Hexagonal Phase Confirm

Quest Diagnostics

By Healthmatters Editorial Team

Peer-reviewed sources

Negative

If the Hexagonal Phase Confirm test is negative, it suggests that lupus anticoagulant (LA) is not present in the patient's plasma. This result would indicate that the prolonged clotting time observed in the initial screening test (such as the activated partial thromboplastin time, APTT) is likely not due to lupus anticoagulant. There could be other reasons for a prolonged APTT, such as the presence of other anticoagulants, factor deficiencies, or an inhibitor other than LA. In the context of diagnosing conditions associated with lupus anticoagulant, such as antiphospholipid syndrome, a negative Hexagonal Phase Confirm test would typically lead a clinician to consider other potential causes for the patient's symptoms or laboratory findings. It is important to note that the diagnosis of conditions like antiphospholipid syndrome is based on a combination of clinical criteria and laboratory results, so a negative test for LA does not necessarily rule out the syndrome or other related conditions. If clinical suspicion remains high despite a negative Hexagonal Phase Confirm test, further testing or alternative methods may be employed to investigate the presence of antiphospholipid antibodies or other possible causes of the patient's clinical presentation.

Positive

If the Hexagonal Phase Confirm test is positive, it indicates the presence of lupus anticoagulant (LA) in the patient's blood. A positive result supports the diagnosis of antiphospholipid syndrome (APS) if the patient has clinical features consistent with this condition, which may include a history of thrombosis or pregnancy morbidity. A positive Hexagonal Phase Confirm test is significant because lupus anticoagulant is one of the primary laboratory criteria for the diagnosis of APS. Patients with APS are at an increased risk of blood clot formation (thrombosis), which can lead to complications such as deep vein thrombosis, pulmonary embolism, strokes, and in pregnant women, an increased risk of miscarriage and other pregnancy-related complications. Following a positive result, healthcare providers will consider this finding in the context of the patient's clinical history, signs, and symptoms, and may undertake further testing to confirm the diagnosis and to rule out other potential causes for the patient's condition. Once a diagnosis is established, appropriate treatment and management strategies can be implemented to reduce the risk of thrombosis and other complications associated with APS. This might include anticoagulation therapy and regular monitoring, among other interventions.

The Hexagonal Phase Confirm test is a specific laboratory test used to detect lupus anticoagulant (LA), which is a type of antibody associated with antiphospholipid syndrome and other autoimmune disorders. The term "Hexagonal Phase" refers to a particular method of confirming the presence of LA.

This test is part of a broader Lupus Anticoagulant Evaluation which may include various other tests to assess for the presence of these antibodies because they show a great deal of heterogeneity (=diversity).

When a patient's plasma is tested for lupus anticoagulant, the initial screening may involve an assay called the activated partial thromboplastin time (APTT). If the APTT result is prolonged, meaning it takes longer than normal for blood to clot, the Hexagonal Phase Confirmation may be performed as an additional step to confirm the presence of LA. This confirmatory test uses a hexagonal phase phospholipid, derived from a soybean extract, that retains its hexagonal structure and can avidly bind LA. This helps in differentiating lupus anticoagulant from other factors that might prolong the APTT, such as heparin therapy, thus providing a more specific indication of the presence of these antibodies.

Furthermore, understanding the outcome of the Hexagonal Phase Confirm test is important for the diagnosis and management of conditions associated with LA, such as an increased risk of thrombosis. A weakly positive result may have different implications and can be significant in the context of a patient's clinical picture, especially if they are on anticoagulation therapy with medications like heparin or warfarin.

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Written by Healthmatters Editorial Team

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