; no follow-up
2. Sessile serrated lesion (sessile serrated adenoma/polyp), a precursor of microsatellite-unstable, BRAF-mutated colorectal cancer through the serrated pathway, requiring complete excision and surveillance colonoscopy; the presence of dysplasia upgrades urgency
3. Traditional serrated adenoma
4. Juvenile polyp

Answer: B. Conventional adenomas progress via APC and KRAS; the WHO 2019 classification standardised serrated terminology.

Question 8

A colorectal carcinoma resection shows loss of MLH1 and PMS2 on immunohistochemistry. The next steps and interpretation are:

1. Diagnose Lynch syndrome immediately
2. Test for BRAF V600E mutation and/or MLH1 promoter hypermethylation: their presence indicates a sporadic tumour, whereas their absence raises suspicion of Lynch syndrome and prompts germline testing with genetic counselling; mismatch repair deficiency also predicts response to immune checkpoint inhibitors and is now tested universally in colorectal cancer
3. No further action
4. Repeat the stains only

Answer: B. Isolated loss of MSH2/MSH6 or PMS2 alone points more directly to Lynch syndrome; consanguinity in Gulf populations makes hereditary cancer syndromes a recurring theme.

Question 9

A gastric biopsy shows chronic active gastritis with spiral organisms in the surface mucus, intestinal metaplasia and a lymphoid infiltrate with lymphoepithelial lesions. The findings suggest:

1. Autoimmune gastritis only
2. Helicobacter pylori gastritis with intestinal metaplasia (a precursor of intestinal-type gastric cancer requiring surveillance per the OLGA/OLGIM staging), and lymphoepithelial lesions raising the possibility of extranodal marginal zone (MALT) lymphoma, which needs immunohistochemistry (CD20, CD3, CD5, CD10, cyclin D1), clonality studies and H. pylori eradication as first-line treatment for early-stage lymphoma
3. Reflux gastritis
4. Normal mucosa

Answer: B. The Sydney system standardises gastritis reporting; MALT lymphoma regresses after eradication in most t(11;18)-negative cases.

Question 10

A lung resection shows a 3 cm adenocarcinoma with predominantly acinar pattern. Which ancillary tests are required for a patient who may receive systemic therapy?

1. No molecular testing is needed in resected disease
2. Molecular testing for EGFR, ALK, ROS1, BRAF, KRAS G12C, MET exon 14, RET and NTRK alterations, and PD-L1 immunohistochemistry, with tissue conserved for next-generation sequencing; EGFR status now informs adjuvant therapy, and the pathologist's role includes reporting the predominant and secondary patterns, spread through air spaces and the 8th edition T category based on invasive size
3. HER2 testing only
4. Culture for tuberculosis only

Answer: B. Tissue stewardship (minimising levels cut, conserving blocks) is a tested professional responsibility; cytology cell blocks are acceptable for most molecular assays.

Endocrine, gynaecological and cytology

Question 11

A thyroid fine-needle aspirate shows a cellular sample with microfollicles, scant colloid and nuclear crowding without papillary nuclear features. Under the Bethesda System for Reporting Thyroid Cytopathology this is:

1. Category II, benign
2. Category IV, follicular neoplasm (or suspicious for a follicular neoplasm), with a malignancy risk of about 25 to 40%, for which molecular testing or diagnostic lobectomy is recommended, because follicular carcinoma cannot be distinguished from adenoma on cytology (capsular and vascular invasion require histology)
3. Category VI, malignant
4. Category I, non-diagnostic

Answer: B. Bethesda III (atypia of undetermined significance) carries a 10 to 30% risk and is managed by repeat aspiration or molecular testing; papillary carcinoma shows nuclear grooves, pseudoinclusions and powdery chromatin.

