Methylmalonic Acid - Plasma
Use
The Methylmalonic Acid - Plasma test provides a quantitative assessment of methylmalonic acid levels, which are crucial for diagnosing methylmalonic acidemia, a rare inherited metabolic disorder characterized by high methylmalonic acid concentrations in plasma. Symptoms may include vomiting, lethargy, and severe ketoacidosis. Individuals with this condition are at risk of intellectual disability and other severe health issues. Importantly, mild elevations in this acid may also suggest vitamin B12 deficiency. Therefore, results must be interpreted with careful consideration of clinical context and patient history. The test is intended for symptomatic individuals rather than for carrier screening purposes, ensuring that diagnostic evaluations are accurate and relevant to the patient's condition.
Special Instructions
Indications for testing include clinical or suspected methylmalonic acidemia and positive newborn screenings. This test cannot be used for carrier screening. It is crucial to consult with a healthcare provider for appropriate interpretation of results.
Limitations
The Methylmalonic Acid test has limitations when interpreting levels, particularly because elevated values can arise from both methylmalonic acidemia and vitamin B12 deficiency. Due to the overlap in presentations, proper clinical correlation and review of patient history are necessary. Additionally, this test is not suitable for screening carrier individuals as it may lead to misinterpretation when used out of context. Variability in the assay and the influence of medications or changes in diet may also affect results. Moreover, the test is sensitive to collection and handling; improper collection or delayed processing could result in compromised specimen integrity and inaccurate measurements.
Methodology
Mass Spectrometry
Biomarkers
Result Turnaround Time
8 days
Related Documents
For more information, please review the documents below
Specimen
Plasma (Frozen)
Volume
1-2 cc
Minimum Volume
1 cc
Container
Sodium Heparin (green-top) tube
Collection Instructions
Draw blood in a Sodium Heparin (green-top) tube(s) and separate as soon as possible.
Storage Instructions
Store the specimen frozen at -20C.
Causes for Rejection
Improper collection or delayed processing.
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | Not stable |
| Refrigerated | Not stable |
| Frozen | Up to 7 days |