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[Crozet protocol: does a lipid-rich meal interfere with cryoglobulinemia assay?]
B Evrard1, C Martin, P Jouanel
1CHU Clermont-Ferrand, Laboratoire d'immunologie, Hôtel-Dieu, 63058 Clermont-Ferrand ; Faculté de Médecine-Pharmacie, 63001 Clermont-Ferrand. bevrard@chu-clermontferrand.fr
Insights
Fasting is not required for cryoglobulin testing. A study found that a lipid-rich meal did not significantly affect cryoglobulin levels, simplifying blood sample collection for patients.
Area of Science:
- Clinical Chemistry
- Immunology
- Laboratory Medicine
Context:
- Cryoglobulins are immunoglobulins precipitating at low temperatures.
- Their detection is crucial for identifying potential complications and underlying diseases like hepatitis C and hematological disorders.
- Accurate cryoglobulin testing requires strict preanalytical conditions, including fasting, which is challenging in large patient populations.
Purpose:
- To evaluate the necessity of a fasting state for blood sampling in cryoglobulin testing.
- To assess the impact of a lipid-rich meal on cryoglobulin levels.
- To potentially simplify the preanalytical requirements for cryoglobulin assays.
Summary:
- A study involving healthy volunteers (n=10) assessed cryoglobulin levels before and after a lipid-rich meal.
- Cryoglobulin assays were performed using the Hartree technique, with lipid profiles measured concurrently.
- Results indicated that a lipid-rich meal, particularly in triglycerides, did not significantly affect cryoglobulin levels.
Impact:
- The findings suggest that patients do not necessarily need to fast before blood sampling for cryoglobulin testing.
- This research supports modifying the significance threshold for cryoglobulin levels, potentially recognizing low levels as physiological.
- Further studies with larger cohorts are recommended to establish a new threshold and validate these findings.
Abstract:
Cryoglobulins are serum immunoglobulins that precipitate reversibly at low temperature. It is important to determine their presence, because they can be responsible for severe complications. They can also reveal underlying conditions, in particular hepatitis C and haematological diseases. Laboratory investigations of cryoglobulins are problematic and require adherence to strict preanalytical conditions. We decided to determine wether a patient really needs to be in a fasting state when a blood sample is taken. In practice, this requirement is difficult for us to meet, because of our large patient population (consultations in a teaching Hospital). We therefore devised a protocol, called the Crozet protocol based on the assay of cryoglobulinemia in healthy volunteers, before and after a meal rich in lipids. Ten patients were tested. Cryoglobulinemia assays were performed according to the technique of Hartree. Lipid profiles were measured on Modular P (Roche Diagnostics). Cryoglobulinemia assay does not seem to be unduly affected by a meal rich in lipids, in particular in triglycerides. Hence the patient does not necessarily have to be on an empty stomach at blood sampling. This study allowed us to modify our threshold of significance (from 15 to 30 microg/mL), which confirmed our view of the physiological character of a low cryoglobulinemia level. Studies involving a greater number of healthy subjects are needed to accurately establish a new threshold and to confirm our findings.
