AUB & Menstrual Disorders: Clinical Case Studies & Reasoning Guide for iHuman, OSCE & Board Exam Preparation

DOCUMENT DESCRIPTION Overview This is Module 2 of a three-module comprehensive academic study packet on Abnormal Uterine Bleeding and Menstrual Disorders in Reproductive-Age Women. The module is an original educational work authored by Brian Kabinga, designed specifically for medical students, nursing students, nurse practitioner students, and physician assistant students preparing for high-stakes standardized clinical examinations including USMLE Step 2 CK, ANCC certification, AANP certification, PANCE/PANRE, and iHuman standardized patient encounter platforms. The module spans 18 professionally formatted pages and contains two complete, full-length patient encounter simulations written in iHuman and OSCE format, followed by comprehensive expert answer breakdowns and grading rubrics for all sixteen self-assessment questions. Every patient scenario, clinical reasoning framework, question stem, answer rationale, and teaching commentary in this document is an original educational composition created for academic examination preparation purposes. This module is particularly valuable because abnormal uterine bleeding simultaneously demands knowledge across endocrinology, hematology, reproductive medicine, surgical gynecology, oncology, and pharmacology — making it one of the highest-complexity and most frequently examined gynecology topics on every major clinical examination platform. CASE STUDY 1 — Amara Osei, 34-Year-Old Female: Heavy Menstrual Bleeding, Uterine Fibroids, and Coagulopathy Differentiation (Pages 1–6) The Patient Amara Osei is a 34-year-old Black female professional presenting with a six-month history of progressively worsening heavy menstrual bleeding that has dramatically impacted her professional and social functioning. She reports soaking through a super-absorbency pad within 45 to 60 minutes at her heaviest, passing golf-ball-sized clots, experiencing flooding episodes that soak through clothing, and setting a nightly alarm to change pads. She describes her energy as 3 out of 10 and reports new dyspnea on climbing one flight of stairs, occasional palpitations at rest, persistent pelvic pressure and heaviness throughout the month, and significantly increased urinary frequency with nocturia twice nightly. Vital Signs and General Findings Vital signs reveal a heart rate of 96 bpm at the high-normal range, blood pressure of 118/76, and BMI of 29.8. General appearance reveals pale conjunctivae bilaterally, a sallow complexion, and visibly reduced energy. Physical Examination Highlights The physical examination delivers multiple high-yield teaching findings across every system. Integumentary examination reveals pale conjunctivae, pallor of the palmar creases, and bilateral koilonychia — the classic spoon-shaped nail deformity pathognomonic for severe chronic iron deficiency. Cardiovascular examination reveals a soft grade II/VI systolic ejection murmur at the left sternal border — attributed to the high-output cardiac state generated by the body's compensatory response to a hemoglobin of 8.4 g/dL, not a valvular lesion. Abdominal examination reveals a palpable firm midline mass extending 2 to 3 cm above the pubic symphysis with percussion dullness — corresponding to a 14-week-size fibroid uterus. Bimanual examination documents a markedly enlarged, irregular, lobulated, freely mobile uterus with multiple discrete firm nodules on the surface and fundus — the pathognomonic bimanual finding of multiple uterine leiomyomata. Adnexal examination is unremarkable with no cervical motion tenderness, effectively excluding concurrent pelvic inflammatory pathology. Diagnostic Results The diagnostic workup delivers a complete teaching set. Hemoglobin returns at 8.4 g/dL (moderate anemia), hematocrit 26%, MCV 71 fL confirming the microcytic pattern of iron deficiency. Serum ferritin is critically low at 4 ng/mL with serum iron of 28 µg/dL, elevated TIBC at 498 µg/dL, and transferrin saturation of only 6% — confirming one of the most severe iron deficiency profiles in the clinical literature. Reactive thrombocytosis at 448,000/µL is identified and explained as an iron-deficiency-associated phenomenon rather than a primary platelet disorder. TSH and prolactin are normal, excluding thyroid and prolactin-driven