Best use case

This tool works best for the last 3 natural cycles. Pregnancy, postpartum/breastfeeding, hormonal contraception, HRT, and ovarian stimulation/IVF monitoring can all reduce how well a rhythm-based interpretation applies.

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This standalone page calculates results locally in the browser and auto-saves your draft only on this device. It does not send answers to a server unless you later add your own analytics or form integrations.

Assessment form

Public version: the output shows axis tendencies, confidence, and what to verify next. It does not provide direct herbal prescriptions or a diagnosis.

1) Eligibility & cycle overview

Start here to estimate how interpretable a rhythm-based cycle read is for this month.

Current situation

Age range

Average cycle length (days)

Variation across the last 3 cycles (days)

Use the longest cycle minus the shortest. A spread of 7 days or less is more stable.

Are the last 3 cycles broadly similar?

Premenstrual spotting (days)

Post-menstrual spotting (days)

Sleep pattern

2) Menstrual phase & Blood Sea (Hai Yin / Hai Yang)

Hai Yin reflects the endometrial base and nourishment. Hai Yang reflects transformation, shedding, release, and how smoothly the period moves out.

Bleeding length this cycle (days)

Flow volume

Color and clot pattern

Period pain

History of D&C, repeated uterine procedures, or intrauterine adhesions

Known endometrial or uterine findings

3) Post-menstrual / follicular / ovulatory phase

Focus: Gui Yin, Jing Yin, Shui Yin, Water-in-Fire (FSH), and Yin-in-Yang (LH / ovulatory conversion).

Cycle day the period is fully finished

Across the last 3 cycles, does the 7 / 5 / 3 rhythm broadly fit?

In this framework, both the clean day and the number of stretchy-mucus days are observed against the 7 / 5 / 3 rhythm.

Number of days with clearly stretchy cervical mucus

Cervical mucus / discharge quality

Ovulation evidence

After the period: flushes, heat, or night sweats

Optional lab & ultrasound inputs for this phase

Follicle ultrasound

Endometrial thickness near ovulation (mm)

Ovarian reserve / AMH

Estradiol (E2)

FSH (Water-in-Fire)

LH (Yin-in-Yang)

4) Luteal / premenstrual Yang phase

Focus: Gui Yang, Jing Yang, Qi Yang, Fire Yang, and Earth Yang. The most useful public clues here are BBT, premenstrual warmth/cold, stool, fatigue, swelling, and mood/heat signs.

BBT rise after ovulation

High-temperature phase length (days)

Does the high-temperature phase broadly fit the 2 / 4 / 6 / 8 rhythm?

High-temperature phase pattern

Progesterone / luteal function

After ovulation or premenstrually: coldness, cold lower abdomen, or cold hands/feet

Premenstrual fatigue

Bowel pattern premenstrually or around the period

Premenstrual heat signs: irritability, thirst, dark urine, sleep disturbance

Premenstrual edema / damp heaviness

Repeated vaginal, pelvic, or chronic inflammatory tendency

Biochemical pregnancy / early miscarriage history

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Six Yin · Six Yang Cycle Assessment

Assessment form

TCM Fertility

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