Laboratory Reference Intervals Quiz
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Questions and Answers

What is the conventional unit reference interval for Amylase?

  • 0.57 to 1.2 µkat/L
  • 10–80 mcg/dL
  • 60–120 Somogyi units/dL (correct)
  • 4-36 U/L

    • What does the aPTT range indicate for patients receiving anticoagulant therapy?

  • Should not exceed 80 mcg/dL
  • Should be between 4-36 U/L
  • Should be 1.5–2.5 times the control value (correct)
  • Should be below 30 sec

    • What is the normal reference interval for Total Bilirubin?

  • 0.2 - 0.8 mg/dL
  • 0.3 - 1.0 mg/dL (correct)
  • 10–80 mcg/dL
  • 3.5 - 5.0 g/dL

    • Which test has a reference interval of 3.5 - 5.0 g/dL?

    <p>Albumin</p> Signup and view all the answers

    What should be the action taken when bacteremia is suspected?

    <p>Start antibiotics immediately after obtaining blood cultures</p> Signup and view all the answers

    What is the normal range for arterial pH?

    <p>7.35 - 7.45</p> Signup and view all the answers

    What is the bicarbonate (HCO3) normal range in mEq/L?

    <p>21 - 28 mEq/L</p> Signup and view all the answers

    What is the peak therapeutic range for Vancomycin?

    <p>20 - 40 mcg/mL</p> Signup and view all the answers

    What is the normal range for Blood Urea Nitrogen (BUN)?

    <p>10 - 20 mg/dL</p> Signup and view all the answers

    What level of Phenobarbital is considered dangerous?

    <blockquote> <p>40 mcg/mL</p> </blockquote> Signup and view all the answers

    What is the threshold level for toxic salicylate levels?

    <blockquote> <p>300 mcg/mL</p> </blockquote> Signup and view all the answers

    What is the normal range for calcium levels in mg/dL?

    <p>9.0 - 10.5 mg/dL</p> Signup and view all the answers

    What is the reference interval for Ammonia in mcg/dL?

    <p>10–80 mcg/dL</p> Signup and view all the answers

    Which of the following is the conventional unit reference interval for albumin?

    <p>3.5-5.0 g/dL</p> Signup and view all the answers

    What is the reference interval for direct bilirubin in mg/dL?

    <p>0.1 - 0.3 mg/dL</p> Signup and view all the answers

    What indicates that a blood culture result is negative?

    <p>No growth</p> Signup and view all the answers

    What is the reference interval for aspartate aminotransferase (AST) in U/L?

    <p>0-35 U/L</p> Signup and view all the answers

    What is the normal venous pH range?

    <p>7.31-7.41</p> Signup and view all the answers

    What is the normal range for arterial PCO2 levels?

    <p>35-45 mm Hg</p> Signup and view all the answers

    What would be considered a peak level for Tobramycin?

    <p>5-10 mcg/mL</p> Signup and view all the answers

    At what level is Valproic Acid considered toxic?

    <blockquote> <p>100 mcg/mL</p> </blockquote> Signup and view all the answers

    What is the reference range for Carboxyhemoglobin (COHb) in nonsmokers?

    <p>0.01 𝛍𝛍mol/24 hr</p> Signup and view all the answers

    What is the normal range for Phenobarbital levels?

    <p>10 - 30 mcg/mL</p> Signup and view all the answers

    What is the standard Bicarbonate (HCO3) range in mmol/L?

    <p>21-28 mmol/L</p> Signup and view all the answers

    What is the acceptable range for arterial PO2 values?

    <p>80-100 mm Hg</p> Signup and view all the answers

    Study Notes

    Laboratory Reference Intervals

    • Activated partial thromboplastin time (aPTT):
      • 30-40 seconds (30-40 seconds)
      • For patients on anticoagulant therapy, aPTT is 1.5-2.5 times the control value in seconds.
    • Alanine aminotransferase (ALT):
      • 4-36 U/L (4-36 U/L)
    • Albumin:
      • 3.5-5.0 g/dL (35-50 g/L)
    • Ammonia:
      • 10-80 mcg/dL (6–47 mcmol/L)
    • Amylase:
      • 60-120 Somogyi units/dL (0.57 to 1.2 μkat/L)
    • Aspartate aminotransferase (AST):
      • 0-35 U/L (0-35 U/L)
    • Bilirubin (Total):
      • 0.3 - 1.0 mg/dL (5.1 - 17 mcmol/L)
    • Bilirubin (Indirect):
      • 0.2 - 0.8 mg/dL (3.4 - 12 mcmol/L)
    • Bilirubin (Direct):
      • 0.1 - 0.3 mg/dL (1.7 - 5.1 mcmol/L)

