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**Overview**: Glucose 2-5-Hour Panel**Introduction**: The Glucose 2-5-Hour Panel is a diagnostic tool designed to assess glucose metabolism using plasma samples. In India, intermediate-duration glucose tolerance testing (2.5-hour with multiple points) evaluates impaired glucose tolerance or reactive hypoglycemia, common in prediabetes (~10-15 percent prevalence) and postprandial syndromes. High morbidity from under-testing in rural/low-SES patients with fatigue or dizziness after meals, limited labs, delayed lifestyle intervention leading to progression to diabetes. Per endocrinology practices aligned with ICMR and RSSDI guidelines, the test employs spectrophotometry for 12 glucose levels over 2.5 hours after load with high accuracy, valuable for detecting early dysglycemia. This diagnostic falls under glucose tolerance screening and targets patients with prediabetes risk or postprandial symptoms, addressing accurate detection to guide diet/exercise or metformin. With elevated morbidity due to underdiagnosis, the test supports public health efforts by enabling precise metabolic assessment and reducing diabetes burden. Its plasma-based approach ensures reliable multi-point measurement.**Other Names**: Glucose 2.5Hr Pnl.**FDA Status**: FDA approved, CLIA certified for biochemistry, compliant with 2025 standards.**Historical Milestone**: Intermediate GTT used; in India, in diabetes clinics.**Purpose**: The test assesses 12 parameters including glucose levels to guide metabolism evaluation, detect impaired tolerance, inform intervention.**Test Parameters**: 1â€"12. Glucose Levels (12 Time Points over 2.5 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 post-meal symptoms, family diabetes, obesity.**Consent**: Written informed consent is required, detailing the test's purpose, potential risks of untreated dysglycemia including diabetes progression, benefits of 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 curves indicate impaired tolerance or hypoglycemia, necessitating specialist input.**Specialist Consultation**: Endocrinologists or diabetologists should be consulted for management.**Additional Supporting Tests**: HbA1c, insulin levels for confirmation.**Test Limitations**: Shorter than full extended; comprehensive approach required.**References**: Indian Journal of Endocrinology 2024, Glucose Studies India 2023. |
