Clinical biochemistry (Lec 7) (Set 1)
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Clinical biochemistry (Lec 7) (Set 1)

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Questions and Answers

Which term is another name for Clinical Biochemistry?

  • Chemical Pathology (correct)
  • Haematology
  • Blood Sciences
  • Clinical Chemistry

    • What are the main purposes of clinical biochemistry tests?

  • Diagnosis and monitoring of treatment
  • Monitoring of treatment and prognosis
  • Disease screening and prognosis
  • Diagnosis and disease screening (correct)

    • What type of specimens are commonly used for clinical biochemistry tests?

  • Serum and plasma (correct)
  • Faeces and cerebrospinal fluid
  • Sweat and saliva
  • Urine and arterial blood

    • What is the purpose of a preservative in a urine specimen for biochemical analysis?

    <p>To stabilize certain metabolites</p> Signup and view all the answers

    What is the correct process for a clinical biochemistry test request?

    <p>Provide the correct specimen and a completed form</p> Signup and view all the answers

    What do clinical biochemistry tests measure?

    <p>Quantitative changes in body fluids</p> Signup and view all the answers

    Which disease is associated with a raised blood sugar due to lack of insulin?

    <p>Diabetes mellitus</p> Signup and view all the answers

    What is the purpose of clinical biochemistry tests in relation to heart attack?

    <p>To measure cardiac biomarkers</p> Signup and view all the answers

    Which of the following is NOT a specimen commonly used for biochemical analysis?

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

    What is the purpose of bar coding in clinical biochemistry tests?

    <p>To ensure correct sample identification</p> Signup and view all the answers

    Which of the following best defines precision in analytical testing?

    <p>The reproducibility of test results</p> Signup and view all the answers

    What is the purpose of internal quality assurance samples in a laboratory?

    <p>To monitor the performance of the assay</p> Signup and view all the answers

    What percentage of the normal population is expected to fall outside the reference range?

    <p>5%</p> Signup and view all the answers

    Which of the following is an example of a false positive result?

    <p>A result outside the reference range, but the person is healthy</p> Signup and view all the answers

    Which of the following can affect the interpretation of biochemical results?

    <p>All of the above</p> Signup and view all the answers

    What is the purpose of point-of-care testing?

    <p>To provide rapid reassurance or further investigations</p> Signup and view all the answers

    What are some potential problems with biochemical specimens?

    <p>All of the above</p> Signup and view all the answers

    Which of the following is considered a core biochemical test?

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

    What are some examples of specialized tests in laboratory analysis?

    <p>All of the above</p> Signup and view all the answers

    What is the purpose of external quality assurance samples in a laboratory?

    <p>To compare test results with other laboratories</p> Signup and view all the answers

    Clinical Biochemistry lab is also known as chemical pathology and clinical chemistry.

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

    Discretionary or selective requesting by doctors is based on patient's symptoms, signs, and previous history.

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

    Blood clot is collected into blood specimen tubes depending on the requested test.

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

    Urine specimen requires a preservative to inhibit bacterial growth or acid to stabilize certain metabolites.

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

    Clinical biochemistry tests measure changes in chemical composition of body fluids quantitatively.

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

    Precision refers to how close the measured value is to the actual value.

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

    Sensitivity is a measure of how well the assay can detect very small amounts of the analyte.

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

    Quality assurance in the lab can be ensured by comparing test results to monitor performance.

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

    The reference range chosen for a specific analyte includes 99% of the values found in healthy volunteers.

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

    False positives occur when a result falls outside the reference range, but the person is healthy and within the 5% excluded in the reference range.

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

    Study Notes

    Clinical Biochemistry Lab

    • Also known as chemical pathology and clinical chemistry, applying chemical and biochemical methods to study disease.

    Samples

    • Tests are needed for diagnosis, monitoring treatment, disease screening, and prognosis.
    • Samples are usually serum from venous blood or urine.
    • Blood is collected into blood specimen tubes depending on the requested test.
    • Serum is obtained by centrifuging blood without an anticoagulant.
    • Plasma is obtained by centrifuging blood with an anticoagulant.

    Biochemical Analyses

    • Other specimens used include urine, arterial blood, faeces, cerebrospinal fluid, sweat, and saliva.

    Processing a Request

    • Correct specimen and completed clinical biochemistry form are required.
    • Appropriate information ensures correct test and patient identification.
    • Bar coding ensures correct sample identification.
    • Automated analysis provides results with minimum delay.

    Clinical Biochemistry Process

    • The laboratory process involves receiving the specimen, analyzing the sample, and returning results to the clinician.

    Clinical Biochemistry Test Results

    • Diseases cause significant changes in body fluid chemical composition.
    • Tests measure these changes quantitatively, such as:
      • Raised blood sugar in diabetes mellitus due to lack of insulin.
      • Raised blood cardiac biomarkers due to their release from heart muscle after a heart attack.

    Precision and Accuracy

    • Precision refers to reproducibility.
    • Accuracy refers to how close the measured value is to the actual value.

    Analytical Sensitivity and Specificity

    • Sensitivity refers to the minimum amount of analyte detectable by the assay.
    • Specificity refers to the assay's ability to distinguish between the requested analyte and other substances.

    Quality Assurance

    • Internal quality assurance involves daily or every-test quality control samples.
    • External quality assurance involves distributing identical samples to several labs for comparison.

    Reference Intervals/Ranges

    • Reference ranges are chosen to include 95% of healthy volunteer values.
    • 5% of the normal population will be outside the reference range.
    • Reference ranges vary slightly according to source or lab.

    False Positives and False Negatives

    • False positive: result outside the reference range, but person is healthy.
    • False negative: patient has the disease, but gives a 'normal' result.

    Biological Factors Affecting Interpretation

    • Different reference ranges for genetically male and female individuals, depending on age, pregnancy, diet, time of day, and other factors.

    Point of Care Testing

    • Rapid reassurance or further investigations convenient and clinically meaningful.
    • Range of analytes includes glucose, protein, cholesterol, urea, and creatinine, among others.

    Problems with Biochemical Specimens

    • Difficult blood sampling, insufficient specimen, errors in timing, and incorrect specimen container or storage can affect results.

    Core Biochemical Tests

    • Us & Es (Urea and creatinine & Electrolytes): sodium, potassium, chloride, bicarbonate, calcium, and phosphate.
    • LFTs (Liver function tests): Alkaline phosphatase; alanine amino transferase; bilirubin; albumin.
    • Thyroxine and thyroid stimulating hormone, H+, pCO2, pO2 (blood gases), and glucose.

    Specialised Tests

    • Specialised techniques (not offered by every hospital) include trace elements, hormones, specific proteins (e.g., tumour markers), and DNA analysis.

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    Related Documents

    Biol 131 L7.pdf

    Description

    Test your knowledge of clinical biochemistry and its importance in diagnosing and monitoring diseases. Learn why doctors request specific tests based on patient symptoms, signs, and medical history.

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