Register
Question 1
A 67-year-old woman with a family history of colon cancer is reluctant to undergo colonoscopy. What is the primary concern with stool testing?
Correct Answer:
Low sensitivity
Explanation:
Stool testing, particularly for colorectal cancer screening, is often used as a non-invasive alternative to colonoscopy. However, the primary concern regarding stool testing is its low sensitivity in comparison to the gold standard of colonoscopy. Although stool tests can effectively detect some cases of colorectal cancer and advanced adenomas, they may not identify all existing cancers, leading to false-negative results. This means there is a genuine risk that some individuals who have colorectal cancer could receive a negative result from stool testing, thereby missing the opportunity for early detection and potentially life-saving intervention. While stool tests can have varying levels of specificity and may result in false-positive tests, the critical issue is that the sensitivity of these tests is not sufficient to confidently rule out disease when the risk is substantial, especially in patients with a familial history of colon cancer. Therefore, utilizing stool testing alone without follow-up colonoscopy might not adequately address the patient's risk profile.
Question 2
What is the expected impact of hypoxia on the pulmonary vasculature?
Correct Answer:
Hypoxic pulmonary vasoconstriction
Explanation:
Hypoxia has a significant impact on the pulmonary vasculature, primarily through the mechanism known as hypoxic pulmonary vasoconstriction. When oxygen levels are low in the lungs, the response of the pulmonary vessels is to constrict rather than dilate. This is a unique physiological response of the pulmonary circulation compared to systemic circulation, where hypoxia typically induces vasodilation. The rationale behind this response is to optimize gas exchange. In areas of the lung where there is low oxygen (hypoxia), constricting the pulmonary blood vessels redirects blood flow away from these poorly ventilated regions to areas of the lung that are better ventilated and have higher oxygen levels. This helps the body to improve overall oxygenation by ensuring that blood is delivered to regions of the lung that can more effectively oxygenate it. This mechanism is particularly important during conditions such as chronic lung disease or during exposure to high altitudes, where parts of the lung might not be adequately ventilated. By constricting the blood vessels in response to low oxygen, the body can maintain better perfusion of well-ventilated areas and improve its overall efficiency in oxygen uptake. The other options do not accurately represent the physiological response of the pulmonary vasculature to hypoxia, highlighting
Question 3
In the context of renal pathology, what primarily causes edema in nephrotic syndrome?
Correct Answer:
Excessive proteinuria
Explanation:
In nephrotic syndrome, the primary cause of edema is excessive proteinuria, which leads to a significant loss of serum proteins, particularly albumin. Albumin plays a crucial role in maintaining oncotic pressure—the pressure that holds fluid within the blood vessels. When there is substantial proteinuria, the levels of albumin in the blood decrease (a condition known as hypoalbuminemia). This reduction in oncotic pressure results in fluid moving from the intravascular space into the interstitial spaces of tissues, ultimately leading to edema. This mechanism illustrates why patients with nephrotic syndrome often present with generalized swelling, particularly in areas such as the legs and face. The severity of proteinuria directly correlates with the degree of edema observed, making excessive proteinuria a key hallmark of the syndrome. While excessive sodium retention and decreased renal blood flow can contribute to fluid retention in other conditions, they are not the primary drivers of the edema seen in nephrotic syndrome. Moreover, obstruction of lymphatic drainage is generally not a characteristic feature of nephrotic syndrome and does not account for the protein loss or the resultant edema in this context.
Question 4
What is the most likely cause of initial hypotension in a patient with sepsis and E. coli bacteremia?
Correct Answer:
Excessive production of nitric oxide
Explanation:
In sepsis, particularly with E. coli bacteremia, the initial hypotension is primarily caused by excessive production of nitric oxide. This occurs as a result of the systemic inflammatory response triggered by the infection. Lipopolysaccharides (LPS) from bacteria like E. coli stimulate the immune system, leading to the release of various pro-inflammatory cytokines. These cytokines activate various pathways, including the inducible nitric oxide synthase (iNOS) pathway, resulting in increased levels of nitric oxide (NO). The release of NO causes vasodilation, which is the widening of blood vessels. When blood vessels dilate, there is a decrease in vascular resistance, leading to a drop in blood pressure. This vasodilatory effect is significant in sepsis as it contributes to the characteristic hypotension observed in these patients. The resultant hypotension can lead to inadequate organ perfusion and subsequent organ dysfunction if not addressed promptly. Considering the other options, while oxidative stress might contribute to the pathophysiology of sepsis, the generation of hydrogen peroxide is not a direct cause of hypotension. Hemorrhage, on the other hand, would cause hypotension through blood loss, but that is not the initial mechanism in sepsis. Induction of
Question 5
After a biopsy of a cervical leukoplakia shows invasive squamous cell carcinoma, to which lymph nodes will lymph most likely drain first?
Correct Answer:
Internal iliac
Explanation:
Invasive squamous cell carcinoma of the cervix primarily drains lymphatic fluid to the local lymph nodes associated with the pelvic region. The first lymph nodes to receive drainage from cervical tissues are typically the internal iliac nodes. These nodes are located laterally to the cervix and are a key component of the pelvic lymphatic system. The internal iliac lymph nodes receive lymphatic drainage from the cervix and then can further drain into the common iliac nodes and subsequently to the lumbar and paraaortic nodes. However, the initial drainage from a cervical lesion, especially one that is invasive, involves the internal iliac lymph nodes. Understanding this pathway is crucial for assessing cancer spread and planning treatment. Other lymph nodes mentioned, like the femoral, superficial inguinal, and lumbar nodes, do not serve as the first site of lymphatic drainage for cervical cancer, which emphasizes the significance of the internal iliac nodes in this context.
Question 1
Exam overview

