The ABMDI (American Board of Medicolegal Death Investigators) certifies medicolegal death investigators (MDIs) who work in medical examiner and coroner offices across the United States. The board offers two credential levels: the Registry credential (ABMDI-R) for entry-level investigators who are new to the field, and the Board Certified credential (ABMDI-BC) for experienced investigators who can demonstrate advanced competency. Both credentials validate the knowledge and skills required to conduct thorough, legally defensible death investigations.
This free ABMDI practice test PDF gives you a portable, printable set of exam-style questions covering all major content domains — from death scene documentation and postmortem interval estimation to manner and cause of death classification and special investigation scenarios. Print it, work through it at your own pace, and use it to identify the topics that require more focused review before your certification appointment. Printed practice is especially effective for the regulatory and procedural content that dominates the ABMDI exam.
The foundation of medicolegal death investigation is scene response and jurisdictional determination. MDIs must know which categories of death require notification to the medical examiner or coroner: unattended deaths (those occurring without a physician present or without prior hospice care), violent deaths of any mechanism, suspicious deaths where circumstances are unclear, deaths occurring during or shortly after medical procedures, and deaths in custody or institutional settings. Scene security and chain of custody begin the moment the investigator arrives — preserving evidence and preventing contamination are legal as well as scientific obligations.
Body examination at the scene is a critical skill tested on both ABMDI credential levels. Livor mortis (lividity) — the pooling of blood in dependent areas after circulation ceases — provides information about both time since death and whether the body was moved after death. Fixed lividity indicates the blood has coagulated and the body has been in one position for a sufficient time; lividity that blanches under pressure is still unfixed. Rigor mortis progresses through stages driven by ATP depletion in muscle tissue — appearing first in small muscles (face and jaw), generalizing, then resolving — and its onset and resolution are affected by ambient temperature, body size, and physical activity prior to death. Algor mortis, the cooling of the body toward ambient temperature, follows a roughly predictable curve that investigators use to estimate the postmortem interval, though environmental factors significantly affect accuracy.
Decomposition staging — from fresh through bloat, active decay, and skeletonization — is tested in both standard and advanced scenarios. Injury pattern recognition at the scene includes identifying blunt force trauma (lacerations with abraded margins, patterned contusions), sharp force injuries (clean-edged incised wounds vs. deeper stab wounds), and gunshot wounds. For gunshot wounds, candidates must distinguish entrance from exit wound characteristics: entrance wounds typically show marginal abrasion rings and may have stippling or soot in contact or near-contact ranges, while exit wounds are generally larger and more irregular without soot or stippling.
Systematic documentation is both a legal requirement and an investigative safeguard. Photography follows a three-level protocol: establishing shots that capture the overall scene and body position in context, mid-range shots that document the relationship of the body to surrounding objects and evidence, and close-up shots that detail specific injuries, evidence items, and identifying features. All photography must occur before the scene is disturbed — repositioning the body for better photographs after altering the scene is a chain-of-custody violation.
Written documentation includes detailed scene notes and a scene sketch that captures measurements and spatial relationships. Trace evidence collection — hair, fibers, gunshot residue, biological fluids — requires appropriate personal protective equipment and proper packaging to prevent cross-contamination. Medications found at the scene must be documented by name, quantity, prescription date, prescribing physician, and dispensing pharmacy, as this information is critical for toxicology interpretation. Medical equipment such as defibrillator pads, IV lines, and airway devices must be documented and, where possible, preserved for the pathologist's examination.
Witness and first-responder interviews provide behavioral and contextual information that physical evidence cannot. Key questions include the decedent's last known alive time, any witnessed events preceding death, the decedent's medical history and current medications, and any history of substance use, mental health treatment, or prior suicide attempts. Obtaining a thorough medical history from family, treating physicians, and electronic health records directly informs the pathologist's preliminary and final cause of death determination.
