Albumin and Plasma Proteins — MCQs
What is the Child-Pugh class for a patient who has a serum bilirubin of 2.5 mg/dL, serum albumin of 3 g/dL, INR of 2, mild ascites, but no encephalopathy?
In which condition is the Albumin to Globulin (A:G) ratio maintained?
Which of the following is a prognostic factor in acute liver failure?
Normal CRP with elevated ESR is seen in:
Which of the following is not an acute phase reactant?
What is the approximate half-life of albumin in the human body?
Which of the following laboratory findings is the MOST characteristic of Wilson's disease?
Which of the following proteins is NOT synthesized in the liver?
Which of the following is a plasma protein involved in blood clotting?
What is the half-life of Prealbumin?
Albumin and Plasma Proteins Indian Medical PG Practice Questions and MCQs
Question 1: What is the Child-Pugh class for a patient who has a serum bilirubin of 2.5 mg/dL, serum albumin of 3 g/dL, INR of 2, mild ascites, but no encephalopathy?
- A. Child-Pugh Class B (Correct Answer)
- B. Child-Pugh Class A
- C. Child-Pugh Class D
- D. Child-Pugh Class C
Explanation: ***Child-Pugh Class B*** - A serum bilirubin of **2.5 mg/dL** (2 points), serum albumin of **3 g/dL** (2 points), INR of **2** (2 points), and mild ascites (2 points), with no encephalopathy (1 point), sums up to a total of 9 points, which falls into the range for **Child-Pugh Class B** (7-9 points) [1]. - This class indicates **moderate hepatic dysfunction** and is characterized by a higher risk of complications and mortality compared to Class A. *Child-Pugh Class A* - This class is assigned for a total score of **5-6 points**, indicating **well-compensated hepatic disease**. - The patient's total score of 9 points exceeds the threshold for Class A, suggesting more significant liver impairment. *Child-Pugh Class D* - There is no Child-Pugh Class D; the classification system only includes classes A, B, and C. - This option is therefore incorrect based on the established Child-Pugh scoring system. *Child-Pugh Class C* - This class corresponds to a total score of **10-15 points**, indicative of **severe hepatic decompensation**. - The patient's calculated score of 9 points is below the minimum required for Child-Pugh Class C.
Question 2: In which condition is the Albumin to Globulin (A:G) ratio maintained?
- A. Nephritic syndrome (Correct Answer)
- B. Cirrhosis
- C. Protein losing enteropathy
- D. Multiple myeloma
Explanation: ***Nephritic syndrome*** - In nephritic syndrome, the **glomerular filtration is often preserved**, allowing for the maintenance of A:G ratio despite the presence of hematuria and proteinuria [1]. - The condition typically leads to a **moderate degree of proteinuria**, retaining a relatively normal serum albumin level [1]. *Multiple myeloma* - In multiple myeloma, there is often a **high level of paraproteins** leading to a significant drop in albumin, affecting the A:G ratio. - Patients frequently exhibit **renal impairment**, resulting in a disrupted A:G ratio due to increased urinary protein loss. *Protein losing enteropathy* - This condition causes **loss of proteins** like albumin through the gastrointestinal tract, leading to **hypoalbuminemia** and altered A:G ratio. - It is characterized by **diarrhea** and fluid accumulation, further impacting the protein status in circulation. *Cirrhosis* - Cirrhosis leads to **decreased albumin synthesis**, resulting in a low serum albumin and an altered A:G ratio. - The condition is associated with **portal hypertension** and ascites, complicating the biochemical status.
Question 3: Which of the following is a prognostic factor in acute liver failure?
- A. Alpha-fetoprotein (AFP)
- B. Prothrombin time (PT) (Correct Answer)
- C. Serum albumin level
- D. Serum globulin level
Explanation: - **Prothrombin time (PT)** is a crucial prognostic factor in acute liver failure because the liver synthesizes **coagulation factors**, and severe liver dysfunction impairs this synthesis [1]. - A **prolonged PT** indicates reduced synthetic function of the liver, reflecting the severity of hepatic damage and poorer prognosis [1], [2]. *Alpha-fetoprotein (AFP)* - **Alpha-fetoprotein (AFP)** is primarily a tumor marker for **hepatocellular carcinoma** and germ cell tumors. - While it can be elevated in some liver diseases, it is not a direct or reliable prognostic marker for acute liver failure. *Serum albumin level* - **Serum albumin** is a measure of the liver's synthetic function, but its half-life is approximately **3 weeks**. - This makes it a better indicator of **chronic liver disease** rather than the rapid changes seen in acute liver failure. *Serum globulin level* - **Serum globulin levels** reflect a mixture of proteins, including immunoglobulins, and are not specific markers of acute liver failure severity. - Elevated globulins are often associated with **chronic inflammation** or certain autoimmune conditions.
