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Key Facts: Thai MedTech License Exam
60% pass mark
Minimum passing score required per component under Medical Technology Council rules
Medical Technology Council Licensing Regulations
7 core domains
Laboratory disciplines evaluated across the two national licensing examination sessions
MTC Licensing Blueprint
B.E. 2547
Year of enactment of the Medical Technology Profession Act establishing the Council
Royal Thai Government Gazette
5 years
Statutory validity duration of the professional medical technologist license
Medical Technology Council Licensing Guidelines
CMTE required
Continuing Medical Technology Education credits mandated for five-year license renewal
MTC CMTE Regulations
Independent practice by OpenExamPrep for the Thai Medical Technology Council License: an English-language MCQ study adaptation covering clinical chemistry, medical microbiology, hematology, immunohematology, serology, microscopy, and Thai health law. It is an independent study tool, not an official examination translation.
Sample Thai MedTech License Practice Questions
Try these sample questions to review concepts for the Thai MedTech License exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.
1According to the Beer-Lambert law, what happens to transmittance when the concentration of a light-absorbing analyte in a spectrophotometer cuvette is doubled, assuming path length and molar absorptivity remain constant?
A.The new fractional transmittance equals the square of the original fractional transmittance
B.Transmittance decreases by exactly 50%
C.Transmittance increases proportionally
D.Transmittance remains unchanged while absorbance doubles
Explanation: Beer–Lambert behavior gives A = εbc and T = 10^(−A), where T is fractional transmittance. Doubling concentration doubles absorbance, so T_new = 10^(−2A) = T_original². Transmittance therefore decreases exponentially with concentration, while absorbance varies linearly.
2In clinical enzymology, which kinetic condition must be maintained during a zero-order enzyme activity assay to ensure that the measured reaction rate is directly proportional to enzyme concentration?
A.Substrate must be present in a large, saturating excess relative to Km
B.Enzyme concentration must greatly exceed substrate concentration
C.Substrate concentration must equal the Michaelis constant (Km)
D.Co-factor concentrations must be kept at rate-limiting levels
Explanation: An enzyme activity assay uses saturating substrate and sufficient cofactors so that the measured initial rate is approximately independent of substrate concentration. Under these controlled conditions, the rate is proportional to the amount of active enzyme. The exact reagent concentrations are assay-specific rather than one mandatory multiple of Km for every enzyme.
3A 58-year-old patient presents to the emergency department with acute crushing chest pain that began 48 hours ago. Which cardiac biomarker remains elevated and provides the highest clinical sensitivity and specificity for confirming an acute myocardial infarction at this time point?
A.Cardiac Troponin I (cTnI)
B.Creatine kinase MB isoenzyme (CK-MB)
C.Myoglobin
D.Lactate dehydrogenase isoenzyme 1 (LD-1)
Explanation: Cardiac troponin is the preferred biomarker for myocardial injury and commonly remains elevated at this time point. Myocardial infarction is diagnosed from a rise or fall in troponin together with evidence of ischemia, such as the clinical presentation, ECG, or imaging. An elevated troponin alone is not specific for infarction, and the detection window depends on the assay and injury.
4An arterial blood gas (ABG) sample drawn on room air shows: pH 7.26 (ref: 7.35–7.45), pCO2 28 mmHg (ref: 35–45), HCO3- 12 mmol/L (ref: 22–26), and pO2 94 mmHg. Which acid-base disorder is represented by these laboratory findings?
A.Metabolic acidosis with respiratory compensation in the expected range
B.Respiratory acidosis with partial renal compensation
C.Metabolic alkalosis with respiratory compensation
D.Uncompensated respiratory acidosis
Explanation: Acidemia with low bicarbonate identifies metabolic acidosis. Winter's estimate gives an expected PaCO2 of 1.5 × 12 + 8 ± 2 = 24–28 mmHg, so 28 mmHg is within the expected respiratory compensation range. Appropriate compensation does not require the pH to return to normal.
5A patient with severe hypertriglyceridemia (triglycerides 2,400 mg/dL) has a serum sodium reported as 122 mmol/L on an indirect ion-selective electrode (ISE) analyzer. When reanalyzed on a point-of-care direct ISE blood gas instrument, the sodium is 138 mmol/L. What mechanism accounts for this discrepancy?
A.Electrolyte exclusion effect causing pseudohyponatremia due to expanded lipid fraction
B.Inhibition of the ion-selective glass membrane by circulating chylomicrons
C.Turbidity interference affecting the direct potentiometric reference electrode junction
D.Osmotic fluid shifting from intracellular spaces driven by excess triglycerides
Explanation: Indirect ISE requires pre-analytical sample dilution and assumes plasma is composed of 93% aqueous phase and 7% solid (lipid/protein) phase. When severe hyperlipidemia markedly increases the non-aqueous solid fraction, the aqueous volume pipetted is reduced, leading to an artificially diluted aqueous sodium measurement termed pseudohyponatremia. Direct ISE measures electrolyte activity directly in undiluted plasma water and is unaffected by solid phase expansion.