About this Exam

The NBME Form 28 Practice Exam, officially part of the Comprehensive Basic Science Self-Assessment (CBSSA) series, is a vital tool for medical students worldwide. It is specifically designed to assess a student’s readiness for the USMLE Step 1 examination. This practice test is intended for individuals currently enrolled in medical school or graduates who are in the intensive study phase for Step 1. By taking this self-assessment, students gain a clear understanding of their current knowledge base and can predict their potential performance on the actual high-stakes licensing exam. It provides an indispensable benchmark for identifying remaining knowledge gaps

More details

Additional Information

.What the Course Entails and Exam Details

As a comprehensive self-assessment, NBME Form 28 does not consist of a taught syllabus, but rather tests the mastery of core basic science concepts learned during the pre-clinical years of medical education. The content aligns directly with the established USMLE Step 1 content outline. Areas covered include fundamental principles of Anatomy, Behavioral Sciences, Biochemistry, Microbiology, Immunology, Pathology, Pharmacology, and Physiology. Additionally, the exam tests these disciplines across various organ systems, such as the Cardiovascular, Endocrine, Gastrointestinal, and Nervous systems. Students must apply their knowledge to solve clinical scenarios and understand disease mechanisms.

 

 

 What to Expect in the Final Exam

While not the "final" licensing exam, NBME Form 28 is designed to mirror the actual USMLE Step 1 experience as closely as possible. The examination is delivered in a multiple-choice question (MCQ) format, utilizing the single-best-answer style characteristic of the USMLE. Form 28 typically consists of four sections (blocks), with up to 50 questions per block, totaling roughly 200 questions. When taken under standard testing conditions, students are allowed 75 minutes per block, making the total testing time approximately five hours. Following completion, the NBME provides a comprehensive performance profile. This profile includes a result that indicates the student's probability of passing USMLE Step 1, rather than a specific three-digit score correlation, aligning with the current Step 1 Pass/Fail reporting structure.

 

 

 How to Study and Exam Centers

Effective preparation for NBME Form 28 requires a strategic, active learning approach rather than passive reviewing. Students should utilize comprehensive resource suites such as First Aid for the USMLE Step 1, primary question banks like UWorld, and supplementary video resources like Pathoma or Boards and Beyond. It is highly recommended to take Form 28 under strict timed conditions to accurately simulate the stamina required for the real exam day. Following the test, students must dedicate significant time to reviewing the provided answers and explanations for both correct and incorrect responses to solidify concepts. There are no physical testing centers for this practice exam. NBME Form 28 is administered exclusively online through the NBME Self-Service Portal, allowing students to purchase and take the exam from any location with a stable internet connection and a compatible computer.

 

 

 Job Opportunities from the Course

Passing NBME Form 28 is not a credential that directly leads to employment, but it is a critical milestone on the path to medical licensure in the United States. Successfully navigating this practice test signals that a student is ready to challenge the USMLE Step 1. Passing Step 1 is essential for completing medical school, entering residency training, and eventually practicing medicine. Here are career paths and roles that are unlocked by successfully completing the USMLE series (which involves mastering the material tested in NBME 28):

  • Licensed Physician (MD or DO) in all specialties
  • Medical Resident (GME trainee)
  • Clinical Fellow
  • Academic Medicine Faculty Member
  • Medical Researcher
  • Pharmaceutical Industry Consultant
  • Medical Science Liaison



 

Quiz information

Frequently Asked Questions

The complete question count is available after full access is unlocked.
No fixed duration is currently configured for this quiz.
Question explanations are included where they are available in the quiz content, helping you review the reasoning after answering.
Yes. You can retake the practice test again as you continue studying during your available access period.
After your access is confirmed, you can continue into the complete practice exam from this quiz flow.
Unless explicitly stated otherwise, this page provides independent practice material for study and exam preparation and is not the official examination itself.
Keep studying

Related Questions

ASU BMI201 Clinical Informatics Practice Exam

0 min

Certified Professional in Healthcare Information and Management Systems (CPHIMS) Practice Exam

0 min

Certified Professional in Learning and Performance (CPLP) Practice Exam

0 min

Certified in Risk and Information Systems Control (CRISC) Practice Test

0 min

Certified Release of Information Specialist (CRIS) Certification Practice Test

0 min

Charlie Formations Practice Exam

0 min