Death certificates require both a cause of death and a manner of death, and ABMDI exam items frequently test candidates on the distinction between these concepts and the five recognized manners. The cause of death is the specific disease, injury, or condition that directly resulted in death — recorded in a sequence from the immediate cause back to the underlying cause. The mechanism of death is the physiological derangement that caused death (e.g., cardiac arrhythmia or hemorrhagic shock), which is distinct from the cause. The manner of death is classified as one of five categories: Natural, Accident, Homicide, Suicide, or Undetermined.
Classifying manner of death correctly requires understanding the legal and medical definitions of each category. Natural deaths result from disease alone without any contributing injury or external event. Accidents occur when an unintentional external event contributes to death. Homicide means that a human act caused the death — it is a medicolegal term, not a legal finding of criminal culpability. Suicide requires evidence of intent to self-harm. Undetermined is appropriate when available evidence is insufficient to classify the manner with reasonable probability.
Preliminary cause of death is provided before autopsy results are available; the final cause of death is certified after the forensic pathologist completes the autopsy and reviews toxicology, histology, and ancillary test results. MDIs must understand when to provide a preliminary opinion and how to communicate uncertainty appropriately to law enforcement and family members.
ABMDI exam content includes several categories of special investigations that require unique scene protocols. Sudden infant death syndrome (SIDS) and sudden unexplained infant death (SUID) investigations require a standardized scene investigation protocol: a detailed safe sleep environment assessment, examination of the sleep surface and bedding, doll re-enactment of sleeping position if caretakers are available, and thorough medical and social history. The distinction between SIDS (a diagnosis of exclusion after complete autopsy, toxicology, and scene investigation), suffocation, and metabolic disorders is a core testing area.
Drowning investigations require documentation of the body recovery location, water depth and temperature, evidence of trauma or restraint, and collection of diatom samples where appropriate. Fire death investigations must address whether the decedent was alive during the fire — demonstrated by soot in the airway, elevated carboxyhemoglobin levels, and vital reaction in burn margins — or whether the fire was used to conceal a prior homicide. In-custody deaths trigger mandatory reporting and documentation protocols, and occupational death investigations require coordination with OSHA. Motor vehicle fatality investigations document occupant position, restraint use, airbag deployment, and injury patterns consistent or inconsistent with the reported mechanism.
The United States operates under two parallel systems for investigating deaths. Medical examiner systems are staffed by physician-forensic pathologists (or, at the investigator level, trained MDIs) who are appointed based on professional qualifications. Coroner systems, still active in many states, elect the coroner who may or may not be a physician. ABMDI candidates must understand how jurisdiction is asserted, what legal authority the ME or coroner has to require an autopsy, and how the two systems differ in practice.
Toxicology sampling is a tested area requiring knowledge of appropriate sample types. Antemortem blood (collected before death) is the gold standard for drug quantitation; postmortem blood is subject to redistribution, which can artificially elevate concentrations of certain drugs. Vitreous humor from the eye is resistant to redistribution and provides reliable glucose, electrolyte, and some drug data. Urine is a qualitative sample useful for confirming drug presence. Proper labeling, storage temperature, and chain-of-custody documentation for all biological samples are fundamental requirements. For law enforcement liaison, MDIs must understand evidence packaging, sealing, and transfer procedures to ensure admissibility.
Effective preparation for the ABMDI exam combines regulatory knowledge with applied scene investigation skills. The exam rewards candidates who understand the reasoning behind protocols — why livor is checked before moving a body, why vitreous humor is preferred for certain toxicology tests, why a SUID investigation requires a structured scene protocol even when the death initially appears natural. Supplement this PDF with the ABMDI candidate handbook, DiMaio and DiMaio's Handbook of Forensic Pathology, and the CDC SUID case registry protocols. For additional practice questions organized by topic, visit the ABMDI practice test page on PracticeTestGeeks.
PracticeTestGeeks offers free online ABMDI practice tests covering death scene investigation, documentation, manner and cause of death, special scenarios, and medicolegal systems. Each question includes a detailed explanation to reinforce correct reasoning. Visit the ABMDI practice test page to begin your online practice today.