6In the classic alkaline picrate (Jaffe) method for serum creatinine measurement, which class of compounds is known to produce significant positive analytical interference by reacting directly with alkaline picrate to form a red-orange chromogen?
A.Cephalosporin antibiotics and acetoacetate
B.Unconjugated bilirubin and hemoglobin
C.Bile salts and high-density lipoproteins
D.Tetracycline and loop diuretics
Explanation: The Jaffe reaction involves the formation of a red-orange tautomer of creatinine picrate in alkaline solution. Non-creatinine chromogens such as acetoacetate, acetone, pyruvate, and certain cephalosporin antibiotics (e.g., cefazolin, cefoxitin) cross-react with alkaline picrate, producing falsely elevated creatinine values, particularly in endpoint manual assays.
7A hospitalized patient with severe dehydration demonstrates a serum blood urea nitrogen (BUN) of 54 mg/dL and a serum creatinine of 1.8 mg/dL. What does this BUN-to-creatinine ratio most strongly indicate?
A.Pre-renal azotemia with preserved renal tubular reabsorptive function
B.Intrinsic acute tubular necrosis with tubular epithelial damage
C.Post-renal obstructive uropathy with bilateral ureteral stones
D.Chronic end-stage renal disease with loss of functional nephrons
Explanation: A BUN-to-creatinine ratio greater than 20:1 with elevated BUN and normal or mildly elevated creatinine is characteristic of pre-renal azotemia. Hypoperfusion reduces glomerular filtration rate while enhancing proximal tubular reabsorption of water and urea; creatinine is filtered but not reabsorbed, leading to a disproportionately high BUN relative to creatinine.
8In the Jendrassik-Grof diazo method for bilirubin quantification, what reagent is added to accelerate the reaction of unconjugated (indirect) bilirubin with diazotized sulfanilic acid to yield total bilirubin?
A.Caffeine-sodium benzoate
B.Absolute methanol
C.Sodium potassium tartrate
D.Ascorbic acid
Explanation: In the Jendrassik-Grof method, conjugated (direct) bilirubin reacts readily in aqueous solution with diazotized sulfanilic acid. Unconjugated bilirubin is tightly bound to albumin and requires an accelerator—specifically caffeine-sodium benzoate—to uncouple it from albumin and solubilize it so it can react to yield the total azobilirubin chromogen.
9A 45-year-old patient with long-term heavy alcohol use presents with jaundice. Laboratory evaluation reveals AST 320 U/L (ref: 10–40), ALT 135 U/L (ref: 7–56), and total bilirubin 4.5 mg/dL. Which mechanism can contribute to this AST-predominant pattern in alcohol-associated liver injury?
A.Mitochondrial injury releases AST, while pyridoxal-5'-phosphate deficiency can reduce measured ALT enzyme activity
B.Ethanol selectively stimulates transcription and exocytosis of cytoplasmic AST while inhibiting renal ALT clearance
C.ALT is cleared rapidly by the reticuloendothelial system during chronic alcohol intake
D.Alcoholic hepatitis induces an isoenzyme of AST originating from striated skeletal muscle breakdown
Explanation: Mitochondrial injury can contribute to increased circulating AST in alcohol-associated liver injury. Pyridoxal-5'-phosphate is an aminotransferase cofactor, so deficiency can reduce measured ALT activity; this should not be described simply as impaired enzyme synthesis. The AST/ALT pattern supports the clinical assessment but does not establish the cause of liver disease by itself.
10An adult patient has an isolated total alkaline phosphatase (ALP) of 380 U/L (ref: 40–130 U/L) with normal transaminases. The medical technologist performs heat inactivation at 56°C for 10 minutes, after which residual ALP activity is 12% of the original unheated sample. Gamma-glutamyl transferase (GGT) is within normal limits. What is the most likely source of the elevated ALP?
A.Bone isoenzyme
B.Liver isoenzyme
C.Intestinal isoenzyme
D.Placental isoenzyme (Regan isoenzyme)
Explanation: Alkaline phosphatase isoenzymes exhibit different heat stabilities at 56°C: bone ALP is heat-labile, retaining less than 20% residual activity (mnemonic: 'bone burns'), whereas liver ALP is moderately stable, retaining 25% to 55% activity. Furthermore, GGT is elevated in hepatobiliary disorders but normal in bone diseases (e.g., Paget's disease, osteomalacia), confirming a skeletal origin.
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