Reproductive, Fertility & Pregnancy Labs
Every reproductive, fertility & pregnancy labs calculator on CalcEngines — unit converters, derived indices and interpretive tools, each with its formula, a worked example and the reference intervals it is judged against.
30 calculators in this section
- AMH Age Percentile InterpreterAMH falls throughout reproductive life, so a single reference interval is close to useless — 1.9 ng/mL is low at 25 and unremarkable at 37. This reads a result against a named age-stratified nomogram, and refuses to give a centile when the assay is not the one the nomogram was built on.
- Anti-Müllerian Hormone (AMH) Unit ConverterConvert AMH between ng/mL, µg/L and pmol/L — and read the result for what it is: an estimate of how many follicles are left, measured on an assay that cannot be swapped for another, and a poor predictor of whether you will conceive naturally.
- Calculated Free Testosterone (Vermeulen)Solve the Vermeulen equation for free testosterone from total testosterone, SHBG and albumin — the calculation validated against equilibrium dialysis.
- Estradiol (E2) Unit ConverterConvert oestradiol between pg/mL, pmol/L and ng/L, and see why a single value means nothing without the day of the cycle.
- Estrone (E1) Unit ConverterConvert oestrone between pg/mL, ng/L and pmol/L — and see the point the number exists to make: after the menopause, oestrone made in fat from androstenedione is the dominant oestrogen, which is why a postmenopausal oestradiol can be unmeasurable while the oestrone is substantial.
- Free Androgen Index (FAI) CalculatorCalculate the free androgen index from total testosterone and SHBG, a simple but crude surrogate used mainly in the assessment of women.
- Free Beta-hCG MoM CalculatorWork out a free β-hCG multiple of the median from your result and your laboratory's median for the same gestational age, or enter the reported MoM directly, and see what the direction means. The median belongs to your laboratory — this page does not supply one — and a MoM on its own is not a risk: the combined test needs nuchal translucency, PAPP-A and maternal age as well.
- Free Beta-hCG Unit ConverterConvert the free β subunit of hCG between ng/mL, µg/L and pg/mL. Before anything else: this is not total hCG. Free β-hCG is a different measurand with its own reference figures, and reading a free β result against a total hCG interval — or against the pregnancy-test numbers everyone knows — is the mistake this page exists to stop.
- Fructose Unit ConverterConvert fructose between mg/dL, mmol/L, µmol/L and mg/L. The factor is glucose's, exactly, because fructose is glucose's structural isomer — but the test almost certainly is not: a fructose on a request form is usually seminal fructose, a marker of seminal vesicle function, and its published threshold is not a concentration at all.
- FSH Unit ConvertermIU/mL, IU/L and mU/mL are the same number for FSH — this page confirms that and then does the part that matters, the reference intervals.
- hCG Doubling Time CalculatorCalculate the doubling time from two hCG results and the hours between them, and see how far it can and cannot take an early-pregnancy assessment.
- hCG Unit ConvertermIU/mL, IU/L and mU/mL are the same number for hCG — the useful part of this page is the discriminatory zone, the doubling rule and the hook effect.
- HELLP Syndrome Classification CalculatorTwo published classifications that disagree: Mississippi grades three classes by platelet nadir, Tennessee calls it complete or partial. A laboratory reports against whichever the local unit uses, so this page keeps them separate rather than merging them into a scheme nobody published.
- LH to FSH Ratio CalculatorCalculate the LH to FSH ratio and see why a value above 2 is a classic feature of PCOS but not, on its own, a diagnostic one.
- Luteinizing Hormone (LH) Unit ConverterIU/L, mIU/mL and mU/mL are the same number for LH, so the conversion is the easy part. The hard part is which reference interval applies — and for LH that depends entirely on where in the cycle the sample was taken.
- Modified Ferriman-Gallwey Score CalculatorNine body areas, each 0 to 4, total 0 to 36. The current threshold is 4 to 6, not the 8 that most pages still quote — and this one tables the older figure beside it, with its provenance, so a reader who has been told 8 can see exactly where it came from.
- PAPP-A MoM CalculatorWork out a PAPP-A multiple of the median from your result and your laboratory's median for the same gestational age, or enter the reported MoM directly, and see what a low value means for growth surveillance. The median belongs to your laboratory or screening programme — this page does not supply one, and a MoM on its own is not a Down's syndrome risk.
- PAPP-A Unit ConvertermIU/L and IU/L differ by a thousand, which is the whole hazard on this page. The second hazard is larger: first-trimester screening reports PAPP-A as a multiple of the median for gestation, and the raw concentration on its own means nothing.
- PlGF Unit ConverterConvert placental growth factor between pg/mL, ng/L, ng/mL and µg/L — the first two are the same number. There is deliberately no reference interval on this page, because every published PlGF threshold belongs to a named assay rather than to the measurand, and the thresholds differ between manufacturers by more than any clinical judgement would.
- Pre-Eclampsia Laboratory Criteria InterpreterThe laboratory half of the diagnosis only — platelets, creatinine, transaminases and proteinuria — against ACOG or ISSHP, because the two bodies disagree on three of the four thresholds. Blood pressure belongs to the diagnosis too, and this page does not pretend to make it.
- Progesterone Unit ConverterConvert progesterone between ng/mL, nmol/L and µg/L, with the mid-luteal thresholds for ovulation and why pulsatile release blunts a single value.
- Prolactin Unit ConverterConvert prolactin between µg/L, ng/mL and mIU/L at 21.2 mIU/L per µg/L — then check for macroprolactin and the hook effect, which change what the number means.
- Rotterdam PCOS Criteria CalculatorTwo of three features diagnose polycystic ovary syndrome in an adult — but only after other causes are excluded, and only ever with one of ultrasound or AMH, never both. In an adolescent the third feature does not exist at all, and this page will refuse it.
- Semen Analysis Interpreter (WHO 2021)Classify a semen analysis against the WHO 2021 sixth-edition lower reference limits — and see why those limits are not fertility thresholds.
- sFlt-1 Unit ConverterConvert soluble fms-like tyrosine kinase-1 between pg/mL, ng/L, ng/mL and µg/L — the first two are the same number. As with its partner PlGF, there is no reference interval here on purpose: the thresholds in use belong to named assay platforms, and it is the ratio of the two, not either concentration, that the trials tested.
- sFlt-1/PlGF Ratio CalculatorCalculate the angiogenic ratio used to rule out pre-eclampsia, on the platform your laboratory actually runs — because the same ratio is a rule-out on one assay and intermediate on another.
- SHBG Unit ConverterSex hormone-binding globulin is reported in nmol/L essentially everywhere, and nmol/L is what every free testosterone and free androgen index formula expects — so the ladder here is short on purpose. The µg/dL figure you may have been given is a calibration against an assumed 90 to 95 kDa dimer, not a unit conversion, and this page keeps it off the dropdown and explains why.
- Testosterone Unit ConverterConvert testosterone between ng/dL, ng/mL and nmol/L, with sex-specific ranges and why the time of sampling changes the answer.
- Total Motile Sperm Count (TMSC) CalculatorVolume × concentration × progressive motility ÷ 100 — one number instead of three, and a better predictor of spontaneous pregnancy than the WHO categories. This page also says which published threshold belongs to which question, because the figures in circulation answer three different ones.
- Unconjugated Estriol (uE3) Unit ConverterConvert unconjugated oestriol between ng/mL, µg/L, ng/dL and nmol/L — and then read the sentence that matters more than the arithmetic: without the gestational age and the conversion to a multiple of the median, a raw uE3 concentration means almost nothing.