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**Overview**: Vitamin D Screen Panel**Introduction**: The Vitamin D Screen Panel is a diagnostic tool designed for vitamin D deficiency screening using serum samples. In India, vitamin D deficiency affects ~70-90 percent of the population (higher in rural/low-SES, veiled women, elderly due to limited sun exposure, dark skin, malnutrition), contributing to rickets in children, osteomalacia/osteoporosis in adults, and increased risk of infections/autoimmunity. High morbidity from under-testing leading to delayed supplementation, causing bone pain, fractures, or muscle weakness. Per endocrinology practices aligned with ICMR, Endocrine Society of India, and National Nutrition Monitoring Bureau guidelines, the test employs immunoassay for 25-OH vitamin D and calcium over 1â€"2 days with high accuracy, valuable for diagnosing deficiency (<20 ng/mL severe) and monitoring replacement. This diagnostic falls under nutritional screening and targets patients with bone pain, fatigue, pregnancy, or high-risk groups, addressing accurate detection to guide cholecalciferol supplementation. With elevated morbidity due to underdiagnosis, the test supports public health efforts by enabling early vitamin D profiling and reducing skeletal complications. Its serum-based approach ensures reliable 25-OH vitamin D measurement.**Other Names**: Vit D Screen Pnl.**FDA Status**: FDA approved, CLIA certified for biochemistry/endocrinology, compliant with 2025 standards.**Historical Milestone**: 25-OH vitamin D standard for deficiency screening; in India, core of nutritional programs.**Purpose**: The test assesses 2 parameters including 25-OH Vitamin D to guide vitamin D deficiency screening, detect low levels, inform supplementation.**Test Parameters**: 1. 25-OH Vitamin D, 2. Calcium.**Pretest Condition**: Fasting 10-12 hours recommended; patients should have deficiency symptoms.**Specimen**: 3 mL serum in 1 SST, 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 bone pain, sun exposure.**Consent**: Written informed consent is required, detailing the test's purpose, potential risks of undetected deficiency including osteomalacia, benefits of screening, and minimal discomfort from venipuncture.**Procedural Considerations**: The test involves sample processing using immunoassay by trained personnel to ensure sterile technique, avoid hemolysis, and interpret results within 1â€"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 can affect results. Correlation with clinical evaluation or additional testing is recommended to confirm findings.**Clinical Significance**: Low 25-OH vitamin D (<20 ng/mL) indicates deficiency, necessitating specialist input.**Specialist Consultation**: Endocrinologists should be consulted for management.**Additional Supporting Tests**: PTH, alkaline phosphatase for confirmation.**Test Limitations**: Seasonal variation; comprehensive approach required.**References**: Indian Journal of Endocrinology 2024, Nutrition Studies India 2023. |
