ketosis

What are the three clinical conditions of ketosis?

• Ketonemia

• Ketonuria

• Acetone breath

What is Ketonemia?

Presence of high ketone bodies in the blood (> 1 mg/dl)

What is Ketonuria?

Excretion of large amounts of ketone bodies in urine (> 100 mg/day).

What causes acetone breath

Acetone released via the lungs, causing a distinct smell (like nail polish remover).

What conditions lead to increased ketone body synthesis

• Uncontrolled diabetes mellitus

• Prolonged starvation

Why do ketones accumulate in uncontrolled diabetes?

Lipolysis increases, producing more acetyl-CoA. Since oxaloacetate is used for gluconeogenesis, acetyl-CoA is diverted to ketogenesis.

Why do ketones accumulate during starvation?

Lipolysis increases, producing more acetyl-CoA. Lack of glucose decreases oxaloacetate, diverting acetyl-CoA into ketogenesis.

What are the major ketone bodies produced during ketosis?

Acetoacetic acid and β-hydroxybutyric acid.

What is ketoacidosis

Accumulation of ketone bodies (acetoacetic acid and β-hydroxybutyric acid) leads to bicarbonate deficit, causing decreased blood pH (acidosis).

Which tests are used to detect ketone bodies in urine?

1. Rothera’s test

2. Gerhardt’s test

How is Rothera’s test performed?

1. Saturate urine with ammonium sulfate.

2. Add sodium nitroprusside and liquor ammonia.

3. Purple ring indicates ketone bodies.

How is Gerhardt’s test performed?

• Add FeCl₂ to urine.

• Port-wine color indicates acetoacetate

What is Ketonemia?

A) Presence of ketone bodies in urine
B) Presence of ketone bodies in blood
C) Acetone breath
D) Increased glucose in blood

B

Which of the following conditions can lead to ketosis?

A) Uncontrolled diabetes mellitus
B) Starvation
C) Both A and B
D) None of the above

C

What is the primary mechanism for ketosis in uncontrolled diabetes?

A) Increased glucose oxidation
B) Increased lipolysis and β-oxidation due to glucose deficiency
C) Increased fat intake
D) Decreased insulin production

B

In starvation, the body switches to ketosis primarily due to:

A) Decreased lipolysis
B) Increased lipogenesis
C) Decreased glucose availability
D) Increased protein breakdown

C

What is the most common test for detecting ketone bodies in the urine?

A) Urinary pH test
B) Rothera's test
C) Blood sugar test
D) Proteinuria test

B

What color change is observed in Gerhardt's test when acetoacetate is present?

A) Blue
B) Green
C) Port-wine color
D) Yellow

C

Which of the following ketone bodies is not typically produced in ketosis?

A) Acetoacetic acid
B) β-Hydroxybutyric acid
C) Acetone
D) Glucose

D

Which of the following is NOT a clinical condition associated with ketosis?

A) Ketonemia
B) Ketonuria
C) Hypoglycemia
D) Acetone breath

C

What is the main cause of ketoacidosis in uncontrolled diabetes?

A) Accumulation of glucose in blood
B) Excess production of ketone bodies leading to metabolic acidosis
C) Excessive insulin production
D) Lack of fatty acid breakdown

B

Which of the following is NOT a ketone body?

A) Acetoacetic acid
B) Acetone
C) β-Hydroxybutyric acid
D) Glutamine

D

What is the main cause of ketoacidosis in starvation?

A) Excessive protein intake
B) Increased lipolysis and ketone body production
C) Lack of oxaloacetate for the TCA cycle
D) Increased glucose production

B

What would you expect to find in a urine test for someone in ketosis?

A) High protein content
B) High ketone bodies
C) High glucose levels
D) High red blood cells

B

The production of ketone bodies occurs primarily in which organ?

A) Liver
B) Kidneys
C) Pancreas
D) Muscles

A

Which of the following is NOT a result of prolonged ketosis?

A) Increased production of ketone bodies
B) Decreased blood pH (acidosis)
C) Increase in insulin levels
D) Risk of dehydration

C

What is a key feature of acetone breath in ketosis?

A) Sweet-smelling breath
B) Alcohol-like smell
C) Ammonia-like smell
D) Rotten egg smell

B

What test is used to detect acetoacetate in urine?

A) Rothera's test
B) Gerhardt's test
C) Benedict's test
D) Clinitest

B

Which of the following is the result of ketoacidosis in uncontrolled diabetes?

A) Increased blood pH
B) Decreased blood glucose
C) Decreased bicarbonate levels and metabolic acidosis
D) Normal insulin levels

C

In which of the following conditions is acetone breath most commonly observed?

A) Hyperthyroidism
B) Ketosis (due to diabetes or starvation)
C) Hypertension
D) Chronic kidney disease

B

What would likely happen if the rate of ketone body production exceeds the body’s ability to utilize them?

A) Ketonemia and ketonuria
B) Increase in blood glucose levels
C) Decreased insulin secretion
D) Excessive lipogenesis

A

Which ketone body is primarily eliminated via the lungs, contributing to acetone breath?

A) Acetoacetic acid
B) β-Hydroxybutyric acid
C) Acetone
D) Glucose

C