    Additional Information (Page 2)

    • Blood Culture:
      • No growth = negative
      • Bacteremia: bacteria in blood; antibiotics should be started immediately after blood culture collection.
    • Blood Gases:
      • Arterial pH: 7.35-7.45
      • Venous pH: 7.31-7.41
      • PCO2: 35-45 mm Hg
      • PO2: 80-100 mm Hg
      • Venous PvO2: 40-50 mm Hg
      • Bicarbonate (HCO3): 21-28 mEq/L (21-28 mmol/L)
    • Blood Urea Nitrogen (BUN):
      • 10 - 20 mg/dL (3.6 - 7.1 mmol/L)

    Additional Information (Page 3)

    • Chloride:
      • 98-106 mEq/L (98-106 mmol/L)
    • Cholesterol:
      • <200 mg/dL (<5 mmol/L), age-dependent
    • Creatine Kinase (CK):
      • Male: 55-170 U/L (55-170 U/L)
      • Female: 30-135 U/L (30-135 U/L)
    • CK-MB:
      • Male: 2 - 6 ng/mL (2 - 6 mcg/L)
      • Female: 2 -5 ng/mL (2 - 5 mcg/L)
    • Creatinine:
      • Male: 0.6-1.2 mg/dL (53-106 mcmol/L)
      • Female: 0.5-1.1 mg/dL (44-97 mcmol/L)
    • Creatinine Clearance: Values vary by age, sex, and other factors.

    Additional Information (Page 4)

    • D-dimer:
      • <0.50 mg/L of fibrinogen equivalent units (FEU)
    • ESR (Westergren):
      • Male: ≤15 mm/hr
      • Female: ≤20 mm/hr
    • Ferritin:
      • Male: 12-300 ng/mL (12-300 mcg/L)
      • Female: 10-150 ng/mL (10-150 mcg/L)
    • Fibrinogen:
      • 200-400 mg/dL (2-4 g/dL)
    • Glucose (fasting adult):
      • 70-99 mg/dL (3.9-5.5 mmol/L), fasting
    • Glucose (infant):
      • 40-90 mg/dL (2.2-5.0 mmol/L)
    • GFR:

      • 60 mL/min/1.73 m² (age-dependent)

    • HDL:

      • 60 mg/dL (>1.55 mmol/L)

    • Hematocrit: Values vary by sex and pregnancy status.

    Additional Information (Page 5)

    • Hemoglobin:
      • Male: 14-18 g/dL (140-180 g/L)
      • Female: 12-16 g/dL (120-160 g/L)
    • HbA1c (glycated hemoglobin):
      • <6% (adults without diabetes)
      • Good diabetic control <7%
    • Homocysteine: Levels depend on gender and age.
    • INR:
      • 0.81-1.2 (0.81-1.2)
    • Lactic Acid:
      • Venous: 5-20 mg/dL (0.6–2.2 mmol/L)
      • Arterial: 3-7 mg/dL (0.3 - 0.8 mmol/L)
    • LDH:
      • 100-190 U/L (100-190 units/L) (adult)
      • Other age-specific values exist.
    • LDL:
      • <100 mg/dL (<2.59 mmol/L)
    • Lipase:
      • 0-160 U/L (0-160 U/L)
    • Magnesium:
      • 1.8-2.6 mg/dL (0.74-1.07 mmol/L)
    • Myoglobin:
      • <90 ng/mL (1.0-5.3 nmol/L)
    • MCV:
      • Adult/elderly/child: 80-95 fL
      • Newborn: 96-108 fL

    ... (rest of the updated study notes)

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    Common Laboratory Reference Intervals January 2024 PDF

    Description

    Test your knowledge on laboratory reference intervals, including values for aPTT, ALT, and bilirubin. This quiz will challenge your understanding of important laboratory tests and their clinical significance. Ideal for medical students and healthcare professionals.

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