Lab Tests Beginning With R

7 tests in the Lab Values reference begin with the letter R. 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)
Random Glucose	—	70–140 mg/dL	3.9–7.8 mmol/L
Red Blood Cell Count	RBC	Male 4.5–5.9; Female 4.1–5.1 ×10⁶/µL	Male 4.5–5.9; Female 4.1–5.1 ×10¹²/L
Red Cell Distribution Width	RDW	11.5–14.5 %	11.5–14.5 %
Renin, Plasma Renin Activity	PRA	0.5–4.0 ng/mL/h	0.5–4.0 ng/mL/h
Reticulocyte Count	—	0.5–2.5 %	0.5–2.5 %
Reverse T3	rT3	10–24 ng/dL	0.15–0.37 nmol/L
Rheumatoid Factor	RF	<14 IU/mL	<14 IU/mL

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 R

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