New Born Screening NBS - 111 Conditions On GCMS
Also Known As
Test Parameters Included
- Expanded Newborn Screening Panel — 111 Metabolic Conditions detected by GCMS (Gas Chromatography-Mass Spectrometry)
- Pathologist Molecular Genetics Remark — mapped against age-adjusted newborn reference intervals for each analyte
Department
Methodology
GCMS (Gas Chromatography-Mass Spectrometry) is the primary and highly specialized methodology for this specific newborn screening panel. GCMS is a powerful analytical technique that combines two different methods to identify and quantify specific substances within a complex sample, such as urine. * Gas Chromatography (GC): Separates volatile and semi-volatile compounds in the sample based on their different chemical and physical properties (e.g., boiling point, polarity) as they pass through a capillary column. * Mass Spectrometry (MS): Identifies the separated compounds by measuring their mass-to-charge ratio. Each compound has a unique "fingerprint" spectrum. In the context of newborn screening for metabolic disorders, GCMS is particularly effective for detecting Organic Acidemias (Organic Acidurias). These are a group of inborn errors of metabolism where the body cannot properly break down certain amino acids, fats, or carbohydrates, leading to a buildup of toxic organic acids in the blood and urine. GCMS provides a detailed metabolic profile, identifying the specific organic acids that accumulate, which is crucial for diagnosing these conditions.
Sample Required
Preparation
* Sample Type: Only a urine sample is required for this specific panel. It is often collected in conjunction with the dried blood spot (heel prick) and/or whole blood samples for other comprehensive newborn screening components.
* Timing of Collection: The urine sample can typically be collected any time after the first 24-48 hours of life. The timing should ideally coincide with or follow feeding to ensure an active metabolic state. Follow the specific instructions provided by the healthcare provider or lab for optimal collection window.
* Collection Method: A clean-catch urine sample is essential to avoid contamination. This can be achieved using a sterile urine collection bag designed for infants (attached to the diaper area) or by carefully collecting a mid-stream sample if possible. The sample should be collected in a sterile, leak-proof container provided by the laboratory.
* Adequate Hydration: Ensure the infant is well-hydrated and has passed urine regularly prior to collection. A dilute sample may sometimes lead to false negatives.
* Storage and Transport: Once collected, the urine sample should be stored appropriately (e.g., refrigerated) and transported to the laboratory as quickly as possible, ideally within 24 hours, to ensure metabolite stability. Follow specific laboratory guidelines for sample handling.
* Clinical Information: Provide accurate demographic information for the newborn and parents, feeding status, any medications given to the mother during pregnancy or to the baby, and any relevant clinical observations.
* Follow-up: Parents should be clearly informed about the test's purpose and the process for receiving results, emphasizing the importance of prompt response to any follow-up requests.
Schedule Report
7 Days
Emergency Report
Yes
Frequently Asked Questions
What does the Newborn Screening 111 Conditions GCMS panel test for?
It screens for 111 inherited metabolic disorders including aminoacidopathies, organic acidemias, fatty acid oxidation defects, and other inborn errors of metabolism that can cause severe disability or death if untreated.
Is fasting required for this newborn screening test?
No, fasting is not required. Newborn screening is performed as a routine public health test, typically between 48 hours and 7 days of life, regardless of feeding status.
What sample is collected for this test?
A urine sample is collected from the newborn, usually via a sterile urine collection bag or catheterization, and analyzed using GCMS for metabolic biomarkers.
How long does it take to get the results?
Results are typically available within 3 to 7 working days, as GCMS analysis of 111 metabolic conditions requires specialized processing and pathologist review.
Can medications or stress affect the newborn screening results?
Certain medications, infections, or metabolic stress in the newborn can temporarily alter metabolite levels. The pathologist interprets results in clinical context, and repeat testing may be advised if borderline findings are seen.
What happens if a screening result is abnormal?
An abnormal result does not confirm a diagnosis. It triggers a referral to a pediatric metabolic specialist for confirmatory testing and early intervention, which is critical for preventing irreversible damage in conditions like PKU, MSUD, and organic acidemias.
Test Description
Test Code
MOG36
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