PTH

Alternative names, keywords

Parathyroid hormone, parathormone.

Samples required

● EDTA blood (purple cap/ yellow cap ring, 4 mL tube), and

● clotted blood (gold cap, 5 mL tube) for simultaneous albumin and calcium.

Smaller tubes are available for paediatric samples.

Avoid haemolysis.

Test indications

Investigation of calcium abnormalities. Please only request if hyper or hypocalcaemia (adjusted) has been confirmed, or if there is a specific indication (e.g. ?tertiary hyperparathyroidism).

Test information

Assay measures intact hormone.

Factors affecting test performance/ results

Haemolysed samples are unsuitable.

In rare cases, interference due to extremely high titres of antibodies to analyte-specific antibodies, streptavidin or ruthenium can occur.

Results should always be assessed in conjunction with the patient’s medical history, clinical examination and other findings.

Reference range

1.83 - 7.85 pmol/L
_{Source: Roche Cobas^® PTH kit insert 2025-05, V2.0}

_{Note change to reference range from 7/10/25}

If hypercalcaemic then suppression expected, not normal range result.

Turnaround time

RSCH same day (urgent samples within 2h), PRH one working day (urgent samples within 1h)

Enquiries

Biochemistry (Automation)