Question 4: Normal CRP with elevated ESR is seen in:
- A. RA
- B. SLE (Correct Answer)
- C. Polymyalgia rheumatica
- D. Scleroderma
Explanation: ***SLE*** - In **Systemic Lupus Erythematosus (SLE)**, the **ESR** is often significantly elevated due to hypergammaglobulinemia and increased fibrinogen, reflecting systemic inflammation [2]. - However, the **CRP** may be normal or only mildly elevated, which is a distinguishing feature compared to other inflammatory conditions [1], [2]. *RA* - In **Rheumatoid Arthritis (RA)**, both **CRP and ESR** are typically elevated, reflecting the acute phase response due to active inflammation. - An isolated elevated ESR with a normal CRP is less common in active RA and would prompt consideration of alternative or co-existing conditions. *Scleroderma* - For **Scleroderma (Systemic Sclerosis)**, the **ESR and CRP** are often normal or only mildly elevated, even in the presence of extensive organ involvement [1]. - Significant elevations in both ESR and CRP should prompt a search for alternative diagnoses or complications such such as an infection. *Polymyalgia rheumatica* - **Polymyalgia Rheumatica (PMR)** is characterized by marked inflammation, leading to a **significantly elevated ESR and CRP** [2]. - A normal CRP with an elevated ESR would be atypical for PMR, which is primarily diagnosed based on clinical symptoms and this distinct inflammatory marker pattern.
Question 5: Which of the following is not an acute phase reactant?
- A. C-reactive protein
- B. Haptoglobin
- C. Endothelin (Correct Answer)
- D. Fibrinogen
Explanation: ***Endothelin*** - Endothelin is a **vasoconstrictive peptide** primarily involved in regulating **blood vessel tone** and blood pressure. - While it plays a role in processes like inflammation and tissue repair, it is not synthesized or regulated in the same rapid, systemic manner as a classic acute phase reactant. *C-reactive protein* - **C-reactive protein (CRP)** is a rapidly responding acute phase reactant produced by the liver in response to **inflammation**, infection, and tissue injury. - Its levels can rise dramatically within hours of an inflammatory stimulus and are used as a marker for disease activity. *Haptoglobin* - **Haptoglobin** is an acute phase reactant that binds to free **hemoglobin** released from red blood cells during hemolysis, preventing oxidative damage. - Its levels typically increase during acute inflammation or infection, although it can also decrease with severe hemolysis. *Fibrinogen* - **Fibrinogen** is a critical acute phase protein involved in the **coagulation cascade** and wound healing. - Its concentration increases significantly during acute inflammation, contributing to the elevated **erythrocyte sedimentation rate (ESR)**.
Question 6: What is the approximate half-life of albumin in the human body?
- A. 30 days
- B. 20 days (Correct Answer)
- C. 3 days
- D. 7 days
Explanation: ***20 days*** - The **half-life of albumin** in the human body is approximately **20 days**, reflecting the time it takes for half of the circulating albumin to be catabolized or excreted. - This relatively long half-life means that changes in albumin levels, such as those due to malnutrition or liver disease, may take several weeks to become evident. *3 days* - A half-life of 3 days is too short for albumin, which is a major, long-lasting plasma protein. - Proteins with such a short half-life typically include more rapidly turnover proteins or small peptides. *7 days* - A half-life of 7 days is also too short for albumin, which plays a critical role in maintaining plasma oncotic pressure and transporting various substances. - While some proteins have a 7-day half-life, albumin's is considerably longer. *30 days* - A half-life of 30 days is longer than the typical half-life of albumin. - While some proteins may have half-lives in this range, 20 days is the more commonly accepted value for albumin.
Question 7: Which of the following laboratory findings is the MOST characteristic of Wilson's disease?
