Rare Diseases
Rare diseases are a diverse group of conditions affecting different organs and biological pathways. Many rare diseases are genetic, while others may have metabolic, immunological, or other causes.
A rare-disease diagnosis often requires a stepwise and multidisciplinary approach, since no single test can screen for the thousands of individually rare conditions that collectively affect a meaningful portion of the population.
At National Path Lab (NPL), a broad range of specialized laboratory investigations is available to support the stepwise evaluation of suspected rare disease, in coordination with specialist teams.
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About Rare Diseases
Causes & Risk Factors
Rare diseases arise from diverse underlying mechanisms, though genetic causes are common:
• Genetic causes — the majority of recognized rare diseases have an underlying genetic basis, whether inherited or arising spontaneously.
• Metabolic causes — including inherited disorders of metabolism affecting how the body processes specific substances.
• Immunological causes — including certain rare immune dysregulation syndromes.
• Other causes — some rare diseases have causes that remain incompletely understood, requiring ongoing specialist evaluation.
Symptoms & When to Test
Because rare diseases are so diverse, certain general patterns — rather than specific symptoms — often prompt consideration of an underlying rare disease.
• Unexplained or unusual symptoms that do not fit a common diagnosis
• Multiple organ system involvement
• Developmental or congenital abnormalities
• Recurrent unexplained illness
• Unusual laboratory findings
• A strong family history of similar or related unexplained conditions
• Symptoms that remain unexplained despite routine testing
When Should You Consider Testing?
Evaluation for a possible rare disease is generally considered when routine testing has not explained a patient's symptoms, particularly when multiple organ systems are involved, developmental abnormalities are present, or there is a suggestive family history.
Why Tests Are Combined
Because rare diseases span an enormous range of underlying biological mechanisms, evaluation typically starts broad — biochemical, hormonal, and immunological testing — before narrowing toward more specific enzyme, genetic, chromosomal, or molecular testing based on the clinical pattern that emerges.
This stepwise approach reflects both practical and cost considerations, since testing for every possible rare disease simultaneously is neither feasible nor informative — instead, the pattern of findings from initial testing helps guide which specific specialized investigations are most likely to be useful next.
A multidisciplinary approach — often involving specialists across several fields depending on the organ systems involved — is frequently necessary, since rare diseases can affect multiple body systems in ways that require coordinated expertise beyond a single specialty.
Tests Available at NPL
Test Code | Test | Clinical Relevance |
| Biochemical Testing | Initial broad screening relevant to metabolic and other biochemical abnormalities. |
| Hormonal Testing | Considered when an endocrine component is suspected. |
| Immunological Testing | Considered when an immune-related rare disease is suspected. |
| Enzyme Assays | Specific testing for suspected inherited metabolic disorders. |
| Genetic Testing | Considered based on the clinical pattern, ranging from targeted to broader approaches. |
| Chromosomal Testing | Considered when a chromosomal basis is suspected. |
| Molecular Testing | Specific molecular investigations based on the suspected condition. |
Most allergy and immunology blood tests do not require fasting. However, some tests ordered at the same time may have specific preparation requirements. Please follow the instructions provided by your doctor or NPL.
Home Sample Collection
NPL offers convenient home sample collection for Rare Diseases blood tests, so you don't need to visit a lab in person.
→ Book your test online, via the NPL app, or by calling +977 1 5970147 and select a convenient time slot for home sample collection.
→ A certified and experienced NPL phlebotomist visits your home at the scheduled time, following strict hygiene and safety protocols.
→ Your sample is transported under controlled, monitored conditions to NPL's NABL ACCREDITED UNDER ISO15189:2012laboratory for processing.
→ Your digital report is delivered securely to your phone or email, along with access to download and share it as needed.
When to See a Doctor
• Unexplained or unusual symptoms not fitting a common diagnosis
• Multiple organ system involvement
• Developmental or congenital abnormalities
• Recurrent unexplained illness
• Symptoms remaining unexplained despite routine testing — consider specialist or genetic referral
Medical Disclaimer Laboratory tests support the stepwise evaluation of suspected rare disease but must be interpreted by qualified specialists together with the full clinical picture, often requiring a multidisciplinary approach. This content is for general information only and is not a substitute for medical advice, diagnosis, or treatment. |