Giardiasis (Giardia lamblia) IgG antibodies
Detects IgG antibodies to Giardia lamblia — 'memory antibodies' formed after organism contact with infection, potentially persisting long-term. Determines the fact of early or past infection but does not always indicate current active infection.
Used for: confirming giardia contact; complex parasitosis examination; assessing probable cause of chronic GI symptoms (bloating, pain, diarrhea) and allergic reactions.
Note:
- IgG may be positive after past infection;
- physician evaluates together with complaints and may order stool antigen/PCR for confirmation.
Infection routes:
- dirty hands;
- water/food;
- children's groups.
Recommended for:
- children;
- chronic intestinal complaints;
- allergy + eosinophilia.
Biomaterial: Venous blood
- Draw blood fasting (8-12 hours without food)
- Water is permitted
- Exclude fatty food and alcohol 24 hours before
- No smoking 30 minutes before
Medications: If taking antiparasitic drugs, hormonal drugs, or immunosuppressants — inform physician; dose adjustment is usually not required unless directed by physician
- Prolonged GI symptoms (bloating, pain, diarrhea);
- chronic gastritis/duodenitis of unclear cause;
- allergic manifestations;
- elevated eosinophils;
- children with frequent intestinal disorders.
Note: IgG shows contact but not always activity.
Negative IgG — contact unlikely.
Positive IgG — organism contacted giardia; may be: current or past infection.
At positive result:
- gastroenterologist or infectious disease specialist/parasitologist consultation;
- stool confirmation may be needed.
Result on the day of the request
