1.1 Overview of NPLEX Part I & NABNE Exam Structure
Key Takeaways
- NPLEX Part I is administered by NABNE and delivered via Prometric as a 200-item computer-based test divided into two 2.5-hour sessions.
- The five Specific Exam Areas contribute approximately 40 questions each; they group into Structure/Function (about 60%) and Disease/Dysfunction (about 40%).
- Candidates must be enrolled in or have graduated from a CNME-accredited naturopathic medical program and have completed all basic science prerequisites.
- Exams are held semi-annually in August and February, requiring registration months in advance through NABNE.
1.1 Overview of NPLEX Part I & NABNE Exam Structure
The current NPLEX Part I — Biomedical Science Examination (BSE) measures whether a student has the biomedical foundation needed to enter the clinical phase of naturopathic medical training. NPLEX develops the examination; the North American Board of Naturopathic Examiners (NABNE) administers it and reports results. The facts below follow the blueprint revised in March 2026 for the August 2026 administrations and the current NABNE examinee handbook.
Administration and Format
Part I is delivered in person at Prometric testing centers. All 200 items are arranged as 50 brief case clusters, with four one-best-answer questions attached to each case.
| Feature | Current published structure |
|---|---|
| Total items | 200 multiple-choice questions |
| Case structure | 50 clusters × 4 questions |
| Sessions | Two same-day sessions |
| Items per session | 100 |
| Time per session | 150 minutes |
| Scheduled break | 60 minutes |
| Calculator | Not available |
| Unanswered items | Scored incorrect |
The two testing sessions provide five total hours of item time. The scheduled break is separate. Candidates should mark an answer for every item; NPLEX explicitly warns that an unanswered item is incorrect.
Two Blueprint Layers
The blueprint describes content in two complementary ways. Do not turn either layer into the obsolete 20%/24%/16% discipline split.
General and Specific Exam Areas
| General Exam Area | Specific Exam Areas | Approximate share |
|---|---|---|
| Structure/Function | Anatomy; Physiology; Biochemistry & Genetics | 60% |
| Disease/Dysfunction | Microbiology & Immunology; Pathology | 40% |
Across the full examination, the guide says there are approximately 40 questions from each of the five Specific Exam Areas. That wording does not establish unequal fixed discipline percentages. Candidates must ultimately demonstrate competence in both General Exam Areas; Section 1.3 explains the passing method.
Body-System Focus
NPLEX also publishes approximate system percentages. These sum to 100% and show where biomedical competencies are applied across the case clusters.
| System | Approximate share |
|---|---|
| Cardiovascular | 12% |
| Endocrine | 8% |
| Gastrointestinal | 12% |
| Hematopoietic | 6% |
| Immunological | 8% |
| Integumentary | 6% |
| Musculoskeletal | 10% |
| Neurological | 10% |
| Pulmonary + upper respiratory | 8% |
| Reproductive | 10% |
| Urinary | 10% |
These system percentages are not separate sections or a promise that every competency appears on every form. Questions may connect several systems inside one case.
Eligibility and Current Instructions
Eligibility, application dates, fees, accommodations, identification rules, and testing-window procedures belong to the current NABNE Examinee Handbook. Candidates ordinarily qualify through a CNME-accredited or candidate naturopathic medical program after the school verifies completion of the required biomedical sciences. Because administration policies can change, use the handbook linked by NABNE rather than relying on an older course summary.
For study planning, first balance the two GEAs, then use the 11 system percentages to distribute review. Keep biomedical mechanism at the center: Part I measures readiness for clinical training, not Part II treatment selection.
What is the total duration and question count of the NPLEX Part I examination?
How does the August 2026 blueprint distribute questions across the five Specific Exam Areas (SEAs)?
Which entity establishes academic accreditation standards for naturopathic medical programs whose students are eligible for NPLEX Part I?