Vitamin D test for women — the marker most missed in 'normal' bloods.
Vitamin D acts more like a hormone than a vitamin — it talks to your sex hormones, thyroid, mood and immune system. Most women in Bali, AU and NZ run lower than they think.
Her Form measures 25-hydroxy vitamin D (the storage form) on every panel and as a stand-alone draw. Nurse home draw, accredited lab, written specialist read.
Why vitamin D matters for women
Low vitamin D is linked to lower progesterone, irregular cycles and reduced fertility outcomes.
It's central to thyroid antibody regulation — most TPO-positive women run vitamin-D-deficient.
Bone density loss accelerates through perimenopause; vitamin D + protein + load is the prevention triangle.
Optimal range for women (per Endocrine Society work) is 75–125 nmol/L; the lab usually only flags <50 nmol/L.
When to test vitamin D
Any day, any cycle phase, fasting not required.
Best read at the end of dry season and end of wet season to see your natural variation — many Bali expats are surprised at how seasonal it is.
Re-test 12 weeks after starting supplementation to confirm dose is right.
The markers that clarify the picture
Essential Hormone Panel
Not feeling like yourself? This is where to start.
- · Thyroid, sex hormones, iron
- · Written specialist review
- · Personalised protocol
What is the optimal vitamin D level for women?+
Most labs flag deficiency only below 50 nmol/L. For mood, fertility, thyroid antibodies and bone density, we target 75–125 nmol/L. Above 250 is worth lowering dose.
Can I get enough vitamin D from sunshine in Bali?+
Surprisingly often, no — sunscreen, indoor work, and the fact that most absorption happens midday with skin exposed mean even tropical-living women can run low. Testing is the only way to know.
How does vitamin D affect my cycle?+
Low vitamin D is associated with lower progesterone, longer follicular phases and a higher chance of irregular ovulation. Correcting it doesn't fix everything, but it removes a common confounder.
Should I retest after supplementing?+
Yes — 12 weeks after starting a defined dose. Vitamin D dosing is individual; some women need 1,000 IU, others 4,000 IU, to reach optimal.
Is a GP referral needed?+
No — Her Form is direct-to-consumer. We send a certified nurse to your home, ship samples to our accredited partner lab, and return results with a written review by our health specialists. Robyn is available for an optional 1:1 consult.
How long until I have my results?+
7–14 working days from draw, including written specialist review. Anything urgent is flagged the same day it lands.
References
- Endocrine Society — Female hormone health — Sex hormone assessment and interpretation in women
- Jean Hailes for Women's Health — Comprehensive women's hormone health guidance
- RANZCOG — Women's health guidelines — ANZ clinical standards for reproductive-age women
- NICE — Women's health guidelines — Evidence-based hormone and reproductive health guidance
The references above are provided for educational purposes only. Her Form does not endorse any specific organisation, treatment, or guideline. Information on this page does not constitute medical advice and is not a substitute for consultation with a qualified healthcare professional.