Question 12

A cervical liquid-based cytology sample shows cells with high nuclear-to-cytoplasmic ratios, hyperchromatic irregular nuclei and scant cytoplasm in small clusters, and the HPV co-test is positive for HPV 16. The Bethesda category and management are:

1. Negative for intraepithelial lesion; routine screening
2. High-grade squamous intraepithelial lesion (HSIL) with high-risk HPV; immediate referral for colposcopy and biopsy, where CIN2/3 is treated by excision (LEEP) or ablation, with the p16/Ki-67 immunostain useful on biopsies to confirm high-grade disease
3. ASC-US; repeat in three years
4. Atrophy; oestrogen cream

Answer: B. Gulf states are adopting primary HPV screening and HPV vaccination programmes; the Bethesda 2014 terminology and the WHO two-tier LSIL/HSIL scheme are the standards.

Question 13

An endometrial biopsy from a 55-year-old with postmenopausal bleeding shows crowded glands with complex architecture, nuclear atypia and loss of polarity but no stromal invasion. The diagnosis and risk are:

1. Proliferative endometrium
2. Atypical hyperplasia / endometrioid intraepithelial neoplasia, which carries a substantial risk of concurrent or subsequent endometrioid carcinoma (around 25 to 40% concurrent carcinoma at hysterectomy), so hysterectomy is usually recommended in postmenopausal women, with progestin therapy for those wishing to preserve fertility
3. Disordered proliferative endometrium
4. Endometrial polyp

Answer: B. Molecular classification of endometrial carcinoma (POLE-mutated, mismatch repair-deficient, p53-abnormal, no specific molecular profile) now guides adjuvant therapy, and obesity-driven endometrial cancer is rising in the Gulf.

Haematolymphoid and skin

Question 14

A 60-year-old has a lymph node showing effacement by small lymphocytes positive for CD20, CD5 and CD23, negative for cyclin D1 and CD10, with proliferation centres. The diagnosis is:

1. Mantle cell lymphoma
2. Chronic lymphocytic leukaemia / small lymphocytic lymphoma, distinguished from mantle cell lymphoma (CD5+, CD23−, cyclin D1+, SOX11+, t(11;14)) and follicular lymphoma (CD10+, BCL6+, BCL2+ follicles, t(14;18)); flow cytometry, immunohistochemistry and cytogenetics are integrated per the WHO classification
3. Follicular lymphoma
4. Reactive hyperplasia

Answer: B. Lymph nodes for suspected lymphoma are sent fresh (not in formalin) to allow flow cytometry and cytogenetics; excision biopsy is preferred over needle cores for primary diagnosis.

Question 15

Which features must be reported for a primary cutaneous melanoma excision?

1. Diameter and colour only
2. Breslow thickness (the strongest prognostic factor), ulceration, mitotic rate per mm², margins, microsatellites, lymphovascular and perineural invasion, tumour-infiltrating lymphocytes, regression, histological subtype, Clark level optionally, and sentinel node status where performed, with BRAF testing for advanced disease, using a synoptic template and AJCC 8th edition staging
3. Clark level alone
4. Presence of pigment

Answer: B. Ulceration upstages the T category; immunohistochemistry (SOX10, Melan-A, PRAME) helps distinguish melanoma from naevi and other spindle cell lesions.

Question 16

A 35-year-old has a 6 cm deep thigh mass. Core biopsy shows a spindle cell neoplasm with herringbone architecture, atypia and mitoses. The pathologist's approach should include:

1. Diagnose "sarcoma" and stop
2. A systematic immunohistochemical panel to exclude mimics (cytokeratins and p63 for sarcomatoid carcinoma, S100 and SOX10 for melanoma, desmin and myogenin for rhabdomyosarcoma, CD34, STAT6 for solitary fibrous tumour, MDM2 for dedifferentiated liposarcoma), molecular testing for characteristic translocations (for example SS18::SSX in synovial sarcoma), grading by the FNCLCC system, and discussion at a sarcoma multidisciplinary meeting before definitive surgery
3. Frozen section for grading
4. Culture for tuberculosis

Answer: B. Sarcomas are referred to specialist centres; an unplanned excision before diagnosis worsens outcome, and the pathologist's role is to prevent it.

Perinatal, autopsy and laboratory practice

Question 17

A placenta is submitted after an unexplained stillbirth at 36 weeks. Which findings is the pathologist expected to assess and report?

