Lab Tests Beginning With P

14 tests in the Lab Values reference begin with the letter P. Every name links to a page with its typical adult range in both unit systems, plain-language notes on high and low results, and preparation notes where they apply.

A B C D E F G H I L M N NUMBERS O P R S T U V W Z

Test	Abbr.	Typical range (conventional)	Typical range (SI)
Parathyroid Hormone	PTH	15–65 pg/mL	1.6–6.9 pmol/L
Partial Pressure of Carbon Dioxide, Arterial	PaCO2	35–45 mmHg	4.7–6.0 kPa
Partial Pressure of Oxygen, Arterial	PaO2	80–100 mmHg	10.7–13.3 kPa
Phosphate	PO4	2.5–4.5 mg/dL	0.81–1.45 mmol/L
Plasma Free Metanephrines	—	Metanephrine <57; Normetanephrine <148 pg/mL	Metanephrine <0.31; Normetanephrine <0.90 nmol/L
Platelet Count	PLT	150–400 ×10³/µL	150–400 ×10⁹/L
Potassium	K	3.5–5.0 mEq/L	3.5–5.0 mmol/L
Prealbumin	—	20–40 mg/dL	200–400 mg/L
Procalcitonin	PCT	<0.1 ng/mL	<0.1 ng/mL
Progesterone	—	Male <1.0; Female 5–20 (luteal) ng/mL	Male <3.2; Female 15.9–63.6 (luteal) nmol/L
Prolactin	PRL	Male 4–15; Female 4–23 ng/mL	Male 86–324; Female 86–496 mIU/L
Protein C Activity	—	70–140 %	70–140 %
Protein S Activity	—	60–140 %	60–140 %
Prothrombin Time	PT	11.0–13.5 sec	11.0–13.5 sec

Please note: Reference ranges vary between laboratories, and between the methods and instruments they use — the range printed on your own report is the one your result should be compared with. A result outside the range is not by itself a diagnosis, and a result inside it does not rule out illness. These pages are an educational summary, not medical advice: always discuss your results with the clinician who ordered them, who can interpret them in the context of your health and history.

Lab Tests Beginning With P

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