Acute Intermittent Porphyria (HMBS) - Gene Analysis

This analysis detects mutations in the HMBS gene associated with Acute Intermittent Porphyria. Understanding these genetic changes helps diagnose this rare disorder, allowing early intervention to manage symptoms and prevent severe complications.

This test is done:

• To confirm a suspected diagnosis of Acute Intermittent Porphyria
• To guide treatment decisions and disease management
• To assess the risk of passing the genetic mutation to offspring

This test is recommended for:

• History or symptoms of unexplained abdominal pain
• Family history of porphyrias
• Suspected cases of unexplained neurological or psychiatric symptoms
• Preconception or prenatal testing for at-risk individuals

• Abnormal results could indicate the presence of mutations linked to Acute Intermittent Porphyria.
• Further genetic counselling may be suggested for affected individuals.

During the test:

• Collection of 3 ml EDTA whole blood sample
• The sample that will be sent for DNA sequencing.

Before the test:

• No special dietary restrictions needed
• Follow specific blood sample collection guidelines as advised by your healthcare provider

Consult your healthcare provider for specific requirements.

Tests often ordered alongside Acute Intermittent Porphyria Gene Analysis include:

• Porphyrin Testing: Measures levels in blood, stool, or urine to assess heme production
• Liver Function Tests: Evaluate liver health, crucial for heme synthesis in the body
• Symptom-Specific Assessments: Neurological exams, imaging studies, or skin biopsies may be conducted based on clinical signs.

HMBS Gene Analysis or Genetic Testing for Acute Porphyria

Acute Intermittent Porphyria is a rare inherited disorder affecting haem synthesis, leading to porphyrin accumulation in the body. Symptoms include abdominal pain, neuropathy, and psychiatric disturbances. Timely diagnosis through gene analysis can help manage symptoms and prevent complications.

Acute intermittent porphyria HMBS gene analysis is a genetic test that examines the hydroxymethylbilane synthase (HMBS) gene to identify mutations causing AIP, an autosomal dominant disorder affecting heme biosynthesis. This test helps diagnose AIP and identify carriers within families.

Yes, many labs like Metropolis offer home sample collection services for genetic testing, including the acute intermittent porphyria HMBS gene analysis. This involves sending a phlebotomist to collect the blood sample at your home, providing convenience and comfort during the testing process.

Normal levels in the acute intermittent porphyria HMBS gene analysis are typically defined by the absence of pathogenic mutations in the HMBS gene. The presence of any mutation associated with AIP is considered abnormal and indicative of the disorder.

The HMBS gene test is used to diagnose acute intermittent porphyria (AIP), identify carriers within families, and guide genetic counselling and management strategies. It helps differentiate AIP from other acute hepatic porphyrias with similar symptoms and biochemical findings.

Testing is usually required once to confirm the diagnosis or carrier status. However, family members of an affected individual may need to undergo the acute intermittent porphyria HMBS gene analysis to determine their carrier status and assess the risk of passing the mutation to their offspring.

There is no specific time requirement for the acute intermittent porphyria HMBS gene analysis; it can be done at any time as it involves a blood sample. The test is performed when there is a suspicion of AIP based on clinical symptoms or family history.

No, fasting is not required for the HMBS gene test as it involves DNA sequencing from a blood sample. The test can be performed at any time, regardless of your meal schedule, as it does not affect the results.

Before undergoing the acute intermittent porphyria HMBS gene analysis, it is recommended to consult with a genetic counsellor and provide detailed clinical and family history to aid in the interpretation of the test results. This helps ensure accurate diagnosis and appropriate management.

The primary parameter in the acute intermittent porphyria HMBS gene analysis is the sequencing of the HMBS gene to identify any mutations. Additional parameters may include biochemical tests, such as urinary δ-ALA and PBG levels, for supporting evidence of the disorder.

The acute intermittent porphyria HMBS gene analysis should be done when there is a suspicion of AIP based on clinical symptoms or family history, or for genetic screening of family members to determine their carrier status and assess the risk of passing the mutation.

The time required for the HMBS gene test itself is minimal, as it only involves a blood draw. However, the processing and analysis of the sample can take several weeks, typically ranging from 2 to 6 weeks, depending on the laboratory.

Reports for the acute intermittent porphyria HMBS gene analysis are usually available within 24 hours after the blood sample is collected and sent to the lab for processing and analysis. The exact turnaround time may vary depending on the lab.