12.2 Medical Terminology & Clinical Record Interpretation
Key Takeaways
- Medical terms are built from a root, an optional prefix, and a suffix, so an unfamiliar term can usually be decoded rather than memorized: hepatosplenomegaly is liver plus spleen plus enlargement.
- The suffix carries the action or condition, and the distinctions that matter forensically are narrow: -otomy is an incision, -ectomy is a removal, and -ostomy is a surgically created opening.
- A decedent's medication list is a readable medical history; furosemide with metoprolol and an implanted defibrillator describes heart failure even when no diagnosis is documented.
- Anticoagulants such as warfarin and apixaban convert minor trauma into fatal hemorrhage and must be flagged to the pathologist in any case involving a fall or head strike.
- Investigators use medical terminology to describe findings accurately but must not use diagnostic terms that assert a determination reserved to the pathologist or certifier.
12.2 Medical Terminology & Clinical Record Interpretation
The ABMDI task list requires investigators to understand basic medical terminology and disease processes as a component of Forensic and Medical Knowledge. This is not academic. An investigator who cannot read "s/p CABG x3, EF 25%, on Eliquis for AFib" cannot brief a pathologist, cannot recognize what the medications imply, and cannot ask a family the right follow-up question.
Medical terminology is decodable. Learn the construction rules and the high-yield components, and most unfamiliar terms resolve on sight.
1. Word Construction
Term = (prefix) + root + (combining vowel) + suffix
- Root carries the core meaning, usually an organ or tissue.
- Prefix modifies — location, number, timing, negation.
- Suffix supplies the action, condition, or procedure.
- The combining vowel, usually o, joins a root to a consonant-initial suffix: cardi-o-megaly.
Worked decodings:
- hepat/o (liver) + splen/o (spleen) + -megaly (enlargement) = hepatosplenomegaly: enlarged liver and spleen.
- sub- (beneath) + arachnoid (the arachnoid membrane) + hemorrhage = subarachnoid hemorrhage: bleeding beneath the arachnoid membrane.
- peri- (around) + cardi/o (heart) + -al = pericardial; blood in that space is a hemopericardium, which produces cardiac tamponade.
- a- (without) + sphyx (pulse) + -ia = asphyxia.
- athero- (fatty plaque) + scler/o (hardening) + -osis (condition) = atherosclerosis.
2. High-Yield Roots
| Root | Meaning | Root | Meaning | |
|---|---|---|---|---|
| cardi/o | heart | hepat/o | liver | |
| angi/o, vas/o | vessel | nephr/o, ren/o | kidney | |
| pulmon/o, pneum/o | lung, air | gastr/o | stomach | |
| encephal/o | brain | enter/o | intestine | |
| mening/o | meninges | oste/o | bone | |
| my/o | muscle | derm/o, cutane/o | skin | |
| neur/o | nerve | hem/o, hemat/o | blood | |
| cyt/o | cell | thorac/o | chest | |
| cerebr/o | cerebrum | arthr/o | joint | |
| tox/o | poison | phleb/o, ven/o | vein |
3. High-Yield Prefixes and Suffixes
Prefixes: a-/an- (without), brady- (slow), tachy- (fast), hyper- (above, excessive), hypo- (below, deficient), peri- (around), epi- (upon), sub- (beneath), endo- (within), intra- (inside), extra- (outside), poly- (many), dys- (difficult, abnormal), hemi- (half), contra- (against, opposite), ante- (before), post- (after), trans- (across).
Suffixes:
| Suffix | Meaning | Example |
|---|---|---|
| -itis | inflammation | myocarditis, meningitis |
| -osis | abnormal condition | atherosclerosis, cirrhosis |
| -emia | blood condition | anemia, uremia, hypoglycemia |
| -pathy | disease | cardiomyopathy, neuropathy |
| -otomy | cutting into | thoracotomy, craniotomy |
| -ectomy | surgical removal | appendectomy, splenectomy |
| -ostomy | surgically created opening | colostomy, tracheostomy |
| -plasty | surgical repair | angioplasty |
| -megaly | enlargement | cardiomegaly |
| -oma | tumor, mass | hematoma, carcinoma |
| -algia | pain | myalgia |
| -rrhage, -rrhagia | bursting forth, bleeding | hemorrhage |
| -sclerosis | hardening | nephrosclerosis |
| -pnea | breathing | dyspnea, apnea |
| -uria | urine condition | hematuria, anuria |
| -stenosis | narrowing | aortic stenosis |
| -plegia | paralysis | hemiplegia |
| -emesis | vomiting | hematemesis |
The -otomy / -ectomy / -ostomy trio is the distinction most frequently tested, because confusing them changes what was done to a body. A tracheotomy is the incision; a tracheostomy is the resulting opening; a lobectomy removed a lobe.
