My cycles are quite long (consistently 37+ days) & irregular. We are trying to get pregnant. What tests should doctor do for long cycles? When?

2. These tests include: 1) ovarian reserve testing (fsh, lh, Estradiol and amh-anti mullerian hormone), 2) androgens (testosterone, dheas, 17-hydroxyprogesterone), thyroid hormone tests (tsh, t4) and prolactin. Any anormality of these hormones may lead to anovulation, disorder in which a woman is not releasing an egg every month. Anovulation is the main reason for irregular menstrual cycles.
TSH, prolactin. In cycles >32 days, the problem can be slow follicular growth (inadequate FSH stimulation) or suboptimal ovulation (delayed LH release). Tsh, prolactin, and androgens can be sent. However, treatment usually entails taking ovulation inducing medications such as clomiphene, femara, (letrozole) or injectables (fsh or hmg). Problems with ovulation are usually easy to treat. Please consult your physician.
Hormone Pannel. One key to sucessful pregnancy is determining if and when someone is ovulating. This usuay occurs on days 10 through 20 of a regular 28 day cycle, day one being the first day of ones period. If the cycle is irregular then lh:fsh levels should be checked to start with including tsh, estrogen and prolactin levels. A book entitled "the fertility diet" by jorge chavarro et al. May prove helpful.