Before having your blood sample taken, you should fast for 8–12 hours. Alcohol, sugar and coffee may affect some of the results. As smoking may also influence the results, patients are advised not to smoke between waking up and having their blood taken. Only small amounts of water (one or two glasses) are permitted.
Because FSH, LH, progesterone and oestradiol levels vary throughout the menstrual cycle, contact Corilab or your doctor in advance to confirm the appropriate timing for the tests. Depending on the purpose of the assessment, the tests may need to be performed at different stages of the cycle.
Prolactin levels also vary throughout the day, and the blood sample is usually scheduled three to four hours after waking. Stress and physical exercise may affect the result, so follow any specific instructions provided by Corilab.
Diet
In the days leading up to the blood test, continue to follow your usual diet. Excessive food intake or a restrictive diet may affect some laboratory results and their clinical interpretation.
Medication
Tell your doctor or the laboratory about any medication, hormonal treatment, contraceptive, vitamin or supplement you are taking, as these may affect the results. Do not stop, delay or change any prescribed treatment unless specifically instructed by your doctor.