Perimenopause: The patient's age, elevated FSH (36.0 IU/L), and relatively low estradiol (99 pmol/L) levels are consistent with perimenopause, a transitional phase leading to menopause. The slightly elevated LH (15.7 IU/L) and low progesterone (1.3 nmol/L) also support this diagnosis, as they can indicate decreased ovarian function and disrupted menstrual cycles.

Premature Ovarian Failure (POF): Although less common, the patient's elevated FSH and low estradiol levels could also suggest premature ovarian failure, especially if she is experiencing amenorrhea or irregular menstrual cycles.
Polycystic Ovary Syndrome (PCOS): While the patient's LH level is slightly elevated, which can be seen in PCOS, the low progesterone and estradiol levels are not typical for this condition. However, PCOS can present with a wide range of hormonal imbalances, making it a possible, though less likely, diagnosis.

Pituitary Tumor: Although rare, a pituitary tumor could cause an elevation in FSH and LH levels. It is crucial to rule out this possibility due to the potential for serious complications, including visual field defects and hormonal imbalances.
Thyroid Dysfunction: Hypothyroidism, in particular, can cause elevated FSH and LH levels. It is essential to check thyroid function tests to rule out this condition, as untreated thyroid dysfunction can have significant health implications.

Resistant Ovary Syndrome: A rare condition characterized by elevated gonadotropin levels (FSH and LH) with normal or low estradiol levels, which could be considered in this patient.
Gonadal Dysgenesis: A rare condition where the ovaries do not develop properly, leading to hormonal imbalances. This diagnosis would be more likely in a younger patient but should be considered if other diagnoses are ruled out.