17-OH progesterone nmol/L → ng/mL
Convert 17-oh progesterone from nmol/L to ng/mL
Sources last checked: 2026-11-03
17-OH progesterone nmol/L → ng/mL
Convert 17-oh progesterone from nmol/L to ng/mL
Converts units only; reference ranges depend on the laboratory, the assay and the patient.
What is the 17-OH progesterone nmol/L → ng/mL?
This converter turns 17-hydroxyprogesterone from nmol/L, the SI unit used in UK reports, many European guidelines and several neonatal screening programmes, into ng/mL, the unit on many laboratory reports in Germany, Austria, Turkey and the USA. It divides by 3.026 (equivalent to multiplying by about 0.3305), the factor derived from the molar mass of 17-OHP, 330.5 g/mol.
When to use it
- Reading an SI-reported 17-OHP from a letter, study or guideline in ng/mL
- Comparing an ACTH stimulation test result with a protocol written in ng/mL
- Following a patient with congenital adrenal hyperplasia across laboratories that report in different units
When not to use it
- Dried blood spot screening values, which refer to whole blood and use programme-specific cut-offs
- Salivary 17-OHP, which is reported in much lower concentrations with its own reference ranges
- Interpreting the value: thresholds depend on the assay, sampling time, cycle phase and guideline
How it is calculated
17-OHP (ng/mL) = 17-OHP (nmol/L) ÷ 3.026
Clinical pearls and limitations
- Converts units only; reference ranges depend on the laboratory, the assay and the patient.
- Dividing by 3.026 is the same as multiplying by 0.3305; dividing by 3 gives a quick estimate.
- Values in ng/dL (used in some US sources) are 100 times larger than ng/mL — check the unit before converting.
- In treated congenital adrenal hyperplasia, 17-OHP depends on the timing of the last glucocorticoid dose; compare samples taken at the same point in the dosing cycle.
- LC-MS/MS results are typically lower than immunoassay results, especially in infants; note the method when comparing values.
Frequently asked questions
How do I convert 17-OH progesterone from nmol/L to ng/mL?
Divide by 3.026. For example, 23 nmol/L ÷ 3.026 = 7.6 ng/mL.
How do I convert 17-OHP from nmol/L to ng/dL?
Convert to ng/mL and multiply by 100. For example, 23 nmol/L is 7.6 ng/mL, which is 760 ng/dL.
Why does a newborn screening report give 17-OHP in nmol/L?
Many screening programmes report SI units measured in whole blood from a dried spot. Those numbers and cut-offs are specific to the programme and are not directly interchangeable with serum ng/mL values.
Evidence and guidelines
Have a follow-up question?
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<p><a href="https://medelix.ai/en/calculators/17-oh-progesterone-nmol-l-to-ng-ml">17-OH progesterone nmol/L → ng/mL calculator by Medelix</a></p>For healthcare professionals and medical students. These tools support, and do not replace, clinical judgement. Always check results against the original source and your local protocols.