4. Terms an Investigator Meets in Records
| Term | Plain meaning |
|---|---|
| Atherosclerotic cardiovascular disease (ASCVD) | Narrowing of arteries by plaque; the leading cause of sudden natural death in adults |
| Myocardial infarction | Heart muscle death from interrupted blood supply |
| Cardiomegaly | Enlarged heart, commonly from hypertension |
| Cardiomyopathy | Primary disease of the heart muscle |
| Congestive heart failure | Heart cannot pump adequately; fluid accumulates |
| Atrial fibrillation | Irregular atrial rhythm; a stroke risk treated with anticoagulation |
| Cerebrovascular accident | Stroke, ischemic or hemorrhagic |
| Intracerebral hemorrhage | Bleeding into brain tissue, classically hypertensive |
| Subdural hematoma | Blood between dura and arachnoid, often from bridging vein tearing |
| Pulmonary thromboembolism | Clot, usually from a leg vein, lodged in the pulmonary circulation |
| Chronic obstructive pulmonary disease | Emphysema and chronic bronchitis |
| Aspiration pneumonia | Lung infection from inhaled material |
| Cirrhosis | End-stage liver scarring; causes esophageal varices |
| Esophageal varices | Dilated esophageal veins that can bleed catastrophically |
| Diabetic ketoacidosis | Severe insulin deficiency with ketone accumulation |
| Sepsis | Life-threatening organ dysfunction from infection |
| Uremia | Retained nitrogenous waste from kidney failure |
| Status epilepticus | Prolonged or repeated seizure activity |
Common record abbreviations: Hx history, Dx diagnosis, Rx prescription, Tx treatment, s/p status post, c/o complains of, NKA no known allergies, SOB shortness of breath, HTN hypertension, CAD coronary artery disease, CHF congestive heart failure, DM2 type 2 diabetes, CVA stroke, PE pulmonary embolism, ETOH ethanol, CABG coronary artery bypass graft, EF ejection fraction, DNR do not resuscitate, POLST physician orders for life-sustaining treatment, NPO nothing by mouth.
Some abbreviations are formally discouraged in clinical writing because they are misread — U for units, IU, QD, QOD, MS, and any trailing zero after a decimal point. Investigators should transcribe them as written and then spell out the meaning, never silently "correct" a record.
5. Reading the Medication List as a Medical History
A pill bottle inventory is a diagnosis list when no diagnosis list exists.
| Medication | Implied condition | Forensic relevance |
|---|---|---|
| Metoprolol, carvedilol, lisinopril | Hypertension, heart failure, post-infarction | Supports cardiac natural death |
| Furosemide | Fluid overload, heart failure | Supports cardiac natural death |
| Warfarin, apixaban, rivaroxaban, clopidogrel | Anticoagulation or antiplatelet therapy | Minor head trauma can produce fatal hemorrhage; flag in every fall case |
| Insulin, metformin | Diabetes | Consider hypoglycemia and ketoacidosis; check for pumps and glucometers |
| Levothyroxine | Hypothyroidism | Rarely causal |
| Albuterol inhaler, home oxygen | Asthma, COPD | Supports respiratory natural death |
| Phenytoin, levetiracetam, valproate | Seizure disorder | Consider sudden unexpected death in epilepsy; drug levels are relevant |
| Methadone, buprenorphine | Opioid use disorder treatment | Both treatment and toxicologic significance |
| Oxycodone, hydromorphone, fentanyl patches | Opioid analgesia | Count applied and discarded patches; patches are routinely missed |
| Alprazolam, clonazepam | Anxiety, seizure | Additive respiratory depression with opioids |
| Clozapine, olanzapine, lithium | Serious psychiatric illness | Lithium and clozapine have narrow therapeutic ranges |
| Naloxone in the residence | Known overdose risk | Document whether it was deployed |
| Sildenafil with nitrates | Contraindicated combination | Cardiovascular collapse risk |
Devices are also history. A dialysis fistula indicates end-stage renal disease. A continuous positive airway pressure machine indicates sleep apnea. A glucometer with a logbook can date the last reading. An implanted defibrillator stores the terminal rhythm.
6. Using the Vocabulary Without Overstepping
Precision is the goal; diagnosis is not the investigator's role.
- Correct: "Decedent had a documented history of atherosclerotic cardiovascular disease with coronary artery bypass grafting in 2019 and an ejection fraction of 25 percent per the 2026 cardiology note."
- Incorrect: "Decedent died of a heart attack."
- Correct: "A 6 cm area of purple discoloration overlies the left temporal scalp."
- Incorrect: "Decedent sustained a contrecoup injury."
State what the record says and attribute it. State what you observed and describe it. Leave the diagnosis to the person who performs the examination and signs the certificate.
A hospital record documents that the decedent underwent a "colostomy" three months before death, and a separate note references a prior "cholecystectomy." What do these terms indicate?
An 82-year-old decedent fell from standing height two days before death and struck her head. The scene medication inventory includes apixaban and metoprolol. Which fact should the investigator flag most urgently to the pathologist?
Which entry is written correctly for a medicolegal investigative narrative?