- A. Elevated serum copper
- B. Low serum copper
- C. Increased urinary copper excretion (Correct Answer)
- D. Low ceruloplasmin
Explanation: ***Low ceruloplasmin and high urinary copper*** - In Wilson's disease, there is decreased **ceruloplasmin** due to impaired copper metabolism, leading to low levels in the serum [1]. - The condition results in **increased urinary copper excretion**, which is a hallmark feature and confirms the diagnosis [2]. *Low urinary copper* - Wilson's disease presents with **high urinary copper** levels due to excessive copper being expelled by the kidneys. - **Low urinary copper** would suggest a different condition, such as **Chronic liver disease** or **renal tubular disorders**. *High ceruloplasmin* - Patients with Wilson's disease have **low ceruloplasmin levels** rather than high, indicating ineffective copper transport [1]. - **High ceruloplasmin** levels are typically associated with conditions like **inflammation** or **pregnancy** rather than Wilson's disease. *Low serum copper* - In Wilson's disease, serum copper levels are typically **normal or elevated**, not low. - The primary defect is in the transport of copper, resulting in accumulation in tissues, not a deficiency in serum levels [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Liver and Gallbladder, pp. 855-856. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 132-133.
Question 8: Which of the following proteins is NOT synthesized in the liver?
- A. Albumin
- B. Plasma enzymes
- C. Immunoglobulins (Correct Answer)
- D. Acute phase proteins
Explanation: **Immunoglobulins** - Immunoglobulins (antibodies) are primarily synthesized by **plasma cells**, which are differentiated B lymphocytes, not by the liver. - Their production is a crucial part of the **adaptive immune response** to pathogens and foreign substances. *Albumin* - **Albumin** is the most abundant protein in plasma and is exclusively synthesized in the liver. - It plays a critical role in maintaining **oncotic pressure** and transporting various substances in the blood. *Plasma enzymes* - Many **plasma enzymes**, such as those involved in coagulation (e.g., clotting factors) and complement system, are synthesized by the liver. - The liver is a major site for the production of proteins that circulate in the plasma and perform various functions. *Acute phase proteins* - **Acute phase proteins**, like C-reactive protein (CRP) and fibrinogen, are primarily synthesized by the liver in response to inflammation. - Their production is upregulated by cytokines released during the **acute phase response**.
Question 9: Which of the following is a plasma protein involved in blood clotting?
- A. Fibrinogen (Correct Answer)
- B. Lactate dehydrogenase (LDH)
- C. Aspartate aminotransferase (SGOT)
- D. Alanine aminotransferase (SGPT)
Explanation: ***Fibrinogen*** - **Fibrinogen** is a crucial plasma protein that is converted into **fibrin** during the coagulation cascade. - **Fibrin** then forms a meshwork, which is the structural basis of a **blood clot**. *Lactate dehydrogenase (LDH)* - **LDH** is an enzyme found in many tissues throughout the body and is involved in **cellular metabolism**, specifically the conversion of pyruvate to lactate. - Elevated levels of **LDH** can indicate tissue damage or disease but are not directly involved in blood clotting. *Aspartate aminotransferase (SGOT)* - **SGOT** (now commonly referred to as **AST**) is an enzyme primarily found in the **liver, heart, skeletal muscle, kidneys, brain, and red blood cells**. - High levels of **AST** are often indicative of **liver damage** or other organ injury, but it does not play a direct role in blood coagulation. *Alanine aminotransferase (SGPT)* - **SGPT** (now commonly referred to as **ALT**) is an enzyme predominantly found in the **liver**. - Elevated **ALT** levels are a sensitive marker for **liver cell damage** but are not involved in the blood clotting process.
Question 10: What is the half-life of Prealbumin?
- A. 2 days (Correct Answer)
- B. 10 days
- C. 20 days
- D. 40 days
Explanation: ***2 days*** - Prealbumin, also known as transthyretin, has a **short half-life** of approximately 2-3 days, making it a sensitive indicator of recent changes in **nutritional status**. - Its rapid turnover allows for prompt reflection of improvement or deterioration in protein synthesis. *10 days* - A half-life of 10 days would make prealbumin less responsive to acute changes in nutrition compared to its actual turnover rate. - This duration is longer than the typical half-life of proteins used to monitor **short-term nutritional status**. *20 days* - A 20-day half-life would indicate a protein with a much slower turnover, unsuitable for monitoring **acute nutritional interventions**. - Proteins with such long half-lives, like **albumin**, reflect more chronic states rather than rapid changes. *40 days* - A half-life of 40 days is characteristic of proteins like **albumin**, which are influenced by longer-term nutritional and inflammatory processes. - Such a long half-life would not be useful for assessing immediate responses to **nutritional support** or acute disease states.
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