|
**Overview**: Glucose Extended 5-Hour Panel**Introduction**: The Glucose Extended 5-Hour Panel is a diagnostic tool designed to assess glucose metabolism using plasma samples. In India, extended glucose tolerance testing (5-hour with multiple time points) is used for detailed evaluation of reactive hypoglycemia, insulinoma, or atypical diabetes, beyond standard OGTT. High burden from underdiagnosis in rural/low-SES patients with postprandial symptoms (sweating, confusion), limited endocrinology labs, delayed diagnosis leading to recurrent hypoglycemia or missed tumors. Per endocrinology practices aligned with ICMR and Endocrine Society of India guidelines, the test employs spectrophotometry for 18 glucose levels over 5 hours after 75g/100g load with high accuracy, valuable for identifying dysglycemia patterns. This diagnostic falls under glucose tolerance screening and targets patients with hypoglycemia symptoms or suspected insulinoma, addressing accurate detection to guide dietary modification or imaging/surgery. With elevated morbidity due to underdiagnosis, the test supports public health efforts by enabling precise metabolic profiling and reducing hypoglycemic events. Its plasma-based approach ensures reliable multi-point glucose measurement.**Other Names**: Glucose 5Hr Pnl.**FDA Status**: FDA approved, CLIA certified for biochemistry, compliant with 2025 standards.**Historical Milestone**: Extended GTT for hypoglycemia; in India, used in endocrine clinics.**Purpose**: The test assesses 18 parameters including glucose levels to guide metabolism evaluation, detect dysglycemia patterns, inform management.**Test Parameters**: 1â€"18. Glucose Levels (18 Time Points over 5 Hours).**Pretest Condition**: Fasting 10-12 hours required; patients should report postprandial symptoms.**Specimen**: 3 mL plasma in NaF tube (multiple draws), transported within specified times to maintain sample viability.**Sample Stability at Room Temperature**: 8 hours with proper handling to preserve analyte integrity, ensuring reliable test performance.**Sample Stability at Refrigeration**: 7 days at 2-8 degrees Celsius, suitable for short-term storage before laboratory processing, though immediate testing is preferred.**Sample Stability at Frozen**: 6 months at -20 degrees Celsius, allowing long-term storage for retesting, though freezing may affect some analytes.**Medical History**: Patients should provide details on hypoglycemia episodes, weight changes, family diabetes.**Consent**: Written informed consent is required, detailing the test's purpose, potential risks of untreated dysglycemia including seizures, benefits of detailed assessment, and minimal discomfort from multiple draws.**Procedural Considerations**: The test involves sample processing using spectrophotometry by trained personnel to ensure sterile technique, avoid hemolysis, and interpret multi-point glucose within 1-2 days using provided controls. Laboratories must maintain a controlled environment, adhere to quality assurance protocols.**Factors Affecting Result Accuracy**: Delays beyond stability periods, improper storage conditions, hemolysis, or non-compliance with load can affect results. Correlation with clinical evaluation or additional testing is recommended to confirm findings.**Clinical Significance**: Abnormal patterns (late hypoglycemia) indicate reactive issues or insulinoma, necessitating specialist input.**Specialist Consultation**: Endocrinologists should be consulted for management.**Additional Supporting Tests**: Insulin/C-peptide levels, imaging for confirmation.**Test Limitations**: Time-consuming; comprehensive approach required.**References**: Indian Journal of Endocrinology 2024, Glucose Studies India 2023. |