anovulation. Coagulation screening is ordered and explained with nuanced discussion of clinical probability. Transvaginal ultrasound confirms multiple leiomyomata including a 3.2 cm submucosal fibroid classified as FIGO Type 1, a 4.8 cm intramural fundal fibroid, a 3.6 cm posterior wall intramural fibroid, and a 5.1 cm right lateral subserosal fibroid — with endometrial thickness of 7 mm appropriate for the cycle phase. Eight Self-Assessment Questions Eight scored clinical questions address the full scope of the encounter: structural versus non-structural AUB classification with evidence ranking, cycle regularity as a diagnostic tool for mechanism identification, complete anemia classification with physical examination finding attribution, stepwise fertility-sensitive management plan construction, rationale for coagulopathy screening with probability assessment, fibroid location to symptom correlation for both bleeding and urinary symptoms, management plan modification for a fertility-desiring patient, and the specific contraindication to endometrial ablation in the presence of a cavity-distorting submucosal fibroid. CASE STUDY 2 — Priya Nair, 22-Year-Old Female: Irregular Bleeding, PCOS, Metabolic Syndrome, and Endometrial Hyperplasia Risk (Pages 7–12) The Patient Priya Nair is a 22-year-old South Asian university student presenting with a three-year history of irregular menstrual cycles and a one-year history of facial hair growth and worsening acne. She reports going 45 to 90 days between periods, followed by unpredictable bleeding lasting two days to three weeks. She describes weight gain of 8 kg over three years, fatigue after carbohydrate-heavy meals, and carbohydrate cravings — a symptom pattern consistent with insulin resistance. She has a strong family history of type 2 diabetes (mother) and polycystic ovary syndrome (maternal aunt). She is not sexually active and explicitly desires future pregnancy in approximately five to six years — a fertility goal that governs every treatment decision in the case. Vital Signs and Metabolic Markers Vital signs reveal a blood pressure of 128/82 mmHg in the prehypertension range, a BMI of 27.4 (overweight), and a waist circumference of 88 cm — elevated relative to the lower metabolic syndrome threshold established for South Asian women. Physical Examination Highlights Physical examination delivers a systematic hyperandrogenism and metabolic assessment. The Ferriman-Gallwey hirsutism scoring is performed in real time, documenting scores across five androgen-sensitive body areas to reach a total score of 6, meeting the threshold for clinically significant hirsutism. Active inflammatory and comedonal acne is documented across the face, upper back, and chest — consistent with androgen-driven sebaceous gland stimulation. Androgenic alopecia with diffuse crown thinning and positive hair pull test is identified. The standout metabolic finding is acanthosis nigricans at the posterior neck and bilateral axillae — the velvety, hyperpigmented skin marker of significant insulin resistance, explained in detail with its pathophysiology and treatment implications. Thyroid examination is normal. Bimanual examination reveals a normal-size, smooth, freely mobile uterus with bilateral ovarian enlargement — smooth, non-tender ovaries estimated at 4 to 5 cm bilaterally — the clinical bimanual correlate of polycystic ovarian morphology. Diagnostic Results The diagnostic workup is extensive and precisely timed. Pregnancy is excluded first. TSH and prolactin are normal, excluding the most common systemic mimickers of anovulation. Day 3 LH returns elevated at 18.2 IU/L with FSH of 5.8 IU/L, producing an LH:FSH ratio of 3.1:1. Total testosterone is at the upper limit of the reference range confirming biochemical hyperandrogenism. DHEA-sulfate is high-normal. Anti-Müllerian hormone is markedly elevated at 8.4 ng/mL reflecting the large arrested follicle pool. The metabolic panel is striking: fasting glucose of 102 mg/dL in the impaired fasting glucose range, fasting insulin of 22 µIU/mL producing a HOMA-IR of 5.5, HbA1c of 5.9% in the pre-diabetes range, triglycerides of 198 mg/dL, and HDL of 38 mg/dL — completing a full metabolic syndrome profile. Midluteal progesterone of 0.8 ng/mL biochemically confirms anovulation. Transvaginal ultrasound reveals polycystic ovarian morphology