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Clinical Biochemistry and Laboratory Diagnostics
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Clinical Biochemistry and Laboratory Diagnostics
Clinical Biochemistry and Laboratory Diagnostics
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1
Question
Why is the screening for macroprolactinemia considered clinically important in laboratory diagnostics?
Page 1
Answer
Macroprolactin is biologically inactive but can falsely elevate prolactin measurements, leading to potential misdiagnosis of hyperprolactinemia.
2
Question
What is the clinical utility of measuring the anion gap in a patient?
Page 1
Answer
The anion gap is used to detect unmeasured anions, which indicates the presence of metabolic acidosis.
3
Question
What does a significant increase in unconjugated bilirubin typically suggest regarding pathology?
Page 1
Answer
It suggests hemolysis (increased RBC breakdown) or impaired hepatic conjugation of bilirubin.
4
Question
How do the dynamics of troponin release differ between NSTEMI and STEMI?
Page 1
Answer
In NSTEMI, troponin levels typically show a lower peak and a more gradual increase compared to STEMI.
5
Question
What are the primary characteristics of an ideal screening test?
Page 1
Answer
An ideal screening test is characterized by high sensitivity and low specificity.
6
Question
Which laboratory findings support a diagnosis of primary hyperparathyroidism?
Page 6
Answer
The characteristic findings are high serum calcium, low phosphate, and high intact parathyroid hormone (iPTH).
7
Question
Under what drug conditions is therapeutic drug monitoring (TDM) generally not necessary?
Page 6
Answer
TDM is not necessary when there is a long half-life or a poor correlation between plasma concentration and clinical effect.
8
Question
Which physical characteristic of urine is a strong indicator of proteinuria?
Page 6
Answer
Excessive urine foam that does not disappear quickly is a physical indicator of proteinuria.
9
Question
What are the primary hormonal characteristics of Conn's syndrome (Primary Hyperaldosteronism)?
Page 6
Answer
Primary hyperaldosteronism is characterized by high aldosterone levels and low renin levels.
10
Question
What does a high CSF IgG/albumin ratio indicate clinically?
Page 6
Answer
It indicates either blood-brain barrier (BBB) dysfunction or intrathecal IgG synthesis (local antibody production within the CNS).
11
Question
Which autoantibody is the earliest and most common marker for Type 1 Diabetes and LADA?
Page 9
Answer
GADA (Glutamic Acid Decarboxylase Antibody), specifically the GAD65 antibody.
12
Question
The excretion of FIGLU in urine after histidine administration is a marker for which condition?
Page 9
Answer
It is characteristic of anemia caused by folate (Vitamin B9) deficiency.
13
Question
What is serum Cystatin C concentration used to measure clinically?
Page 9
Answer
Cystatin C is a marker used to estimate the glomerular filtration rate (GFR).
14
Question
When is measuring Thyroxine-Binding Globulin (TBG) clinically indicated?
Page 9
Answer
It is indicated to investigate abnormal total T3 or T4 levels in patients suspected of having binding protein abnormalities.
15
Question
Which laboratory test is most specific for diagnosing celiac disease?
Page 9
Answer
The test for antibodies against tissue transglutaminase (tTG).
16
Question
Identify the false statement regarding liver markers: ALT is a marker of cholestasis. Why is this false?
Page 11
Answer
ALT (Alanine Aminotransferase) is a marker of hepatocyte damage (necrosis/inflammation), not cholestasis (bile flow obstruction).
17
Question
What is the main clinical utility of the TRH stimulation test?
Page 11
Answer
It is used to distinguish between secondary (pituitary) and tertiary (hypothalamic) hypothyroidism.
18
Question
Which laboratory test is used to support a diagnosis of malabsorption syndrome?
Page 11
Answer
The measurement of D-xylose concentration in the urine after an oral load.
19
Question
What lipid profile characterizes 'atherogenic dyslipidaemia'?
Page 11
Answer
It consists of high triglycerides (TG), low HDL-cholesterol, and high (often small dense) LDL-cholesterol.
20
Question
Name a pair of tumor markers that demonstrate high organ specificity.
Page 11
Answer
PSA (Prostate Specific Antigen) and thyroglobulin (specific to the thyroid).
21
Question
What is the clinical significance of haptoglobin measurement in laboratory medicine?
Page 12
Answer
Haptoglobin is a laboratory indicator of erythrocyte breakdown (hemolysis).
22
Question
Which urine and fecal results are characteristic of complete obstruction of the bile ducts?
Page 12
Answer
Increased urine bilirubin, decreased urine urobilinogen, and decreased fecal urobilinogen.
23
Question
What is the expected result of a low-dose dexamethasone suppression test in a healthy individual?
Page 12
Answer
A decrease in serum cortisol concentration in the morning sample compared to the nighttime/baseline concentration.
24
Question
Analyze these blood gas results: pH 7.2, \(pCO_2\) 55 mmHg, \(HCO_3^-\) 24 mmol/L. What is the diagnosis?
Page 12
Answer
Respiratory acidosis without metabolic compensation.
25
Question
Define the blood gas characteristics of a 'compensated' acid-base disorder.
Page 12
Answer
The pH is within the normal range (7.35-7.45), while both \(pCO_2\) and \(HCO_3^-\) are abnormal in the same direction.
26
Question
What does a normal APTT allow clinicians to differentiate between in a patient with bleeding?
Page 13
Answer
It differentiates between platelet/vascular disorders and plasma (coagulation factor) disorders.
27
Question
What characterizes the fluid compartment changes in hypertonic dehydration?
Page 13
Answer
There is a decreased volume in both the intracellular and extracellular compartments.
28
Question
What plasma changes are typical for primary hyperaldosteronism?
Page 13
Answer
Decreased potassium (\(K^+\)), decreased chloride (\(Cl^-\)), and increased bicarbonate (\(HCO_3^-\)).
29
Question
Which parameter is most useful for distinguishing MODY from Type 1 Diabetes (T1DM)?
Page 13
Answer
C-peptide concentration is the distinguishing parameter.
30
Question
Which enzymes are the most useful markers for assessing hepatocyte damage?
Page 13
Answer
ALT (Alanine Aminotransferase) and AST (Aspartate Aminotransferase).