The laboratory testing done for absence of period (termed as secondary amenorrhea) should include measurements of serum prolactin, thyrotropin, and FSH to test for hyperprolactinemia, thyroid disease, and ovarian failure. Apart from pregnancy other causes of missed or delayed periods are;
1) Ovarian hormone dysfunctions
2) Thyroid hormone abnormalities
3) Stress, anxiety, emotional disorders
4) Sudden weight loss or gain
5) Excessive physical activity
Read the resource under the heading secondary amenorrhea (delayed or missed periods);
The screening tests for the patient with amenorrhea include urinary HCG, complete blood count, sedimentation rate, thyroid function, prolactin, FSH and LH, and assessment of estrogen status.
Causes of amenorrhea/delayed period are pregnancy, drugs, and systemic diseases, hypothalamic and pituitary amenorrhea, "postpill" amenorrhea; hyperprolactinemia, androgen resistance, etc.
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