bilaterally with 24 and 22 follicles per ovary respectively and ovarian volumes exceeding 10 mL. The endometrial thickness of 13 mm after nine weeks of amenorrhea is flagged as clinically concerning, triggering the endometrial biopsy decision discussion. Eight Self-Assessment Questions Eight scored clinical questions cover: three-criterion PCOS diagnostic framework applied with case-specific evidence, systemic condition exclusion rationale and diagnostic significance, complete insulin resistance to anovulation pathophysiological chain articulation, endometrial biopsy decision with specific clinical argument, complete fertility-preserving four-domain management plan, 17-hydroxyprogesterone timing and late-onset congenital adrenal hyperplasia differentiation, acanthosis nigricans pathophysiology and treatment priority implications, and HOMA-IR calculation with complete metabolic management plan formulation. Expert Answers and Grading Rubric Breakdowns (Pages 13–20) The final eight pages provide definitive, perfect-score answers for all sixteen self-assessment questions across both cases. Every answer is written to the depth and precision expected on iHuman encounters and OSCE standardized examinations. Key expert answer features include: A complete structural versus non-structural AUB classification of Case 1 with certainty ranking and identification of the single most definitive imaging finding. A cycle regularity analysis explaining the mechanistic diagnostic value of a predictable versus unpredictable bleeding pattern. A five-row anemia classification table separating anemia-attributable physical findings from fibroid-attributable physical findings with mechanistic explanations for each. A five-step fertility-sensitive management plan for Case 1 moving from urgent IV iron repletion through medical bridge therapy, hysteroscopic myomectomy, uterine artery embolization, and long-term LNG-IUD placement with precise sequencing rationale. A detailed endometrial ablation contraindication analysis explaining why cavity distortion from the submucosal fibroid makes ablation inappropriate in this specific patient and what the correct surgical sequence should be. A three-criterion PCOS diagnostic confirmation table for Case 2 with specific evidence for each criterion. A six-row mimicker exclusion table explaining why each condition was tested and what a different result would have meant for management. The complete five-step pathophysiological chain from insulin resistance through hyperinsulinemia, androgen excess, dysregulated hypothalamic signaling, follicular arrest, anovulation, and unopposed endometrial estrogen exposure. An endometrial biopsy clinical argument identifying four concurrent risk factors justifying biopsy in a 22-year-old. A four-domain fertility-preserving management plan addressing endometrial protection, metabolic risk reduction, hyperandrogenism treatment, and future ovulation induction strategy. Acanthosis nigricans pathophysiology with treatment priority implications. HOMA-IR calculation with complete metabolic status classification and management plan. Who This Document Is For This module is specifically designed for medical students preparing for USMLE Step 2 CK shelf examinations and clinical clerkship OSCEs, nursing and nurse practitioner students using iHuman simulation platforms and preparing for ANCC or AANP board certification, physician assistant students preparing for PANCE and PANRE gynecology content, residents rotating through obstetrics and gynecology or family medicine, and any student who has previously struggled to distinguish structural from anovulatory AUB, apply the three-criterion PCOS diagnostic framework correctly, or navigate the complex intersection of reproductive and metabolic medicine that PCOS represents. Document Design The module uses a professional academic color palette — Rose, Navy, Teal, Gold, Red, and Green — with color-coded callout boxes distinguishing learning objectives, critical clinical alerts, key examination findings, correct approach frameworks, and scoring guidance. Every page carries the module title, page number, author attribution, and an originality footer. All tables use alternating row colors for readability. The PDF was generated at professional typographic quality on US Letter sizing, designed for both digital study and high-quality printing.