Irregular periods can have many causes, including PCOS, thyroid conditions, weight change, stress, pregnancy, medication and the menopause transition. A diagnosis should not be assumed from one symptom alone.
A private assessment explores cycle pattern, acne or hair changes, weight and metabolic history, fertility plans, medicines and possible pregnancy. Tests and ultrasound are selected to answer specific questions.
Severe pain, heavy bleeding with faintness, pregnancy with pain or bleeding, or rapid deterioration needs urgent care rather than a routine appointment.
Written & reviewed by
Victoria Medical Clinical Team
GMC-registered physicians and specialist consultants
How PCOS is assessed
PCOS is assessed using a combination of features and after considering other causes. The pathway may involve history, examination, selected blood tests and ultrasound where useful; an ultrasound alone does not diagnose every case.
| Assessment area | Why it matters | Possible investigation |
|---|---|---|
| Cycle pattern | Clarifies ovulation and bleeding pattern | History and relevant blood tests |
| Androgen-related symptoms | Acne, hair growth or hair thinning may be relevant | Clinical review and selected tests |
| Metabolic context | Blood pressure, glucose and lipids may matter | Health check or targeted blood tests |
| Pelvic symptoms | May suggest an additional pelvic question | Pelvic ultrasound where appropriate |
Making a practical plan
The plan depends on symptoms, pregnancy plans, endometrial protection, metabolic health and what matters most to you. Treatment and follow-up should be individual rather than a one-size-fits-all protocol.
Related pathways
Irregular cycles may need gynaecology, GP, blood-test or ultrasound input depending on the pattern and clinical context.
What to Expect at Your Appointment
Map your cycles
Discuss timing, symptoms and relevant goals.
Target assessment
Select investigations that answer the clinical question.
Understand findings
Review what results do and do not show.
Plan follow-up
Agree a care plan based on symptoms and priorities.
Frequently Asked Questions
References
- [1]Becker CM et al. ESHRE guideline: endometriosis. Human Reproduction Open. 2022.
- [2]Teede HJ et al. Recommendations from the 2023 International Evidence-based Guideline for the Assessment and Management of Polycystic Ovary Syndrome. Human Reproduction. 2023.
- [3]Munro MG et al. The two FIGO systems for normal and abnormal uterine bleeding symptoms and classification of causes. International Journal of Gynecology & Obstetrics. 2018.
- [4]The North American Menopause Society. The 2022 hormone therapy position statement. Menopause. 2022.
- [5]Zondervan KT, Becker CM, Missmer SA. Endometriosis. New England Journal of Medicine. 2020.
- [6]NICE. Menopause: diagnosis and management (NG23). Updated guidance accessed August 2026.
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