Clinical Chemistry Reviewer for MTLE Philippines 2026
By LisensyaPrep Team | Last Updated: April 2026 | 11-minute read
Clinical Chemistry is one of the largest and most technically demanding subjects in the Medical Technologist Licensure Examination. It covers the biochemical analysis of blood and other body fluids to diagnose and monitor disease states.
What makes clinical chemistry manageable for the MTLE is that the same core principles apply across most analytes: you need to know the normal reference range, what causes values to increase, what causes values to decrease, and the clinical significance of abnormal results. Build that framework for each analyte and you have covered the majority of what the exam tests.
Carbohydrates: Glucose Metabolism and Diabetes
Glucose Reference Values
| Test | Normal Value | Clinical Use |
|---|
|------|-------------|--------------|
| Fasting Blood Glucose | 70 to 100 mg/dL | Diabetes screening |
| 2-hour postprandial glucose | Less than 140 mg/dL | Diabetes monitoring |
| Random blood glucose | Less than 200 mg/dL | Symptomatic diabetes diagnosis |
| HbA1c | Less than 5.7% | Long-term glucose control (past 2 to 3 months) |
Diagnosis of Diabetes Mellitus
Any one of the following criteria confirms diabetes:
Pre-diabetes values: Fasting glucose 100 to 125 mg/dL (impaired fasting glucose) or HbA1c 5.7 to 6.4%.
Glucose Tolerance Test (GTT)
The GTT is most commonly used to diagnose gestational diabetes. The patient fasts for 8 to 12 hours, a fasting blood glucose is drawn, then 75g of glucose solution is consumed, and blood glucose is measured at 1 and 2 hours.
MTLE important point: GTT specimens must be processed immediately. Glucose is metabolized by red blood cells at approximately 10 mg/dL per hour at room temperature. Use sodium fluoride tubes (gray top) to inhibit glycolysis and preserve glucose levels.
Lipids and Lipoproteins
Ad
Leaderboard
Liver Function Tests
The liver produces proteins, metabolizes drugs, and processes bilirubin. Liver function tests (LFTs) assess different aspects of liver health.
Bilirubin
Total bilirubin normal: 0.2 to 1.2 mg/dL
Direct (conjugated) bilirubin: Bilirubin that has been processed by the liver. Elevated in obstructive jaundice and hepatocellular disease.
Indirect (unconjugated) bilirubin: Bilirubin not yet processed. Elevated in hemolytic disease, neonatal jaundice, and Gilbert syndrome.
Types of jaundice by bilirubin pattern:
Pre-hepatic (hemolytic) jaundice: Elevated indirect bilirubin. Urine is dark (urobilinogen elevated), stool is normal color.
Hepatic (hepatocellular) jaundice: Both direct and indirect bilirubin elevated. Seen in hepatitis and cirrhosis.
Post-hepatic (obstructive) jaundice: Elevated direct bilirubin. Pale stools (no bilirubin reaching gut), dark urine (bilirubin excreted by kidneys).
Liver Enzymes
ALT (Alanine Aminotransferase): More specific to the liver than AST. Markedly elevated in viral hepatitis. Normal: 7 to 56 U/L.
AST (Aspartate Aminotransferase): Found in liver, heart, skeletal muscle, and red blood cells. Less liver-specific. Normal: 10 to 40 U/L.
AST:ALT ratio: Ratio greater than 2:1 suggests alcoholic liver disease. In viral hepatitis, ALT is typically higher than AST.
ALP (Alkaline Phosphatase): Elevated in obstructive liver disease and bone disorders. Normal: 44 to 147 U/L.
GGT (Gamma-Glutamyl Transferase): Sensitive marker for alcohol use. Also elevated in obstructive liver disease and with enzyme-inducing drugs.
Protein Tests
Total protein normal: 6.0 to 8.0 g/dL. Includes albumin and globulin.
Albumin normal: 3.5 to 5.0 g/dL. Produced exclusively by the liver. Long half-life (20 days), so low albumin reflects chronic liver dysfunction. Used to calculate osmotic pressure.
Prothrombin Time (PT): Clotting factors II, V, VII, X are made by the liver. Prolonged PT in liver disease indicates impaired synthetic function.
Renal Function Tests
Creatinine and Blood Urea Nitrogen
Creatinine: Waste product of muscle metabolism, freely filtered by the kidneys. More specific for kidney function than BUN because it is not affected by diet.
Normal: 0.6 to 1.2 mg/dL (higher in males due to greater muscle mass)
Elevated in: Acute kidney injury, chronic kidney disease, rhabdomyolysis
Blood Urea Nitrogen (BUN): Urea is the end product of protein metabolism. Affected by protein intake, hydration status, and catabolic states, making it less specific for kidney function than creatinine.
Normal: 7 to 20 mg/dL
BUN:Creatinine Ratio: Normal is 10:1 to 20:1.
Glomerular Filtration Rate (GFR)
GFR estimates how well the kidneys filter waste per minute. It is calculated using creatinine, age, sex, and race.
Normal GFR is greater than 90 mL/min/1.73m².
Chronic kidney disease is classified by GFR stage from G1 (normal or mildly reduced) to G5 (kidney failure, GFR less than 15).
Quality Control in the Clinical Chemistry Laboratory
Quality control is a consistent source of MTLE questions because it tests your understanding of laboratory operations, not just clinical knowledge.
Accuracy refers to how close a measured value is to the true value. Measured by comparing results to certified reference materials.
Precision refers to the reproducibility of results. A method is precise if repeated measurements give the same result even if that result is not accurate.
Levey-Jennings Chart is used to plot quality control results over time. Control values should fall within 2 standard deviations of the mean 95.5% of the time.
Westgard Rules are a set of decision rules used to interpret QC data and determine whether an analytical run should be accepted or rejected.
The most important Westgard rules for the MTLE:
1-2s rule: Warning rule. One control value exceeds 2 standard deviations. Does not require rejection alone.
1-3s rule: Rejection rule. One control value exceeds 3 standard deviations. Reject the run.
2-2s rule: Rejection rule. Two consecutive control values exceed 2 standard deviations on the same side of the mean.
R-4s rule: Rejection rule. The range between two control values within a run exceeds 4 standard deviations.
Clinical chemistry questions in the MTLE combine knowledge of reference values, clinical interpretation, and laboratory technique. Practice questions that require you to interpret abnormal results and identify the appropriate next action.
Head to LisensyaPrep and practice now. No registration required.
Ready to Test Your Knowledge?
Practice MTLE clinical chemistry questions with instant feedback. No registration required.
Start MTLE Practice at LisensyaPrep →Ad
Leaderboard