Pituitary, Gut & Metabolic Hormones
Every pituitary, gut & metabolic hormones 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.
22 calculators in this section
- ACTH Unit ConverterConvert ACTH between pg/mL, ng/L and pmol/L. pg/mL and ng/L are the same number — the harder problem is that ACTH decays in a warm tube, so a low result may be the specimen rather than the patient.
- Adiponectin Unit ConverterConvert adiponectin between µg/mL, mg/L, µg/L and ng/mL. The arithmetic is exact; the interpretation is not, because there is no agreed clinical decision threshold, no reference method between manufacturers, and the relationship with obesity runs the opposite way to most readers' intuition — adiponectin falls as adiposity and insulin resistance rise.
- Chromogranin A Unit ConverterConvert chromogranin A between ng/mL, µg/L and ng/L — and read the interference that dominates the test: proton pump inhibitors raise chromogranin A into the range seen with tumour, and must be stopped before the sample is taken.
- Copeptin InterpreterCopeptin is reported in one unit, so there is nothing to convert. The mistake worth guarding against is reading a baseline value against a stimulated cut-off — the two differ by a factor of seven, and 3 pmol/L means nothing at rest and diagnoses AVP deficiency after hypertonic saline. This page asks which test the sample came from before it applies a threshold to it.
- Gastrin Unit ConverterConvert fasting gastrin between pg/mL, ng/L and pmol/L. Before reading a raised result: proton pump inhibitors raise gastrin substantially, so a high value in someone taking one is expected rather than diagnostic.
- Glucagon Unit ConverterConvert plasma glucagon between pg/mL, ng/L and pmol/L. A rarely measured hormone with essentially one indication — suspected glucagonoma — and a mild elevation that is usually something else entirely.
- Growth Hormone Stimulation Test Interpreter (GH Deficiency)Read a peak growth hormone from a glucagon, macimorelin, insulin tolerance, arginine or GHRH-plus-arginine test against the cut-off that belongs to that test, that body weight and that age group. Adult cut-offs follow the 2019 AACE guideline; children are read against both paediatric cut-offs in use, because the Pediatric Endocrine Society declines to choose one.
- Growth Hormone Unit ConverterConvert growth hormone between ng/mL, µg/L, mIU/L and µIU/mL using the WHO standard of 3.0 IU per mg — and see why that factor was different before 2001, and why a single random GH answers almost nothing.
- Hyperprolactinaemia Interpreter (High Prolactin)Enter a prolactin in mIU/L or µg/L with your laboratory's upper limit, and what is known — macroprolactin screening, pregnancy, drugs, hypothyroidism, renal failure, pituitary imaging. It reads the level against the thresholds the Endocrine Society and Pituitary Society use, and flags the two traps that change management: macroprolactin, and a large tumour with a modest prolactin that may be a stalk effect or a hook effect.
- IGF-1 Interpreter (× ULN) — Acromegaly Screening and ControlEnter an IGF-1 and your laboratory's upper limit for the patient's age and sex, and say whether this is a screening test or a patient on treatment. It gives the result as a multiple of the upper limit — the form the acromegaly guidelines use — reads it against the 1.3 × ULN diagnostic line and the treatment target, and flags the conditions that raise or lower IGF-1 without any change in growth hormone.
- IGF-1 Unit ConverterConvert IGF-1 (somatomedin C) between ng/mL, µg/L and nmol/L, and read it against an age- and sex-matched adult interval — because an IGF-1 without an age to compare it with is not a result at all.
- IGFBP-3 Unit ConverterConvert IGFBP-3 between mg/L, µg/mL, ng/mL and nmol/L, against age-matched adult intervals — and note that the molar figure is an approximation, because the circulating protein is glycosylated and its mass is not fixed.
- Insulin Tolerance Test InterpreterNothing in an insulin tolerance test means anything until the glucose has actually fallen below 2.2 mmol/L with symptoms. After that, the cortisol peak is read against a threshold that depends on which assay measured it — modern specific assays read several hundred nanomoles lower than the historical 500 to 550 — and the growth hormone peak against two competing guideline figures.
- Leptin Unit ConverterConvert leptin between ng/mL, µg/L, pmol/L and nmol/L — and read why a leptin without a body mass index beside it has no reference interval, and why high leptin in obesity means resistance rather than excess.
- Macroprolactin PEG Recovery CalculatorWork out the post-PEG prolactin recovery and read it against the < 40% / 40–60% / > 60% scheme — then read the part underneath, because the laboratories that established that scheme have since argued for reporting the post-PEG prolactin against its own interval instead.
- OGTT Growth Hormone Suppression InterpreterThe growth hormone nadir after 75 g of glucose is read against a cut-off that has moved twice and depends on the assay and on the patient's body mass index. This page puts the current consensus thresholds and the historical one side by side, reads them alongside the IGF-I, and treats a raised IGF-I with a suppressed nadir as a named result rather than a contradiction.
- Pancreatic Polypeptide Unit ConverterConvert pancreatic polypeptide between pg/mL, ng/L and pmol/L, with the molar factor derived from the peptide's own sequence — and read why the reference limit rises 20 pg/mL every decade, and why a raised PP is far more often renal impairment or a non-fasting sample than a tumour.
- Serotonin Unit ConverterConvert blood serotonin between ng/mL, µg/L and nmol/L — and note first that whole-blood serotonin is almost entirely platelet-bound, so a thrombocytosis raises it with no carcinoid in sight.
- Urinary 5-HIAA Unit ConverterConvert urinary 5-HIAA between mg/L, mg/dL, µmol/L and mmol/L — then turn the concentration into the 24-hour excretion your laboratory actually reports, using the collection volume.
- Vasopressin (ADH) Unit ConverterConvert arginine vasopressin between pg/mL, ng/L and pmol/L — and read why AVP is so unstable ex vivo that copeptin, its equimolar precursor fragment, has largely replaced it.
- VIP Unit ConverterConvert vasoactive intestinal peptide between pg/mL, ng/L and pmol/L, with the fasting reference interval — and the two things that decide whether the result is worth anything: when the sample was taken and how fast it was frozen.
- Water Deprivation Test InterpreterThe indirect water deprivation test measures the kidney's concentrating ability and infers the hormone from it. It is right about 70 to 77% of the time, and it is at its worst on exactly the question it is usually asked — partial AVP deficiency against primary polydipsia. This page reads the osmolalities honestly, including when they cannot be read at all.