How is Antiphospholipid / Hughes Syndrome diagnosed?

Antiphospholipid syndrome (APS), or Hughes syndrome, is diagnosed through a combination of clinical criteria—such as a history of blood clots or pregnancy complications—and persistent laboratory evidence of antiphospholipid antibodies found in the blood. Because symptoms can mimic other conditions, diagnosis requires a specialized clinical evaluation, often involving a rheumatologist or hematologist, to confirm that these antibodies are present on two separate occasions at least 12 weeks apart.

How is Antiphospholipid / Hughes Syndrome diagnosed?

The diagnostic process for Antiphospholipid / Hughes syndrome is a rigorous clinical exercise governed by the Revised Sapporo criteria. A physician must identify at least one clinical event (thrombosis or pregnancy morbidity) and at least one laboratory abnormality. Because the antibodies can appear temporarily during infections, the diagnostic protocol mandates that blood tests be repeated after 12 weeks to confirm the condition is chronic rather than transient. The "diagnostic odyssey" for patients with Hughes syndrome is often long and frustrating, as symptoms like unexplained fatigue, migraines, or minor clotting events are frequently dismissed or misdiagnosed as other autoimmune or vascular disorders.

What tests and examinations are used for Hughes syndrome?

There is no single "gold standard" test; rather, clinicians use a panel of specific blood markers. Laboratory testing for Antiphospholipid / Hughes syndrome typically includes:

• Lupus Anticoagulant (LA) test: A functional coagulation assay.


• Anti-cardiolipin antibodies (aCL): Measured via ELISA (IgG and IgM).


• Anti-beta-2 glycoprotein I antibodies: A highly specific marker for the syndrome.


• Imaging: Ultrasound, CT, or MRI scans are used to confirm the presence and location of blood clots (thrombosis).

Which specialists should lead the diagnostic process?

Given the complexity of Antiphospholipid syndrome, it is rarely diagnosed by a primary care physician alone. A rheumatologist or a hematologist is typically required to synthesize the clinical history with laboratory results. Because the disease affects multiple organ systems, a multidisciplinary approach involving cardiologists, neurologists, or obstetricians (for those with pregnancy complications) is often necessary. If you feel your current medical team is unfamiliar with Hughes syndrome, seeking a second opinion from a center of excellence or a university-affiliated autoimmune clinic is a critical step in ending the diagnostic delay.

What conditions can be confused with Antiphospholipid syndrome?

The clinical presentation of Antiphospholipid syndrome often overlaps with other autoimmune or clotting conditions, leading to frequent misdiagnosis. Differential diagnoses often considered include Systemic Lupus Erythematosus (SLE), inherited thrombophilias (such as Factor V Leiden), vasculitis, or even migraines and multiple sclerosis when neurological symptoms are present. Distinguishing Antiphospholipid syndrome from these conditions is essential, as the treatment—typically long-term anticoagulation—differs significantly from the immunosuppressive therapies used for other autoimmune diseases.

Next steps

• Consult with a board-certified rheumatologist or hematologist who has specific clinical experience with APS.


• Keep a detailed medical journal documenting all clotting events, miscarriages, or unexplained neurological symptoms.


• Join the DiseaseMaps.org community, where 451 people with Antiphospholipid / Hughes syndrome share their experiences and advice on navigating the diagnostic journey.


• Request copies of all your lab reports to ensure your antibody titers are tracked over time.

Medical disclaimer: This information is for educational purposes only and does not constitute medical advice, diagnosis, or treatment; always seek the advice of your physician or other qualified health provider with any questions regarding a medical condition.

References

• NIH Genetic and Rare Diseases Information Center (GARD): Antiphospholipid Syndrome


• Orphanet: Antiphospholipid Syndrome (ORPHA:93922)


• The Hughes Syndrome Foundation: Clinical Guidelines and Patient Resources


• OMIM (Online Mendelian Inheritance in Man): Antiphospholipid Syndrome