Systemic Lupus Erythematosus (SLE)
Systemic lupus erythematosus, commonly known as lupus, is an autoimmune disease that can affect multiple organs, including the skin, joints, kidneys, blood cells, and nervous system. It occurs when the immune system produces autoantibodies that target the body's own tissues, leading to widespread inflammation.
Because lupus can present very differently from one person to another — sometimes with mild joint and skin symptoms, and other times with significant organ involvement — laboratory evaluation generally involves a combination of autoimmune antibody testing and assessment for inflammation or organ involvement.
At National Path Lab (NPL), specialized laboratory investigations support the evaluation and ongoing monitoring of patients with suspected or confirmed SLE.
About Systemic Lupus Erythematosus (SLE)
Causes & Risk Factors
SLE develops through a combination of genetic, hormonal, and environmental factors that disrupt normal immune regulation.
• Sex and hormonal factors — SLE occurs far more frequently in women than men (approximately 9:1), especially during childbearing years, pointing to a strong hormonal component.
• Genetic predisposition — family history of SLE or other autoimmune diseases increases individual risk.
• Age of onset — most commonly diagnosed between ages 15 and 45, though it can occur at any age.
• Ultraviolet (UV) light exposure — sun exposure is a recognized trigger for skin flares and, in some cases, systemic disease activity.
• Certain infections — some viral infections have been associated with triggering lupus-like immune activity in genetically susceptible individuals.
• Certain medications — a small number of drugs can trigger a lupus-like syndrome (drug-induced lupus), which typically resolves after stopping the medication.
Symptoms & When to Test
Lupus symptoms vary widely and can affect nearly any organ system, which is part of what makes diagnosis challenging.
• Joint pain and swelling, often affecting multiple joints
• Characteristic butterfly-shaped facial rash across the cheeks and nose bridge
• Photosensitivity — skin rashes triggered or worsened by sun exposure
• Persistent fatigue
• Unexplained fever
• Mouth or nasal ulcers
• Hair loss
• Chest pain on deep breathing (suggestive of pleuritis or pericarditis)
• Swelling in the legs or around the eyes, or frothy urine (suggestive of kidney involvement)
When Should You Consider Testing?
Testing is generally appropriate when a patient presents with a combination of the symptoms above — particularly joint pain together with skin rash, photosensitivity, or unexplained multi-organ symptoms — rather than any single symptom in isolation.
Why Tests Are Combined
ANA is typically the first screening test when systemic autoimmune disease is suspected, but it is not specific to lupus and can be positive in other conditions or even in some healthy individuals.
When ANA is positive and lupus remains clinically suspected, Anti-dsDNA (strongly associated with SLE) and the ENA profile (which characterizes specific nuclear antigen antibodies) help refine the diagnosis.
Complement levels (C3 and C4) are often added because they can be reduced during periods of active lupus, particularly with kidney or immune-complex involvement — helping distinguish active disease from stable, quiescent lupus.
Tests Available at NPL
Test Code | Test | Clinical Relevance |
I0025 | ANTI NUCLEAR ANTIBODY; ANA; IFA HEP-2 END POINT TITRE | An important initial investigation when a systemic autoimmune connective-tissue disease is suspected. |
I0108 | ANTI DS DNA; EIA | An antibody strongly associated with SLE and particularly useful when lupus is suspected; levels may also correlate with disease activity. |
I0036 | EXTRACTABLE NUCLEAR ANTIGENS (ENA), SCREEN PROFILE 2, 18 ANTIGENS | Provides information about antibodies against specific nuclear antigens and may help further characterize connective-tissue autoimmune disease. |
B0039 | C3 COMPLEMENT | Complement levels can provide useful information in selected patients, particularly when immune-complex disease or lupus activity is being assessed. |
B0040 | C4 COMPLEMENT | Complement levels can provide useful information in selected patients, particularly when immune-complex disease or lupus activity is being assessed. |
Most autoimmune antibody tests and inflammatory markers do not require fasting. However, if your doctor has ordered other tests at the same time — such as glucose or lipid testing — fasting may be required for those investigations. Please follow the preparation instructions provided by your doctor or NPL.
Home Sample Collection
NPL offers convenient home sample collection for all Systemic Lupus Erythematosus (SLE) 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 ISO 15189:2022 laboratory 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
• Butterfly-shaped facial rash, especially with joint pain or fatigue
• Joint pain or swelling accompanied by unexplained fever
• Chest pain that worsens with deep breathing
• Swelling in the legs or around the eyes, or noticeably frothy urine
• New neurological symptoms such as confusion, seizures, or severe headache
• Known SLE with new or worsening symptoms
• Recurrent mouth ulcers combined with other systemic symptoms
Medical Disclaimer Laboratory tests are supportive tools and should not be used alone to diagnose or exclude systemic lupus erythematosus. Results should be interpreted by a qualified healthcare professional together with the patient's clinical history, examination, and other relevant investigations. |