1. Weight only
2. Placental weight relative to gestational age, cord insertion and coiling, membranes, maternal vascular malperfusion (infarcts, accelerated villous maturation, decidual arteriopathy), fetal vascular malperfusion (thrombosis, avascular villi), chorioamnionitis and funisitis with staging and grading, villitis of unknown aetiology, chronic histiocytic intervillositis, massive perivillous fibrin deposition and meconium changes, using the Amsterdam consensus terminology, correlated with the clinical history
3. Presence of calcification only
4. Nothing; placentas are not examined

Answer: B. Placental examination explains a large share of stillbirths and informs the next pregnancy; Gulf authorities have standardised perinatal death review.

Question 18

A hospital requests a clinical (consented) autopsy on a patient who died unexpectedly after surgery. Which statement about autopsy practice in the Gulf is correct?

1. Autopsy can proceed on the pathologist's decision alone
2. Unexpected or unnatural deaths, deaths related to medical procedures under investigation and deaths in custody fall under the medicolegal (forensic) system and must be reported to the authorities before any examination; a clinical autopsy requires valid consent from the legally authorised next of kin and respect for religious requirements, including prompt release of the body for burial, and it is relatively uncommon in the region
3. Religious objections never apply
4. Consent is not required for hospital autopsies

Answer: B. Death certification, notification of reportable deaths and tissue retention rules are tested; minimally invasive and imaging autopsies are increasingly used where consent is limited.

Question 19

Which quality indicators does an accredited anatomic pathology laboratory monitor?

1. Only the number of cases signed out
2. Turnaround times for biopsies and resections, frozen section to permanent section discordance, intradepartmental and interinstitutional second-opinion discrepancy rates, specimen identification and labelling errors, amended report rates, immunohistochemistry control performance and external quality assurance participation, cytology-histology correlation (for example for cervical and thyroid cytology), and critical and unexpected diagnosis communication within defined times
3. Block and slide counts only
4. Staff attendance

Answer: B. CAP and ISO 15189 accreditation, mandated by Gulf authorities for most hospital laboratories, require documented quality management and competency assessment.

Question 20

A biopsy reported as benign three weeks ago is reviewed for a conference and found to contain a focus of invasive carcinoma. The pathologist should:

1. Do nothing because the report was already issued
2. Issue an amended (corrected) report promptly, communicate the significant unexpected change directly to the treating clinician and document the communication (an unexpected malignancy is treated as a critical diagnosis), record the event in the quality system and participate in root cause analysis without blame, in line with the laboratory's policy and the authority's duty-of-candour expectations
3. Change the original report silently
4. Wait for the clinician to ask

Answer: B. Amended reports must preserve the original text and state what changed and why; concealment of errors is professional misconduct under Gulf licensing codes.

How to practise

• Learn the classification and reporting systems: WHO tumour classifications, Bethesda thyroid and cervical systems, ASCO/CAP biomarker criteria, AJCC 8th edition, Amsterdam placental criteria.
• Know the immunohistochemistry panels for unknown primary, lymphoma and spindle cell lesions, and the molecular tests that change treatment.
• Know the laboratory practice rules: fixation, identification, frozen sections, critical diagnoses, amended reports, accreditation indicators.
• Practise under time in the Anatomic Pathology bank, with the Haematopathology bank or Medical Microbiology bank for those titles, using the error-log method.

Related reading: laboratory scientist titles, lab technologist questions and oncology questions.

Frequently asked questions

How many questions are in the Prometric anatomic pathology specialist exam?

Typically 100 to 150 single-best-answer MCQs in up to three hours, with a pass mark of about 60%, varying by authority.

Which pathology topics come up most?

Breast, gastrointestinal, lung, thyroid and gynaecological pathology with their biomarkers and classification systems, lymphoma work-up, cytology categories, frozen sections and laboratory quality.

Does the exam include images?

Yes. Expect photomicrographs of common tumours, immunohistochemistry patterns and cytology, with questions on the next step rather than pure pattern recognition.

Are haematopathology and microbiology separate exams?

Yes. They are separate titles with their own papers at most authorities; a general pathology paper covers all areas where the authority uses one.

Are these real exam questions?

No. They are original practice questions written to the published blueprint. Real exam content is confidential.