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Lab Tests Beginning With O
3 tests in the Lab Values reference begin with the letter O. 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) |
|---|---|---|---|
| Oral Glucose Tolerance Test, 2-Hour Glucose | OGTT | <140 mg/dL | <7.8 mmol/L |
| Osmolality, Serum | — | 275–295 mOsm/kg | 275–295 mmol/kg |
| Oxygen Saturation, Arterial | SaO2 | 95–100 % | 95–100 % |
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.