Method of Collection:
Volume as mentioned on gel vacutainer (Yellow)
Days for reporting:
|SUGGESTED NORMAL RANGES FOR 17 ALPHA - HYDROXY PROGESTERONE
REFERENCE GROUP RANGE UNIT
5 - 30 day
Why is the Test Done?
Screening ? The 17-hydroxyprogesterone (17-OHP) test is ordered as part of newborn screening to detect congenital adrenal hyperplasia (CAH) due to 21-hydroxylase deficiency. CAH is a group of inherited disorders caused by specific gene mutations and associated with cortisol-related enzyme deficiencies. ? The 17-OHP test may be used to screen for CAH in older children or adults before symptoms appear or to confirm a CAH diagnosis in people with symptoms. Diagnosis ? Measurement of 17-OHP in the blood may be used to aid in the diagnosis of CAH in older children and adults who may have a milder, "late-onset" form. Monitoring ? If someone is diagnosed with 21-hydroxylase deficiency, a 17-OHP test may be used periodically to monitor the effectiveness of treatment. Ruling out CAH ? A 17-OHP test may also sometimes be used, along with other hormone tests, to help rule out CAH in women who have symptoms such as excess facial and body hair and irregular periods. This includes women with suspectedpolycystic ovarian syndrome (PCOS) and infertility, and rarely those with suspected adrenal or ovarian cancers. 17-OHP testing may produce false-positive test results. If the level is elevated but not so high that it is diagnostic of CAH, other tests may be performed, such as androstenedione and testosterone. An ACTH stimulation test may be also be ordered as a follow-up test (in CAH, ACTH stimulation will markedly increase 17-OHP levels). Molecular genetic testing may be performed to detect CYP21A2 gene mutations that can cause the condition. A karyotype test may be ordered as a follow-up test to detect chromosome disorders and to help determine a baby's sex. Electrolytes may be ordered to measure the person's sodium and potassium levels. If a newborn or infant has significantly elevated concentrations of 17-OHP, then it is likely that he or she has CAH. If a person has moderately increased levels, then that person may have a less severe case of CAH or may have an 11-beta-hydroxylase deficiency (another enzyme defect that is associated with CAH). Normal 17-OHP results mean that it is likely that the person tested does not have CAH due to a 21-hydroxylase deficiency. Low or decreasing concentrations in a person with CAH indicate a response to treatment. High or increasing levels may indicate that changes in treatment are required. Premature infants often have elevated levels of 17-OHP. The newborn screen may need to be repeated at a later time. Rarely, prenatal 17-OHP testing may be performed on amniotic fluid to detect and treat CAH in the fetus during pregnancy.
How to prepare for the Test:
Your doctor may tell you to stop taking any drugs that may cause fales test results. Such drugs include corticosteroids and birth control pills