The Cryptococcal antigen (CrAg) looks at a fungal antigen in blood or spinal fluid. It is done for: people with advanced HIV and headache.
General health information, not a diagnosis. In an emergency, call 102. Always consult a qualified health professional.
People with advanced HIV and headache.
No fasting needed. Laboratory-specific; see the reference range on your report. High or positive may mean: Cryptococcal infection. Low or negative may mean: Not detected. General information, not a diagnosis. Results must be interpreted by a qualified health worker.
A fungal antigen in blood or spinal fluid.
Blood or spinal fluid
Cryptococcal infection.
Not detected.
Reference ranges vary by lab, age and sex — always use the range printed on your own report.
Consult a doctor to interpret results — a single test does not make a diagnosis.
Uses your location once to list the nearest facilities. Nothing is stored.
What does the Cryptococcal antigen (CrAg) measure?
A fungal antigen in blood or spinal fluid.
Why is the Cryptococcal antigen (CrAg) done?
People with advanced HIV and headache.
Do I need to fast for the Cryptococcal antigen (CrAg)?
No fasting needed.
What does a high or positive Cryptococcal antigen (CrAg) mean?
Cryptococcal infection.
What does a low or negative Cryptococcal antigen (CrAg) mean?
Not detected.
What is the normal range for the Cryptococcal antigen (CrAg)?
Laboratory-specific; see the reference range on your report.
Why is Cryptococcal antigen (CrAg) done?
People with advanced HIV and headache.
Do I need to prepare or fast for Cryptococcal antigen (CrAg)?
No fasting needed. Laboratory-specific; see the reference range on your report. High or positive may mean: Cryptococcal infection. Low or negative may mean: Not detected. General information, not a diagnosis. Results must be interpreted by a qualified health worker.
SI text CC BY 4.0; decoder reference data (cited per range); LOINC codes free with attribution (notice included).
Sources: SI health summary (own words); MedlinePlus Lab Tests and CDC as references