Collection, Processing, and Biochemical Examination of Blood, Urine, and Other Clinical Specimens Practical Enzymology: Enzyme Estimation, Activity Measurement, and Kinetic Analysis
Updated: Aug 29
| Cerebral Link | Publish by Cerebral Publication Private Limited | 2026 | Volume 3 | Page 83-95 | ISBN: 978-81-689463-5-4 | Book Title: - Textbook of Practical Biochemistry | Chapter- 6: Collection, Processing, and Biochemical Examination of Blood, Urine, and Other Clinical Specimens Practical Enzymology: Enzyme Estimation, Activity Measurement, and Kinetic Analysis
Abstract
Accurate biochemical investigation begins with appropriate collection, handling, processing, preservation, and examination of clinical specimens. Pre-analytical errors can significantly influence laboratory results and may compromise diagnostic interpretation, making standardized specimen-management practices essential in clinical biochemistry. This chapter provides a practical overview of the collection and biochemical examination of blood, urine, and other commonly encountered biological specimens. It describes procedures for venous and capillary blood collection, selection of serum or plasma, use of appropriate anticoagulants and collection tubes, centrifugation, separation, labeling, transportation, storage, and preservation. The principles of urine collection, including random, early-morning, timed, and 24-hour specimens, are discussed along with their applications in biochemical analysis. Basic considerations for cerebrospinal fluid and other body fluids are also introduced.
The chapter emphasizes pre-analytical variables such as fasting status, collection time, posture, exercise, medication, hemolysis, lipemia, contamination, improper storage, and delays in processing that may alter biochemical measurements. Routine biochemical examination of specimens is discussed in relation to clinically important analytes, including glucose, proteins, electrolytes, metabolites, enzymes, and other diagnostic biomarkers. Specimen acceptance and rejection criteria, biosafety precautions, infection-control measures, documentation, and quality assurance are also addressed. Particular attention is given to correct patient identification and prevention of specimen mix-ups. Understanding these principles enables students and laboratory personnel to minimize pre-analytical errors, improve analytical reliability, and generate clinically meaningful biochemical results while maintaining patient and laboratory safety.
Keywords: Clinical Specimens, Blood Collection, Urine Analysis, Sample Processing, Clinical Biochemistry, Pre-analytical Errors, Biosafety, Quality Assurance
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